---
title: "Hastelloy C276 / Alloy C-276 / UNS N10276 Forging Parts"
description: "Hastelloy C276 and Alloy C-276 are the same alloy. Chemistry, mechanical and physical properties, corrosion data, NACE MR0175 status, forging and heat-treatment practice, and ordering specification for Alloy C-276 (UNS N10276 / W.Nr. 2.4819) forgings."
canonical: "https://www.steelforgepieces.com/Nickel-Alloy/Alloy-C-276.html"
manufacturer: "Jiangyin Jiangnan Metal Co., Ltd."
address: "No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China"
telephone: "+86-189-2135-9659"
email: "sales@steelforgepieces.com"
alsoKnownAs: ["Hastelloy C276", "Hastelloy C-276", "Alloy C-276", "UNS N10276", "W.Nr. 2.4819", "NiMo16Cr15W", "NS334", "ERNiCrMo-4"]
standards: ["ASTM B564", "ASME SB-564", "ASTM B574", "W.Nr. 2.4819", "NACE MR0175 / ISO 15156-3", "EN 10204 3.1 / 3.2"]
published: "2022-05-12"
updated: "2026-08-15"
---


# Hastelloy C276 / Alloy C-276 / UNS N10276 Forging Parts

**Jiangyin Jiangnan Metal Co., Ltd.** is an independent open-die forging factory in
Jiangyin, Jiangsu Province, China, producing forgings in the alloy that drawings call **Hastelloy® C276**, **Alloy C-276** or **UNS N10276 / W.Nr. 2.4819 / NiMo16Cr15W**. These are different names for one chemistry, and we certify it to ASTM B564 and ASME SB-564. Our specialty in this grade is large seamless rolled rings, tube sheets and
valve bodies for flue-gas desulphurisation, chemical process, pulp bleaching and sour-gas service. Available shapes
include **seamless rolled rings to 2,500 mm OD**, **forged discs to Ø1,800 mm**,
**forged shafts to 8 m length**, forged flanges, tube sheets, bushings, sleeves and round bar from
Ø25–500 mm, with single-piece weights up to **8,000 kg**. Every piece is solution annealed at
1121 °C minimum with rapid quench and supplied with an EN 10204 3.1 certificate. Third-party witnessed 3.2 certification is available on request.

**Trademark notice:** **Hastelloy®**, **C-22®**, **C-2000®** and **B-3®** are registered trademarks of **Haynes International, Inc.** **Inconel®**, **Incoloy®**
and **Monel®** are registered trademarks of Special Metals Corporation. **Nicrofer®** and
**Alloy 59** are associated with VDM Metals. Hastelloy® C-276 material made and sold by Haynes International is theirs. We use the name only to identify the alloy grade a buyer is asking for, which is the same low-carbon Ni-Mo-Cr-W chemistry defined generically as **UNS N10276 / ASTM B564 / W.Nr. 2.4819 / NiMo16Cr15W**. That generic grade is what Jiangyin Jiangnan Metal Co., Ltd. manufactures and certifies. We are not affiliated
with, sponsored by, or endorsed by any of the trademark holders listed above. All other product names, brand names and
trademarks referenced are the property of their respective owners.

### Multi-Standard Designation Lookup

*Interactive tool: https://www.steelforgepieces.com/Nickel-Alloy/Alloy-C-276.html#tool-lookup*

Type any name a drawing or enquiry might use (Hastelloy C276, C-276, C276, N10276, 2.4819, NiMo16Cr15W, NS334, ERNiCrMo-4) and see every equivalent at once.

Hastelloy® C276, Alloy C-276, UNS N10276 and W.Nr. 2.4819 all describe the same low-carbon Ni-Mo-Cr-W chemistry, and every designation recognised by this tool refers to it. Jiangyin Jiangnan Metal Co., Ltd. ships UNS N10276 / ASTM B564 forgings with a multi-designation material test certificate at no extra cost.

## What forged products are available in Hastelloy C276 / Alloy C-276?

Jiangyin Jiangnan Metal manufactures Alloy C-276 forgings through three routes, chosen by geometry and quantity.
**Open-die forging** covers shafts, blocks, tube sheets and large discs up to 8 m length or 8 tonnes
single-piece weight. **Seamless ring rolling** produces C-276 rings from 200 mm to 2,500 mm outside diameter. This is the dominant route for scrubber shell flanges, pressure-housing rings and heat-exchanger tube-sheet blanks.
**Upset forging** is used for short, large-cross-section hubs and valve bodies. Because C-276 billet is
roughly ten times the cost of carbon steel per kilogram, **near-net-shape forging matters far more in this grade
than in steel**: eliminating 30–50 % of the machining stock on a valve body or a tube sheet often saves more
than the entire forging conversion cost. For hollow shafts and nozzles with a bore above roughly 100 mm we
recommend a trepanned billet, which typically removes 40–60 % of the input weight, and in C-276 the trepanned core is recoverable scrap with real value.

- Seamless rolled rings
- Forged flanges (ASME B16.5 / B16.47)
- Tube sheets & baffles
- Forged discs & blanks
- Valve bodies, bonnets & stems
- Pump shafts & sleeves
- Bushings & bearing sleeves
- Nozzles & forged pipe
- Round bar Ø25–500 mm
- Forged blocks
- Agitator & mixer shafts
- Custom near-net forgings to drawing

**Table 1. Representative Alloy C-276 forgings produced at Jiangyin Jiangnan Metal**

| Part | Size | Condition | Application |
|---|---|---|---|
| Seamless rolled ring | OD 900 mm × wall 90 mm | Solution annealed | FGD absorber shell flange |
| Tube-sheet blank | Ø1,200 mm × 140 mm thick | Solution annealed, UT to ASTM A388 before drilling | Shell-and-tube heat exchanger |
| Valve body | Near-net-shape to drawing | Solution annealed, NACE MR0175 / ISO 15156-3 statement on the MTC | Sour gas wellhead |
| Agitator shaft | Ø160 mm × 3.5 m | Solution annealed, rough machined | Chlorinated organics reactor |

## What is Hastelloy C276 / Alloy C-276 (UNS N10276)?

**Alloy C-276 is a low-carbon nickel-molybdenum-chromium alloy with a tungsten addition**, nominally
57 % Ni – 16 % Mo – 15.5 % Cr – 3.75 % W – 5.5 % Fe. It is the most widely used of the Ni-Cr-Mo
"C-family" alloys and is generally regarded as the most universally corrosion-resistant alloy in commercial production:
it resists both *reducing* media (hydrochloric acid, dilute sulfuric acid, hydrofluoric acid, formic and acetic
acid) and *oxidising* media (wet chlorine, hypochlorite, ferric and cupric chlorides), which very few single
alloys do.

Three composition decisions define the alloy. **Molybdenum plus tungsten**, roughly 20 % combined, provide resistance to reducing acids and to chloride pitting and crevice attack. **Chromium** at 15.5 %
provides resistance to oxidising conditions. And the **extra-low carbon (0.010 % max) and silicon (0.08 % max) limits**, the "276" of the name and the improvement over the original Alloy C, suppress grain-boundary carbide precipitation in the heat-affected zone, which is why C-276 can normally be used in the
*as-welded* condition without a post-weld solution anneal.

C-276 is a **solid-solution alloy with no precipitation-hardening mechanism**. It is supplied solution
annealed; strength can only be raised by cold work, never by ageing. It is austenitic (face-centred cubic),
essentially non-magnetic, and immune to chloride stress-corrosion cracking in the environments that crack austenitic
stainless steels. Its practical weakness is temperature: prolonged exposure between roughly **650 °C and
1090 °C** precipitates μ and P intermetallic phases plus M₆C carbides at the grain boundaries, which
embrittles the alloy and destroys its corrosion resistance. That single fact drives almost every manufacturing rule on this page: the forging schedule, the mandatory post-forge solution anneal, the quench rate, the interpass temperature
limit during welding, and the 400 °C ceiling for wet-corrosion service.

A large number of websites, including older versions of this one, state that C-276 forgings can be given
"solution treatment and ageing treatment together". **This is wrong.** UNS N10276 contains no
precipitation-hardening elements and cannot be aged; any ageing cycle sits inside the μ/P-phase precipitation window and
will sensitise the part. The only correct heat treatment for Alloy C-276 is **solution annealing at 1121 °C
(2050 °F) minimum followed by rapid quenching**. If a purchase specification you have received calls for
ageing on C-276, raise it with the specifier before the order is placed.

## Hastelloy C276, Alloy C-276, UNS N10276 or 2.4819: which name should you use?

Engineers meet this alloy under at least a dozen names. Every designation in the table below refers to the
**same chemistry**, and Jiangyin Jiangnan Metal Co., Ltd. accepts purchase orders under all of them,
supplying UNS N10276 / ASTM B564 forgings certified against the equivalent specification named on the order.

**Table 2. Alloy C-276 / UNS N10276 equivalent designations and product-form standards**

| Standard / body | Designation | Product form / notes |
|---|---|---|
| USA · brand | Hastelloy® C-276 | Registered trademark of Haynes International, Inc., and the name most buyers search for and write on enquiries. We quote against it and supply the identical generic grade certified as UNS N10276 / ASTM B564. |
| USA · UNS | UNS N10276 | Generic Unified Numbering System designation. The correct name for a purchase order |
| USA · ASTM (forgings) | ASTM B564 | **Nickel alloy forgings**. The governing spec for our products |
| USA · ASME BPVC | ASME SB-564 | Code equivalent for pressure-vessel and boiler work |
| USA · ASTM (bar) | ASTM B574 | Rod, bar and wire |
| USA · ASTM (plate) | ASTM B575 | Plate, sheet and strip |
| USA · ASTM (pipe/tube) | ASTM B622 / B619 / B626 | Seamless pipe and tube / welded pipe / welded tube |
| USA · ASTM (fittings) | ASTM B366 | Factory-made wrought fittings |
| EU · Werkstoff | 2.4819 | German material number, used across EN and DIN documentation |
| EU · EN name | NiMo16Cr15W | EN chemical-symbol designation; VdTÜV Werkstoffblatt 400 |
| EU · DIN (legacy) | DIN 17744 / 17750–17754 | Legacy German product standards for Ni-Mo-Cr wrought products |
| China · GB | NS334 / NS3304 | Chinese national designation for the same Ni-Mo-Cr-W chemistry |
| ISO | NW 0276 / NiMo16Cr15W | ISO 6208 / ISO 9722 designations |
| Welding consumable | ERNiCrMo-4 / ENiCrMo-4 | AWS A5.14 bare wire / A5.11 covered electrode. Matching filler for C-276 |

## What is the chemical composition of Hastelloy C276 / Alloy C-276?

The composition below is per **ASTM B564 / ASTM B574 for UNS N10276** and is identical across the plate,
bar, pipe and forging specifications. Note how tight the carbon and silicon ceilings are. These two limits are the whole reason C-276 exists as a separate grade from the earlier Alloy C, and they are the first thing to check on an
incoming mill certificate.

**Table 3. Alloy C-276 / UNS N10276 chemical composition, weight % (ASTM B564 / B574)**

| Element | Min | Max | Typical | Metallurgical role |
|---|---|---|---|---|
| Nickel (Ni) | Remainder | — | ~57 | Austenitic matrix; general corrosion resistance and immunity to chloride SCC |
| Molybdenum (Mo) | 15.0 | 17.0 | 16.0 | Primary resistance to reducing acids, pitting and crevice corrosion |
| Chromium (Cr) | 14.5 | 16.5 | 15.5 | Resistance to oxidising media; passive-film former |
| Iron (Fe) | 4.0 | 7.0 | 5.5 | Solid-solution element; economic diluent |
| Tungsten (W) | 3.0 | 4.5 | 3.75 | Reinforces the Mo effect; adds roughly 6 points of PREN |
| Cobalt (Co) | — | 2.5 | <1.0 | Residual; often capped at 0.2 % for nuclear service |
| Manganese (Mn) | — | 1.0 | 0.5 | Deoxidiser and sulfur getter |
| Vanadium (V) | — | 0.35 | <0.2 | Residual from raw materials |
| Carbon (C) | — | **0.010** | 0.005 | **Critical.** Suppresses grain-boundary carbides, so the alloy can be used as-welded |
| Silicon (Si) | — | **0.08** | 0.04 | **Critical.** High Si accelerates μ-phase precipitation in the HAZ |
| Phosphorus (P) | — | 0.040 | 0.010 | Impurity; grain-boundary embrittler |
| Sulfur (S) | — | 0.030 | 0.002 | Impurity; hot-shortness during forging |

Carbon ≤ 0.010 % and silicon ≤ 0.08 %. Material that is out on either of these is not C-276. It is closer to the obsolete Alloy C, and it will sensitise in the weld heat-affected zone. We also check that
**Mo + 0.5 W** lands in the upper half of the band when the duty is hydrochloric acid, and
that cobalt is reported at all, because nuclear buyers frequently impose a 0.20 % Co cap that the base
specification does not.

## What are the mechanical properties of Hastelloy C276 forgings?

Alloy C-276 is supplied in one condition, **solution annealed**. There are no H-conditions, no temper
designations and no ageing options. The table below gives the ASTM B564 / ASME SB-564 minimum acceptance values that
appear on the certificate, alongside the values we typically measure on annealed forgings.

**Table 4. Alloy C-276 / UNS N10276 mechanical properties, solution annealed**

| Property | ASTM B564 minimum | Typical measured | Test method |
|---|---|---|---|
| Tensile strength | 690 MPa (100 ksi) | 760–830 MPa (110–120 ksi) | ASTM E8 / ISO 6892-1 |
| Yield strength, 0.2 % offset | 283 MPa (41 ksi) | 355–420 MPa (51–61 ksi) | ASTM E8 / ISO 6892-1 |
| Elongation in 2 in / 4D | 40 % | 50–62 % | ASTM E8 |
| Reduction of area | not specified | 55–70 % | ASTM E8 |
| Hardness | ≤ 100 HRB typical requirement | 85–95 HRB (≈ 185–210 HBW) | ASTM E18 / E10 |
| Charpy V impact, room temp. | not specified | 190–290 J | ASTM E23 (buyer option) |
| Charpy V impact, −196 °C | not specified | 150–230 J | ASTM E23 (cryogenic option) |
| Grain size | buyer option | ASTM 4–7 | ASTM E112 |

At 283 MPa minimum yield, C-276 has *less* than half the yield strength of a 17-4PH forging and roughly the
same yield as annealed 316L. It is specified for what it survives, not for what it carries. If a design needs both
corrosion resistance and high strength, the usual answers are [Inconel 718](https://www.steelforgepieces.com/Nickel-Alloy/Inconel-718.html)
(age-hardened, ~1,030 MPa yield) or [Alloy 925](https://www.steelforgepieces.com/Nickel-Alloy/Incoloy-925.html),
or a C-276 clad or weld-overlaid steel component. Cold work does raise C-276 strength substantially, but it also moves
the part out of ISO 15156-3 Table A.13 and into the more restrictive Table A.14 for sour service.

Elevated-temperature strength falls steadily and is only relevant for dry service, since wet-corrosion duty is capped
near 400 °C regardless:

**Table 4b. Typical elevated-temperature tensile properties, solution-annealed UNS N10276**

| Temperature | Tensile, typ. | Yield 0.2 %, typ. | Elongation, typ. |
|---|---|---|---|
| 21 °C (70 °F) | 790 MPa | 380 MPa | 60 % |
| 200 °C (390 °F) | 705 MPa | 300 MPa | 62 % |
| 400 °C (750 °F) | 655 MPa | 255 MPa | 64 % |
| 600 °C (1110 °F) | 620 MPa | 235 MPa | 60 % |
| 800 °C (1470 °F) | 400 MPa | 215 MPa | 55 % |

## What is the density of Alloy C-276, and its other physical properties?

**Table 5. Alloy C-276 / UNS N10276 physical properties, solution annealed**

| Property | Value | Imperial | Note |
|---|---|---|---|
| Density | 8.89 g/cm³ | 0.321 lb/in³ | ≈ 11 % heavier than 316L (7.98) |
| Melting range | 1325–1370 °C | 2415–2500 °F | Solidus / liquidus |
| Modulus of elasticity | 205 GPa | 29.8 × 10⁶ psi | Room temperature |
| Shear modulus | 79 GPa | 11.5 × 10⁶ psi | Room temperature |
| Poisson's ratio | 0.31 | — | Room temperature |
| Thermal conductivity | 10.2 W/m·K | 71 Btu·in/h·ft²·°F | Low, about 2/3 of 316L; drives welding heat input |
| Coefficient of thermal expansion | 11.2 × 10⁻⁶ /°C (20–100 °C) | 6.2 × 10⁻⁶ /°F | 12.6 × 10⁻⁶ /°C at 20–500 °C |
| Specific heat | 427 J/kg·K | 0.102 Btu/lb·°F | Room temperature |
| Electrical resistivity | 1.30 µΩ·m | 130 µΩ·cm | High; relevant to resistance welding |
| Magnetic permeability | 1.0002 | — | Essentially non-magnetic (FCC austenitic) |
| Curie temperature | < −73 °C | < −100 °F | No ferromagnetic behaviour in service |

**Thermal conductivity is only 10.2 W/m·K**, about one third that of carbon steel. Heat generated at
the cutting edge does not run away into the workpiece; it stays in the tool. That, plus rapid work hardening, is why
C-276 machines at roughly a quarter of the speed of 316L and needs flood coolant. In welding, the same low
conductivity means heat accumulates in the joint, so interpass temperature control matters more than in steel.

## How corrosion-resistant is Hastelloy C276 in acids, chlorides and seawater?

Alloy C-276 is specified when no stainless grade will survive. Its distinguishing feature is that it performs in
**both reducing and oxidising conditions**, and, critically for real plants, in streams that swing
between the two, or that are contaminated in ways nobody predicted at the design stage. Typical performance:

**Table 6. Alloy C-276 corrosion performance in common process media (indicative; verify against your actual stream)**

| Medium | C-276 performance | Practical limit | Better choice if exceeded |
|---|---|---|---|
| Hydrochloric acid (HCl) | Excellent across all concentrations at moderate temperature | ≈ 10 % at 50 °C for <0.13 mm/y | Alloy B-3 (N10675) if no oxidisers present |
| Sulfuric acid (H₂SO₄) | Excellent dilute and very concentrated; weakest at mid concentration | <10 % to 65 °C; >80 % to 50 °C | Alloy B-3, or 904L / Alloy 20 for economy |
| Hydrofluoric acid (HF) | Very good, one of the few options | to ~50 % below 65 °C | Monel 400 for aerated HF |
| Phosphoric acid | Excellent including wet-process acid with fluorides | to boiling in most concentrations | — |
| Formic / acetic acid | Excellent to boiling, including with halide contamination | no practical limit | — |
| Wet chlorine, hypochlorite | Excellent. A signature C-276 duty | to ~80 °C in bleach | Titanium for pure oxidising chloride |
| Ferric / cupric chloride | Excellent. Resists these classic pitting agents | to ~100 °C | Alloy C-22 / Alloy 59 |
| Seawater, brine, chlorides | Excellent. No chloride SCC, CPT > 100 °C | crevice corrosion resistant to ~85 °C | — |
| Sour gas (H₂S + CO₂ + Cl⁻) | Excellent. ISO 15156-3 Table A.13 type 4b | solution annealed, ≤35 HRC typical | — |
| FGD scrubber condensate | Excellent. The industry benchmark alloy | low pH + chloride + fluoride tolerated | Alloy 59 for the most severe zones |
| Nitric acid (HNO₃) | Limited. Strongly oxidising, Mo is a liability | avoid above ~40 % or elevated temp. | Alloy 690, 304L or Alloy 33 |
| Nitric + HF mixed acid | Marginal. Pickling duty attacks C-276 | short exposure only | Zirconium or Alloy 33 |
| Molten salts, sulfidising gas | Not suitable above ~650 °C | intermetallic precipitation | Alloy 230, Alloy 600, Alloy 617 |

### Standard laboratory acceptance tests

Three tests appear on most C-276 purchase specifications. Ask for them by name and by acceptance criterion, not just
by number:

#### Boiling ferric sulfate – 50 % H₂SO₄

24-hour immersion. The standard proof that the solution anneal was effective and no intermetallic phase is present. Typical acceptance for C-276 is **≤ 1.0 mm/y**; a properly annealed forging usually reports 0.2–0.6 mm/y.

#### Mixed acid + ferric chloride ("green death")

More severe; detects localised attack that Method A misses. Used where the buyer needs proof of resistance to mixed oxidising chloride streams. Report as mm/y plus visual assessment for pitting.

#### Ferric chloride pitting & crevice

Determines critical pitting temperature (CPT) and critical crevice temperature (CCT). C-276 typically shows **CPT > 100 °C** and **CCT ≈ 80–85 °C**, far above 6 % Mo superaustenitics.

**Table 6b. Localised corrosion resistance benchmarks (ASTM G48, 6 % FeCl₃)**

| Alloy | PREN | CPT, °C | CCT, °C | Comment |
|---|---|---|---|---|
| 316L (S31603) | 25 | ~20 | <10 | Pits readily in seawater |
| 904L (N08904) | 35 | ~45 | ~25 | Sulfuric-acid workhorse |
| 2507 super duplex | 42 | ~55 | ~35 | Strong but chloride-SCC limited |
| 6 % Mo (S31254 / N08367) | 44 | ~70 | ~45 | Common seawater choice |
| Alloy 625 (N06625) | 51 | ~85 | ~60 | Strength plus resistance |
| **Alloy C-276 (N10276)** | **~74** | **>100** | **~85** | Reducing-acid champion |
| Alloy C-22 (N06022) | ~74 | >100 | ~85 | Better in oxidising media |
| Alloy 59 (N06059) | ~76 | >100 | ~90 | Highest of the C-family |

### Corrosion Media Selector

*Interactive tool: https://www.steelforgepieces.com/Nickel-Alloy/Alloy-C-276.html#tool-media*

Describe the stream your part sits in. The tool returns a verdict for Alloy C-276, the expected corrosion regime, and the alloy to use instead when C-276 is the wrong answer.

Screening guidance only, assembled from published isocorrosion diagrams and general industry practice. Real corrosion rates depend on velocity, aeration, trace contaminants, crevice geometry, weld condition and cycling. For a final material decision, run coupon tests in the actual stream or consult a corrosion engineer. Jiangyin Jiangnan Metal Co., Ltd. provides this tool for guidance and accepts no liability for application decisions.

### Isocorrosion Chart for Alloy C-276 in Acids

*Interactive tool: https://www.steelforgepieces.com/Nickel-Alloy/Alloy-C-276.html#tool-iso*

Move the concentration and temperature sliders and read the corrosion regime directly off the chart. The curve is the 0.13 mm/y (5 mpy) isocorrosion line, the usual boundary for "suitable for continuous service".

Curves are digitised approximations of published isocorrosion diagrams for solution-annealed UNS N10276 in de-aerated, reagent-grade acid, and are indicative only. Aeration, oxidising ions such as Fe³⁺ and Cu²⁺, halide contamination, velocity and crevices all shift the boundary, usually unfavourably for reducing acids and favourably for C-276 in mixed oxidising service. Use for screening, not for design life calculations.

### PREN Calculator, with and without the tungsten term

*Interactive tool: https://www.steelforgepieces.com/Nickel-Alloy/Alloy-C-276.html#tool-pren*

Paste the chromium, molybdenum, tungsten and nitrogen figures from your mill certificate to get the pitting resistance equivalent number for that specific heat, benchmarked against the alloys you might otherwise specify.

PRENW = %Cr + 3.3(%Mo + 0.5 %W) + 16 %N is the tungsten-corrected form used for Ni-Cr-Mo-W alloys; the classical PREN₁₆ = %Cr + 3.3 %Mo + 16 %N omits tungsten and under-reports C-276 by about six points. PREN ranks resistance to chloride pitting only. It says nothing about resistance to reducing acids, stress-corrosion cracking or intergranular attack, and it must never be used alone to substitute one alloy for another.

## Why does Alloy C-276 have to be solution annealed? Intermetallic phases explained

This is the single most important process fact about the alloy, and the reason a C-276 forging costs more to make
than its weight of metal suggests. Between roughly **650 °C and 1090 °C** the alloy is thermodynamically
unstable: μ phase (a topologically close-packed Ni-Mo-W compound), P phase and M₆C carbides nucleate on the grain
boundaries. Three things happen when they do.

1. **Chromium and molybdenum are stripped from the zone next to the grain boundary.** That depleted zone has the corrosion resistance of a much leaner alloy and dissolves preferentially, which is classic intergranular attack.
2. **Ductility and impact toughness fall.** Heavily precipitated C-276 can lose the majority of its room-temperature impact energy.
3. **The damage is invisible.** Dimensions, hardness and tensile results can all still pass. The only reliable detection is ASTM G28 Method A corrosion testing or metallography.

**Table 7. Time-temperature behaviour of Alloy C-276 (indicative; heat chemistry shifts the curve)**

| Temperature | What forms | Onset time (approx.) | Consequence |
|---|---|---|---|
| < 600 °C | Nothing significant | years | Safe for continuous service |
| 650 °C | M₆C carbide, early μ | 50–200 h | Slow sensitisation. Avoid long holds |
| 760 °C | μ phase + P phase | 1–5 h | Rapid. Never stress-relieve here |
| 870 °C | μ phase, peak kinetics | 10–60 min | Fastest precipitation |
| 980 °C | μ phase, decreasing | 1–4 h | Still a risk on slow cooling |
| 1090 °C | Phases begin to dissolve | — | Transition |
| ≥ 1121 °C | Full solution | ≈ 30 min per 25 mm | Correct anneal. Then quench fast |

**1. Slow cooling after forging or annealing.** Air cooling a 200 mm section from 1121 °C takes it
through the precipitation window slowly enough to sensitise the core. Water quench, or a forced-gas quench for
distortion-sensitive geometry.

**2. Post-weld stress relief.** A steel fabricator's instinct is to stress-relieve at 600–700 °C. On
C-276 that is a sensitisation cycle. C-276 weldments are normally used as-welded; if stress relief is genuinely
required, the only correct cycle is a full solution anneal at 1121 °C with rapid quench.

**3. Flame cutting, uncontrolled preheat and hot straightening.** Any operation that parks the metal in
the 650–1090 °C band for tens of minutes does the same damage as a deliberate ageing treatment.

### Sensitisation & Intermetallic Phase Risk Simulator

*Interactive tool: https://www.steelforgepieces.com/Nickel-Alloy/Alloy-C-276.html#tool-ttt*

Enter any thermal exposure your C-276 part has seen or will see (a stress relief, a slow cool, a hot forming pass, a service excursion) and get the precipitation risk, the likely property loss and the corrective action.

Model built from published time-temperature-precipitation behaviour for UNS N10276 and the general kinetics of μ / P / M₆C formation in Ni-Mo-Cr-W alloys. Real onset times shift with silicon and carbon content within the specification band, prior cold work, grain size and section thickness. Treat the output as a risk flag that triggers ASTM G28 Method A testing or metallography, not as a substitute for either.

## Is Hastelloy C276 approved for NACE MR0175 / ISO 15156 sour service?

Yes, and with an unusually generous envelope. In the **solution-annealed condition** UNS N10276 is
listed in **ISO 15156-3 Table A.13 as materials type 4b**, the group of solid-solution nickel-based alloys
accepted for sour production environments without the temperature, H₂S partial-pressure and chloride restrictions that
apply to leaner alloys. Most purchase specifications add a hardness cap of **35 HRC**, which a properly
annealed forging clears comfortably at 85–95 HRB (roughly 5–15 HRC).

**Cold-worked** C-276 is a different case: it moves to **Table A.14 as materials type 4e**,
with a 40 HRC maximum and defined environmental limits, plus a further hardness restriction where the minimum service
temperature is 121 °C or above. This is the trap in specifying cold-drawn C-276 bar for a sour-service valve stem. The material is the same; the NACE table is not.

Heat number and full chemistry; solution-annealing chart record showing temperature, hold and quench; tensile and
hardness results with the hardness test locations identified; ASTM G28 Method A result where specified; and an explicit
statement of the ISO 15156-3 table, materials type and edition against which compliance is claimed. Naming the edition matters. ISO 15156-3 has been revised repeatedly, most recently in the 2020 fourth edition, and a compliance statement
without an edition reference is not auditable.

### NACE MR0175 / ISO 15156-3 Compliance Checker

*Interactive tool: https://www.steelforgepieces.com/Nickel-Alloy/Alloy-C-276.html#tool-nace*

Enter the delivery condition and the well conditions to get a first-pass verdict on C-276 for sour service, plus the exact wording to put on the purchase order.

First-pass screening tool based on the structure of NACE MR0175 / ISO 15156-3 Tables A.13 and A.14 for solid-solution nickel-based alloys. Final material acceptance requires review by a qualified materials engineer against the edition of the standard in force at the contract date, and may require project-specific qualification testing. Jiangyin Jiangnan Metal Co., Ltd. provides this tool for guidance and is not liable for application decisions.

## Hastelloy C276 vs C-22 vs C-2000 vs Alloy 59 vs 625 vs 825: which one do you need?

The C-family alloys are close cousins, and the wrong pick is expensive in both directions: over-specify and you pay
two to three times the material cost for nothing; under-specify and you replace the equipment. The single most useful
question is whether your stream is **reducing** (acids without oxidisers, which is C-276 territory) or **oxidising** (ferric ions, nitric acid, aerated bleach, where higher chromium wins).

**Table 8. Alloy C-276 compared with the alloys most often considered alongside it**

| Property | C-276 N10276 | C-22 N06022 | Alloy 59 N06059 | Alloy 625 N06625 | Alloy 825 N08825 | 904L N08904 |
|---|---|---|---|---|---|---|
| Ni / Cr / Mo, % | 57/15.5/16 | 56/22/13 | 59/23/16 | 61/21.5/9 | 42/21.5/3 | 25/20/4.5 |
| Tungsten, % | 3.75 | 3.0 | — | — | — | — |
| PREN (W-corrected) | **~74** | ~74 | ~76 | ~51 | ~31 | ~35 |
| Yield min, MPa | 283 | 310 | 310 | 414 | 241 | 220 |
| Reducing acids (HCl, H₂SO₄) | Excellent | Very good | Very good | Moderate | Limited | Moderate |
| Oxidising media (HNO₃, Fe³⁺) | Moderate | Excellent | Excellent | Good | Good | Good |
| Chloride pitting / crevice | Excellent | Excellent | Excellent | Very good | Moderate | Moderate |
| Tolerance of welding heat | Moderate | Better | Best | Good | Good | Good |
| High-temp. strength | Low | Low | Low | High | Moderate | Low |
| Relative material cost | 9–11 × | 9–11 × | 10–12 × | 7–9 × | 4–5 × | 2.5–3 × |
| **Pick it when…** | **Reducing acids, mixed or unpredictable streams, HCl / HF, FGD** | Oxidising or swinging redox, heavy weld fabrication | Most severe FGD and mixed acid; best weld tolerance | Strength plus corrosion, seawater, sour gas, high temperature | Sulfuric acid and sour gas at lower cost | Sulfuric acid, phosphoric acid, economical upgrade from 316L |

**Reducing service → C-276. Oxidising service → C-22 or Alloy 59. Strength needed → Alloy 625.
Budget-constrained sulfuric duty → 904L or Alloy 825.** If the stream genuinely swings between reducing and
oxidising, or nobody can tell you what is in it, C-276 remains the safest single answer, which is exactly why it has been the default "when in doubt" alloy of the chemical process industry for six decades.

### Material Substitution Finder: should you move to C-276?

*Interactive tool: https://www.steelforgepieces.com/Nickel-Alloy/Alloy-C-276.html#tool-sub*

Tell the tool what you use now and why you are unhappy with it. It returns whether Alloy C-276 is the right upgrade, what you gain, what you give up, and what to watch on the drawing.

Substitution guidance based on published typical properties and general practice. Final substitution decisions must be made by a qualified materials engineer taking account of the actual stream chemistry, mechanical loads, code requirements, joinability, galvanic pairing and supply chain.

## Alloy C-276 failure modes and how to prevent them

C-276 rarely fails through general corrosion. When a C-276 component does fail, the root cause is nearly always a
processing or specification error rather than an inadequate alloy. These are the patterns we and our customers see most
often.

#### Intergranular attack from sensitisation

**Root cause**
: Exposure to 650–1090 °C: slow cooling after forging, an unwise post-weld stress relief, or flame cutting. μ / P phase and M₆C carbides deplete the grain boundaries of Cr and Mo.

**Detection**
: ASTM G28 Method A corrosion rate above the acceptance limit; metallography showing grain-boundary precipitate; in service, grain dropping and a sugary fracture surface.

**Prevention**
: Solution anneal at 1121 °C minimum with rapid quench after every hot operation. Never stress-relieve C-276. Specify G28 Method A on the order.

#### Crevice corrosion under gaskets and deposits

**Root cause**
: Even at CCT ≈ 85 °C, a tight crevice with hot concentrated chloride and a low-pH pocket will eventually initiate attack. Deposits and biofilms create the same geometry.

**Detection**
: Localised attack confined to the gasket seat or lap joint; often found at the first shutdown inspection.

**Prevention**
: Design out crevices. Use full-penetration welds instead of lap joints, radiused corners, flush gasket seating. Keep surfaces clean; specify Ra ≤ 1.6 µm on wetted faces.

#### Iron contamination and rouging

**Root cause**
: Grinding with wheels previously used on carbon steel, carbon-steel slings, mild-steel layout tables or shot blast media. Embedded iron rusts and initiates pitting on an otherwise sound surface.

**Detection**
: Rust spotting on a nickel alloy surface after a water test; ferroxyl test positive.

**Prevention**
: Dedicated non-ferrous tooling, stainless or nylon slings, segregated storage. Pickle and passivate before shipment where the buyer requires it.

#### Hot cracking during welding

**Root cause**
: Excessive heat input, wide weaving, high interpass temperature or heavy restraint. C-276 has a wide solidification range and low thermal conductivity, so the weld pool stays molten longer than a welder used to steel expects.

**Detection**
: Centreline cracks on PT; crater cracks at stops.

**Prevention**
: Stringer beads, interpass temperature below ~100 °C, matching ERNiCrMo-4 filler, no autogenous welds on thick section, back-purge with argon.

#### Work-hardening and tool failure in machining

**Root cause**
: Dwelling, rubbing or light feeds. The surface work-hardens instantly and the next pass runs in hardened material, which destroys the edge and glazes the surface.

**Detection**
: Rapid flank wear, poor surface finish, dimensional drift.

**Prevention**
: Positive, uninterrupted feed; sharp rigid carbide; slow speed, heavy feed; flood coolant. Never let the tool sit in the cut.

#### Wrong alloy in oxidising duty

**Root cause**
: C-276 specified for nitric acid or a strongly oxidising nitric-HF pickling line. The high molybdenum that makes the alloy so good in HCl is a liability where the oxidising potential is high.

**Detection**
: Uniform wall loss far above expectation; bright, etched appearance.

**Prevention**
: Use the corrosion media selector above. For nitric duty, specify Alloy 690, 304L or Alloy 33; for nitric-HF, zirconium.

#### Galvanic acceleration of the attached steel

**Root cause**
: C-276 is very noble. Coupled to carbon steel or 316L in an electrolyte, the *other* metal corrodes rapidly, and an unfavourable area ratio (large C-276, small steel) makes it dramatic.

**Detection**
: Rapid wastage of bolting, small fittings or the steel side of a transition joint.

**Prevention**
: Insulating gaskets and sleeves at transitions; match bolting material to the noble side; never use small carbon-steel fasteners in a large C-276 assembly.

#### Forging bursts and laps

**Root cause**
: Finishing below ~950 °C, or excessive reduction per pass. C-276 work-hardens fast and has a narrow hot-working window, so a schedule copied from steel practice cracks it.

**Detection**
: Ultrasonic indications; linear lap indications on PT after machining exposes them.

**Prevention**
: Start 1180–1230 °C, finish above 950 °C, reheat frequently, moderate reduction per pass, UT to ASTM A388 or EN 10228-3 after annealing.

## Worked design examples with Alloy C-276

Three short calculations showing how the data above feeds real decisions. They are simplified for clarity;
production designs need code verification.

#### Example 1. Wall thickness of an FGD absorber nozzle from corrosion allowance

**Given:** nozzle inside diameter 400 mm, design pressure 0.6 MPa, design life 20 years, medium is FGD scrubber
condensate at 60 °C. Measured coupon rate for C-276 in this service: 0.02 mm/y. Allowable stress for UNS N10276 at
60 °C, taken conservatively from the ASME SB-564 basis: 165 MPa. Joint efficiency E = 1.0 (seamless forged).

**Pressure thickness** (thin-wall formula, ASME VIII-1 UG-27): t = PR / (SE − 0.6P) =
(0.6 × 200) / (165 × 1.0 − 0.6 × 0.6) = 120 / 164.6 = **0.73 mm**.

**Corrosion allowance:** 0.02 mm/y × 20 y = 0.40 mm.

**Total required:** 0.73 + 0.40 = 1.13 mm, before mill tolerance and handling stiffness.

**Verdict:** the wall is governed by handling, fabrication and nozzle-reinforcement rules, not by corrosion or pressure, which is the normal outcome with C-276. The engineering value of the alloy is that the corrosion allowance
is nearly zero, so a thin, light and therefore *affordable* section is legitimate. Compare the same duty in
316L, where a 0.5 mm/y rate would demand a 10 mm corrosion allowance and the part becomes both heavier and
shorter-lived.

#### Example 2. Billet weight and cost driver for a seamless rolled ring

**Given:** finished ring OD 900 mm, ID 720 mm, height 150 mm, in C-276 at 8.89 g/cm³.

**Finished volume:** V = π/4 × (0.9² − 0.72²) × 0.15 = π/4 × (0.81 − 0.5184) × 0.15 = 0.03434 m³ =
34,340 cm³.
**Finished weight:** 34,340 × 8.89 / 1000 = **305 kg**.

**Rough forging weight** at +25 % machining stock: 305 × 1.25 = 381 kg. **Billet weight** with a further
12 % for crop and scale: **≈ 427 kg**.

**Verdict:** 122 kg, or 29 % of the input, is bought at nickel-alloy price and sold as scrap. On a grade costing
roughly ten times carbon steel per kilogram, this is where the money is. Reducing machining stock from 25 % to 12 %
through near-net ring rolling saves about 40 kg of C-276 per ring, which on a 20-ring order usually exceeds the entire
tooling and setup cost. Always ask for the ring to be rolled to a contoured profile if the finished section is not
rectangular.

#### Example 3. Bolt-up load on a C-276 flange, checked against the lower yield strength

**Given:** a designer is converting a 316L flange detail to C-276 and keeping the same bolt torque. C-276 yield
minimum is 283 MPa; 316L is 170 MPa; the flange face bearing area is 12,000 mm² and the total bolt load is 900 kN.

**Bearing stress:** 900,000 / 12,000 = **75 MPa**, or 26 % of the C-276 minimum yield and 44 % of the 316L
minimum. Both pass.

**The real check** is thermal, not mechanical. C-276 expands at 11.2 × 10⁻⁶/°C against 16.0 × 10⁻⁶/°C for 316L.
A bolted joint that mixes the two, or that uses 316L bolting on a C-276 flange, loses gasket load on heat-up because the two sides move differently, roughly 0.5 mm of differential movement per metre per 100 °C.

**Verdict:** the substitution is mechanically fine and the yield strength is actually higher than the 316L it
replaces, but the flange detail must be reviewed for differential expansion, and the bolting material must be chosen
deliberately rather than inherited from the steel drawing.

## How do you forge, heat treat, weld and machine Hastelloy C276?

### Forging

Alloy C-276 forges from a starting temperature of **1180–1230 °C (2150–2250 °F)** with a finishing
temperature no lower than **950 °C (1750 °F)**. The hot-working window is narrow compared with steel and
the alloy work-hardens quickly, so heavy sections are reheated between passes rather than pushed to the last blow.
Reduction ratio of 4:1 or better breaks down the cast structure. Because the alloy is stiff at forging temperature,
press forging is preferred to hammer forging for large sections, and die and tool wear is significantly higher than in
steel work. After the final forging operation, **every piece is solution annealed and quenched**. This is not optional and not a substitute for controlled cooling.

### Heat treatment

The only heat treatment is a solution anneal at **1121 °C (2050 °F) minimum**, held roughly 30 minutes
per 25 mm of section, followed by the fastest quench the geometry tolerates. Water quenching is standard for rings,
discs and bar; forced-gas or polymer quenching is used where distortion or quench cracking is a concern on complex
geometry. Furnace atmosphere should be clean and sulfur-free, because sulfur-bearing fuel gas embrittles nickel alloys, and parts must be free of grease, marking paint and cutting fluid before entering the furnace.

### Welding

C-276 is normally welded with **matching ERNiCrMo-4 filler** (AWS A5.14 bare wire; ENiCrMo-4 covered
electrode per A5.11) by GTAW or GMAW. The essential rules: low heat input, stringer beads rather than weaving,
**interpass temperature below about 100 °C**, argon back-purge on root passes, and no autogenous welding
on thick section. Post-weld heat treatment is normally *not* performed. The extra-low carbon and silicon composition is what buys as-welded service. Where the duty is severe enough that the buyer demands G28 testing on the
weldment, the only correct treatment is a full solution anneal and quench, never a stress relief. Dissimilar joints to
carbon steel or stainless are usually made with ERNiCrMo-3 (Alloy 625 type) filler to accommodate dilution.

### Machining

Expect roughly **20–25 % of the machinability of 316L**. C-276 work-hardens instantly under a rubbing
edge, and its low thermal conductivity keeps the heat in the tool rather than in the chip. The rules are slow speed,
heavy positive feed, sharp rigid tooling with positive rake, generous flood coolant, and above all a continuous cut. Never dwell, and never let the tool spring away and rub. Take a deeper cut than feels comfortable so the edge stays below
the previously work-hardened layer. Use the calculator below for starting parameters.

### Solution Annealing & Forging Recipe Generator

*Interactive tool: https://www.steelforgepieces.com/Nickel-Alloy/Alloy-C-276.html#tool-ht*

Enter the section thickness and geometry to get a complete, printable heat-treatment and forging cycle for Alloy C-276, ready to hand to a heat-treatment subcontractor.

Cycles follow general industry practice for UNS N10276 and the ASTM B564 requirement for solution annealing. Hold times scale at approximately 30 minutes per 25 mm of section above the soak temperature. Furnace uniformity should be verified to ±10 °C and charts retained with the certificate. Always validate the first production part with ASTM G28 Method A testing.

### Machinability Parameter Calculator for C-276

*Interactive tool: https://www.steelforgepieces.com/Nickel-Alloy/Alloy-C-276.html#tool-mach*

Pick the operation and tooling to get starting cutting parameters for solution-annealed Alloy C-276, the values that stop a shop destroying inserts on their first nickel-alloy job.

Starting values only. Final selection depends on machine rigidity, tool holding, overhang and surface-finish requirements. Three rules override every number here: keep the feed positive and continuous, never dwell in the cut, and use flood coolant. C-276 work-hardens under a rubbing edge faster than any stainless steel most shops have machined.

## Hastelloy C276 / UNS N10276 production capability at Jiangyin Jiangnan Metal

Jiangyin Jiangnan Metal Co., Ltd. has produced open-die forgings and seamless rolled rings at No.1 Chengxiqiao Road,
Zhouzhuang Town, Jiangyin City, Jiangsu Province since 2008, and exports to more than 40 countries. Nickel alloys are a
distinct discipline from steel forging: the billet is bought against the order, the forging schedule is tighter, the
anneal is mandatory and the material is far too valuable to scrap. The envelopes below are the tested limits for
UNS N10276 specifically.

### Complete Alloy C-276 forging process flow

### Equipment qualified for nickel-alloy production

#### 40 MN free-die hydraulic press

Max ingot 12 t · max diameter 1,800 mm · max length 8,000 mm. Press forging is preferred over hammer work for C-276 because the alloy is stiff at temperature.

#### 25 MN free-die hydraulic press

Max ingot 6 t. Faster cycle for shafts, bars and blocks, which matters because every reheat costs time in the precipitation window.

#### Radial-axial ring mill

Max OD 2,500 mm · max height 600 mm · min wall 30 mm. Rectangular, contoured and T-section profiles.

#### Bogie-hearth solution furnace

8 × 4 × 2 m chamber, 1,200 °C maximum, ±10 °C uniformity, chart recorded per charge. Clean, sulfur-free atmosphere.

#### Rapid quench tank & gas quench

Water quench for rings, discs and bar; forced-gas quench for distortion-sensitive near-net geometry. Transfer time from furnace to quench is logged.

#### Phased-array ultrasonic

ASTM A388 and EN 10228-3 acceptance classes, automated scan with report. Performed after annealing, not before.

#### Fluorescent penetrant line

ASTM E165 / EN ISO 3452. Magnetic particle testing does not apply to C-276. The alloy is non-magnetic, and a request for MT on a C-276 part is a specification error worth querying.

#### Optical emission spectrometer + PMI

Full elemental analysis calibrated daily against certified reference material, plus handheld XRF positive material identification on every finished piece.

#### ASTM G28 / G48 test cell

Boiling ferric sulfate–sulfuric acid (Method A), mixed-acid Method B, and ferric chloride pitting and crevice testing to G48 Method C / E.

#### 300 kN universal test machine

Tensile per ASTM E8 / ISO 6892-1, Charpy V per ASTM E23 including sub-zero, hardness HRB / HRC / HBW / HV.

#### Microstructure laboratory

Optical to 1000×, grain size per ASTM E112, macroetch per ASTM E381, and grain-boundary precipitate assessment for C-276 anneal verification.

#### Segregated nickel-alloy cell

Dedicated non-ferrous grinding wheels, stainless and nylon slings, separate layout tables and storage racks to prevent iron contamination.

### Delivery performance on Alloy C-276 orders, past 12 months

Percentage of orders shipped within the stated number of weeks, measured from order confirmation to ex-works despatch. Refreshed quarterly.

**Table 9. Alloy C-276 / UNS N10276 delivery statistics**

| Order type | Target | On-time rate |
|---|---|---|
| Bar-derived parts, common diameters | 8 weeks | 88 % |
| Rolled rings and flanges, standard | 10 weeks | 86 % |
| Tube sheets and discs | 12 weeks | 83 % |
| With ASTM G28 Method A testing | 13 weeks | 81 % |
| Large forgings above 3 t | 14 weeks | 76 % |
| EN 10204 3.2 third-party witnessed | 15 weeks | 74 % |

### Alloy C-276 Forging Weight Calculator

*Interactive tool: https://www.steelforgepieces.com/Nickel-Alloy/Alloy-C-276.html#tool-weight*

Pick a shape and dimensions to get the finished weight at 8.89 g/cm³, plus the rough forging and billet weight you will actually be quoted on. Use the result to populate your enquiry.

Calculated at the Alloy C-276 density of 8.89 g/cm³ (0.321 lb/in³). The finished weight is what your drawing defines; the rough forging weight includes machining stock; the billet weight adds a further 12 % for crop, scale and test coupons. Maximum single-piece capability is 8,000 kg. Because C-276 billet is roughly ten times the price of carbon steel per kilogram, reducing the machining stock is usually the largest single lever on the quoted price.

## Which standards and quality systems apply to Alloy C-276 forgings?

The governing specification for our C-276 products is **ASTM B564** for nickel alloy forgings, or its code equivalent **ASME SB-564** for pressure-vessel work. European projects add **W.Nr.
2.4819 / NiMo16Cr15W** and VdTÜV Werkstoffblatt 400; oil and gas adds **NACE MR0175 / ISO
15156-3**. Quality management is certified to **ISO 9001:2015**.

- ASTM B564
- ASME SB-564
- ASTM B574
- ASTM B575
- ASTM B622 / B619 / B626
- ASTM B366
- W.Nr. 2.4819
- NiMo16Cr15W
- VdTÜV 400
- GB NS334
- NACE MR0175 / ISO 15156-3
- EN 10204 3.1
- EN 10204 3.2
- ASTM G28 A & B
- ASTM G48 C & E
- ASTM A388
- EN 10228-3
- ASTM E165
- EN ISO 3452
- ASTM E8 / ISO 6892-1
- ASTM E23
- ASTM E112
- ISO 9001:2015
- PED 2014/68/EU 4.3

### Quality assurance and non-conformance policy

#### Six mandatory hold points

Production cannot proceed past any of these without QA sign-off: (1) billet chemistry verification against the C and Si ceilings, (2) forging temperature compliance, (3) solution-anneal chart and quench-transfer time approval, (4) post-anneal ultrasonic testing, (5) mechanical and corrosion test acceptance, (6) final NDE, PMI and dimensional inspection. Customer-witnessed hold points are added on request at no charge.

#### Non-conformance handling

Any out-of-specification finding raises a formal NCR within 24 hours. Root-cause analysis is completed within five working days. The customer receives the NCR with a proposed disposition (rework, regrade, scrap or use-as-is with concession) before any action is taken. No silent rework, and no re-annealing of a rejected piece without disclosure.

#### Replacement guarantee

Material found non-conforming within six months of delivery, verified by independent third-party test, is replaced free of charge including freight. Production records, heat-treatment charts and shipping documentation are retained for ten years to support warranty and audit claims.

#### Witness inspection right

Customers may witness any production stage: chemistry analysis, forging, solution annealing, quenching, mechanical testing, G28 corrosion testing and final NDE. Third-party witness by Lloyd's Register, DNV, Bureau Veritas, ABS, TÜV or SGS is arranged per order.

## How to specify a Hastelloy C276 / UNS N10276 forging order

1. **Confirm the material designation**Enquiries almost always arrive written as Hastelloy C276, and that is fine at the enquiry stage. On the purchase order itself, add the generic designation: **UNS N10276 / ASTM B564**, or ASME SB-564 for code work, plus W.Nr. 2.4819 / NiMo16Cr15W for European projects. Hastelloy® is a Haynes International trademark, and an order naming only the brand can be read as restricting supply to their material, which narrows your supplier list and your price.
2. **State the delivery condition, and only one is correct**Specify **solution annealed at 1121 °C minimum, rapid quench**. Do not specify ageing, precipitation hardening or stress relief. If a legacy specification you have inherited calls for ageing on C-276, correct it before ordering.
3. **Provide the drawing**2D drawing or 3D model with critical dimensions, tolerances, machining allowance, surface roughness on wetted faces and any grain-flow requirement. Flag every crevice-forming feature so it can be reviewed.
4. **Define the corrosion duty in writing**Medium, concentration, temperature, pH, chloride and fluoride level, H₂S partial pressure and any oxidising contaminants. This determines which corrosion test belongs on the order and whether C-276 is even the right alloy. See the corrosion media selector.
5. **Specify corrosion and NDE testing**Typical set: ASTM G28 Method A with an acceptance limit stated in mm/y; ultrasonic testing to ASTM A388 or EN 10228-3 with the class named; liquid penetrant to ASTM E165 or EN ISO 3452. Do not specify magnetic particle testing, because C-276 is non-magnetic.
6. **Specify certification**EN 10204 3.1 mill certificate as standard, or 3.2 with a named third-party inspection body. For sour service add "NACE MR0175 / ISO 15156-3 compliance, Table A.13 materials type 4b, edition [year]" and state the hardness cap.
7. **Give quantity, delivery target and Incoterm**Quantity, required date, Incoterm and destination port. Standard C-276 lead time is 10–14 weeks; G28 testing adds 1–2 weeks and 3.2 witnessed inspection adds 2–3 weeks.

## Ten mistakes engineers make when ordering Alloy C-276 forgings

#### 1. Specifying an ageing or precipitation-hardening treatment

C-276 has no precipitation-hardening mechanism, and every ageing temperature sits inside the μ/P-phase window. The result is a part that passes tensile and hardness testing while having lost its corrosion resistance.

**Fix:** specify "solution annealed 1121 °C minimum, rapid quench" and nothing else. Add ASTM G28 Method A as proof.

#### 2. Allowing post-weld stress relief at 600–700 °C

Standard practice for steel pressure parts; a sensitisation cycle for C-276. It is often applied by a fabricator downstream of the forging supplier, with no one checking.

**Fix:** state "no post-weld heat treatment permitted; if PWHT is required, full solution anneal at 1121 °C with rapid quench only" on the drawing and the purchase order, and flow it down to every subcontractor.

#### 3. Air cooling heavy sections after annealing

A 200 mm section that air cools from 1121 °C spends long enough in the 1090–650 °C band to precipitate at the core. The surface tests fine.

**Fix:** require water or forced-gas quench, require the quench transfer time to be logged, and require test coupons taken from the mid-thickness rather than the surface.

#### 4. Specifying magnetic particle inspection

C-276 is non-magnetic. MT is physically impossible on it, yet it appears on inherited specifications regularly and stalls orders while it is queried.

**Fix:** specify liquid penetrant testing per ASTM E165 or EN ISO 3452 for surface examination, and ultrasonic testing per ASTM A388 or EN 10228-3 for volumetric.

#### 5. Using C-276 in strongly oxidising service

The 16 % molybdenum that makes C-276 outstanding in hydrochloric acid works against it in nitric acid and other strongly oxidising media, where chromium does the work.

**Fix:** for nitric duty specify Alloy 690, 304L or Alloy 33; for nitric-HF pickling, zirconium. Run the duty through the media selector first.

#### 6. Ordering cold-worked bar for sour service without re-checking NACE

Solution-annealed C-276 sits in ISO 15156-3 Table A.13 with a very wide envelope. Cold-worked C-276 sits in Table A.14 with a hardness cap and environmental limits. Buying cold-drawn bar to save cost quietly changes the compliance basis.

**Fix:** specify the delivery condition explicitly and require the certificate to name the ISO 15156-3 table, materials type and edition.

#### 7. Forgetting iron-contamination control

A C-276 part ground with a wheel previously used on carbon steel, or slung with a steel chain, arrives with embedded iron that rusts and initiates pitting on an otherwise perfect surface.

**Fix:** require segregated non-ferrous tooling and handling on the order, and specify pickling and passivation plus a ferroxyl test where the service is critical.

#### 8. Copying a steel machining allowance onto a nickel-alloy drawing

A 25 mm machining stock that costs little in carbon steel costs a great deal in C-276, where the removed metal is roughly ten times the price per kilogram and the machining itself is four times slower.

**Fix:** ask for a near-net or contoured-rolled profile, and use the weight calculator to see what the stock allowance is actually costing.

#### 9. Mixing bolting and gasket materials without a galvanic review

C-276 is very noble. Small carbon-steel or 316L fasteners in a large C-276 assembly corrode fast because the area ratio is unfavourable.

**Fix:** match bolting to the noble side or insulate the joint; review every transition to steel or stainless for both galvanic and differential-expansion effects.

#### 10. Accepting a certificate without the anneal chart or the G28 result

Chemistry and tensile results prove almost nothing about whether a C-276 forging is sensitised. The two documents that actually matter are the solution-anneal chart with quench record and the ASTM G28 Method A corrosion rate.

**Fix:** make both mandatory deliverables on the purchase order, with a stated acceptance limit in mm/y.

## How to write the Alloy C-276 callout on an engineering drawing

Copy this block into the material callout box of your drawing. It removes almost every ambiguity that causes rework
or a delayed release on C-276 orders.

### Instant Alloy C-276 RFQ Generator

*Interactive tool: https://www.steelforgepieces.com/Nickel-Alloy/Alloy-C-276.html#tool-rfq*

Fill in what you know and get a complete, professional enquiry text ready to email, copy or send by WhatsApp. Everything our quotation team needs, in the order we need it.

## Where is Hastelloy C276 used? Applications by industry

#### Flue-gas desulphurisation

C-276 is the benchmark alloy for FGD absorber internals, outlet ducts, quench zones, chimney liners and the associated flanges and rings. Scrubber condensate combines low pH with chloride and fluoride at moderate temperature. This is the stream that destroys stainless steel and that C-276 was built for. Typical parts: absorber shell flanges, spray-header nozzles, rolled rings.

#### Reactors, agitators and heat exchangers

Chlorinated organics, acetic and formic acid, acid chlorides and any plant where the stream composition is not fully controlled. Typical parts: agitator and mixer shafts, tube sheets, nozzles, manway rings, pump shafts and sleeves.

#### Sour service wellhead and subsea

Solution-annealed C-276 sits in ISO 15156-3 Table A.13 with an unusually wide envelope, making it a default for high-H₂S, high-chloride, low-pH completions. Typical parts: valve bodies and bonnets, choke components, hanger rings, seal sub-assemblies, forged blocks for Christmas-tree machining.

#### Bleach plant equipment

Chlorine dioxide and hypochlorite bleaching produces a hot oxidising chloride stream. Typical parts: digester and washer components, bleach-tower nozzles, agitator shafts, pump and valve parts.

#### Multi-purpose reactors

Campaign plants run different chemistries in the same vessel, so the material has to survive whatever is scheduled next quarter. C-276's dual reducing-and-oxidising resistance is bought precisely as insurance against that uncertainty.

#### Incineration scrubbers and acid recovery

Hydrochloric and hydrofluoric acid condensates with heavy-metal contamination. Typical parts: quench-vessel rings, scrubber nozzles, tube sheets, flue-gas duct flanges.

#### Seawater and brine handling

C-276 is immune to chloride stress-corrosion cracking and has a critical crevice temperature around 85 °C, which covers hot brine service that defeats super duplex. Typical parts: pump shafts and sleeves, valve trim, heat-exchanger tube sheets.

#### Pickling and acid regeneration

Hydrochloric acid regeneration plants, phosphoric acid production with fluoride contamination, and mixed-acid handling, subject to the nitric-acid caution noted above.

## Glossary of Alloy C-276 terms

**Alloy C-276**
: Generic name for the low-carbon nickel-molybdenum-chromium alloy with tungsten, UNS N10276. Identical in chemistry and properties to the material sold under the Hastelloy® C-276 trademark, which belongs to Haynes International, Inc. Buyers use the two names interchangeably; only the purchase-order wording needs care.

**UNS N10276**
: The Unified Numbering System designation. The correct, unrestricted name to put on a purchase order or drawing.

**W.Nr. 2.4819 / NiMo16Cr15W**
: The German Werkstoff number and the EN chemical-symbol designation for the same chemistry, used across European documentation and VdTÜV Werkstoffblatt 400.

**ASTM B564 / ASME SB-564**
: The specification for nickel alloy forgings and the identical ASME Boiler and Pressure Vessel Code edition of it. Governs chemistry, mechanical minimums, testing and certification for C-276 forgings.

**Solution annealing**
: Heating to 1121 °C (2050 °F) minimum to dissolve carbides and intermetallic phases back into the matrix, followed by rapid quenching to keep them dissolved. The only heat treatment applicable to C-276.

**Sensitisation**
: Loss of corrosion resistance caused by grain-boundary precipitation of μ phase, P phase or M₆C carbides and the resulting local depletion of chromium and molybdenum. In C-276 it occurs between roughly 650 °C and 1090 °C.

**μ phase (mu phase)**
: A topologically close-packed intermetallic compound rich in nickel, molybdenum and tungsten. The dominant embrittling and sensitising phase in C-276.

**P phase**
: A second intermetallic phase that forms alongside μ phase in Ni-Mo-Cr-W alloys, with the same practical consequences.

**PREN**
: Pitting Resistance Equivalent Number. For tungsten-bearing alloys, PRENW = %Cr + 3.3(%Mo + 0.5 %W) + 16 %N. C-276 is approximately 74. It ranks chloride pitting resistance only.

**CPT / CCT**
: Critical pitting temperature and critical crevice temperature, determined per ASTM G48. C-276 typically exceeds 100 °C CPT and reaches about 85 °C CCT.

**ASTM G28 Method A**
: The 24-hour boiling ferric sulfate–50 % sulfuric acid immersion test. The standard proof that a C-276 part is correctly annealed and free of intermetallic phase.

**ERNiCrMo-4**
: AWS A5.14 designation for matching C-276 bare welding wire. ENiCrMo-4 is the corresponding covered electrode per A5.11.

**Reducing vs oxidising**
: The redox character of a corrosive stream. Reducing conditions (de-aerated acids) favour high molybdenum, which is why C-276 excels there; oxidising conditions (nitric acid, ferric ion) favour high chromium, which is where C-22 and Alloy 59 take over.

**ISO 15156-3 Table A.13, type 4b**
: The classification under which solution-annealed UNS N10276 is accepted for sour production service, without the environmental restrictions applied to leaner alloys. Cold-worked material falls under Table A.14 as type 4e.

**EN 10204 3.1 / 3.2**
: Inspection document types. 3.1 is a mill certificate issued by the manufacturer's own independent inspection function; 3.2 is countersigned by an independent third-party inspector nominated by the purchaser.

**Iron contamination**
: Embedded free iron transferred from carbon-steel tooling, slings or blast media onto a nickel-alloy surface. It rusts and initiates pitting; controlled by segregated non-ferrous handling, pickling and passivation.

## Frequently asked questions about Hastelloy C276 / Alloy C-276 / UNS N10276

#### Is Hastelloy C276 the same as Alloy C-276 and UNS N10276?

**Yes. They are one alloy under several names.** **Hastelloy® C276** is the registered trademark of Haynes International, Inc. and the name most engineers use in conversation and on enquiries. **Alloy C-276** is the generic industry name for the same grade. **UNS N10276** is its Unified Numbering System designation, **W.Nr. 2.4819 (NiMo16Cr15W)** the European material number, **NS334 / NS3304** the Chinese GB designation and **ERNiCrMo-4** the matching welding consumable. The chemistry, the mechanical minimums and the corrosion behaviour are identical whichever name is used. Jiangyin Jiangnan Metal Co., Ltd. manufactures this grade and certifies it as UNS N10276 / ASTM B564; we are not affiliated with Haynes International and do not resell their branded material.

#### Can you supply Hastelloy C276 forgings?

We supply forgings in **the alloy you mean when you say Hastelloy C276**, manufactured by us and certified as **UNS N10276 to ASTM B564 / ASME SB-564**. What we cannot do is sell you material carrying the Hastelloy® brand, because that trademark belongs to Haynes International, Inc. and only they may apply it. For every practical purpose the distinction is a labelling one: the specification, the acceptance limits, the ASTM G28 corrosion test and the NACE MR0175 listing are written against UNS N10276, not against a brand. Send your enquiry written however you normally write it and we will quote and certify to the generic designation.

#### Why is Hastelloy C276 sometimes written C-276, C276 or Hastelloy alloy C-276?

They are all the same grade. The hyphen is a typographic habit rather than a standard: Haynes writes **HASTELLOY® C-276 alloy**, ASTM and the UNS system use **N10276** with no letter prefix at all, and drawings, ERP systems and purchase orders shorten it to **C276**, **C-276**, **Hastelloy C276** or **Alloy C276** depending on who typed it. None of these variants changes what you receive. Only two forms carry contractual meaning: **UNS N10276**, which fixes the chemistry, and **ASTM B564**, which fixes the product form, testing and certification. Use the designation lookup to convert whatever your drawing says into the full equivalent set.

#### What is the chemical composition of Hastelloy C276 / Alloy C-276?

Per ASTM B564 / B574, in weight percent: molybdenum 15.0–17.0, chromium 14.5–16.5, iron 4.0–7.0, tungsten 3.0–4.5, cobalt 2.5 max, manganese 1.0 max, vanadium 0.35 max, phosphorus 0.04 max, sulfur 0.03 max, silicon 0.08 max, carbon 0.010 max, nickel remainder (typically about 57 %). The very low carbon and silicon limits are what distinguish C-276 from the older Alloy C and give it weldability without a post-weld solution anneal. See the full composition table.

#### Can Hastelloy C276 be age hardened or precipitation hardened?

**No.** C-276 is a solid-solution strengthened alloy with no precipitation-hardening mechanism. The only correct heat treatment is solution annealing at 1121 °C (2050 °F) minimum followed by rapid quenching. Any ageing cycle sits in the 650–1090 °C range and will precipitate μ and P intermetallic phases plus M₆C carbides at the grain boundaries, reducing ductility and destroying corrosion resistance. Purchase specifications calling for solution treatment plus ageing on C-276 are technically incorrect and should be corrected before ordering.

#### What are the minimum mechanical properties of Alloy C-276 forgings?

ASTM B564 / ASME SB-564 requires, for UNS N10276 forgings in the solution-annealed condition: **tensile strength 690 MPa (100 ksi) minimum**, **yield strength at 0.2 % offset 283 MPa (41 ksi) minimum**, and **elongation 40 % minimum** in 2 inches or 4D. Typical measured values on annealed forgings are higher: 760–830 MPa tensile, 355–420 MPa yield and 50–60 % elongation, with hardness usually below 100 HRB.

#### What is the density of Hastelloy C276 / Alloy C-276?

**8.89 g/cm³ (0.321 lb/in³).** That is about 11 % heavier than 316L stainless, which matters when converting an existing stainless design: both the finished part weight and the raw-material cost rise. Use the weight calculator for finished, rough-forging and billet weights.

#### Is Hastelloy C276 magnetic?

**No.** C-276 has a face-centred-cubic austenitic structure in the solution-annealed condition and is essentially non-magnetic, with relative permeability close to 1.0002 at room temperature. A magnetic response on a supposed C-276 part indicates a wrong material or heavy iron contamination and should trigger positive material identification. This is also why magnetic particle inspection cannot be used on C-276. Specify liquid penetrant testing instead.

#### What is the maximum service temperature of Alloy C-276?

Two limits apply, and confusing them is a common error. For **wet corrosion service the practical ceiling is about 400 °C (750 °F)**, because prolonged exposure above roughly 650 °C precipitates intermetallic phases that sensitise the alloy. For **dry, structural or high-temperature service** where corrosion resistance is not required, C-276 can be used to about 1040 °C (1900 °F). Any component that must retain full corrosion resistance should never be held between 650 °C and 1090 °C.

#### What is the PREN of Hastelloy C276?

Using the tungsten-corrected formula PREN = %Cr + 3.3(%Mo + 0.5 %W), C-276 at nominal composition (15.5 Cr, 16 Mo, 3.75 W) gives approximately **74**. The commonly quoted range is 68–76 depending on heat chemistry and formula. For comparison, 316L is about 25 and super duplex about 42, which is why C-276 is chosen when chloride pitting and crevice corrosion cannot be controlled with a stainless grade. Calculate it for your own heat with the PREN calculator.

#### Is Alloy C-276 acceptable for NACE MR0175 / ISO 15156 sour service?

**Yes.** In the solution-annealed condition, UNS N10276 is listed in **ISO 15156-3 Table A.13 as materials type 4b** for sour production environments, and is widely accepted in that condition without temperature, H₂S partial-pressure or chloride restrictions. Most purchase specifications cap hardness at 35 HRC, which an annealed forging clears easily. **Cold-worked** C-276 falls under Table A.14 as type 4e, with a 40 HRC maximum and defined environmental limits. Always verify against the edition in force at the contract date. Jiangyin Jiangnan Metal supplies solution-annealed C-276 forgings with a compliance statement and hardness results on the certificate.

#### What is the difference between Hastelloy C276 and Hastelloy C22?

C-276 (UNS N10276) has higher molybdenum plus tungsten and lower chromium, so it performs better in strongly **reducing** acids such as hydrochloric and dilute sulfuric. C-22 (UNS N06022) has about 22 % chromium and better resistance in **oxidising** media such as nitric acid, ferric and cupric chlorides, and mixed oxidising-reducing conditions. C-22 also has a wider window before intermetallic precipitation, so it tolerates heavy welding better. The rule of thumb: reducing service means C-276, oxidising or mixed service means C-22. See the full comparison table.

#### Should I use Hastelloy C276 or Inconel 625?

Alloy 625 (UNS N06625) is a nickel-chromium-molybdenum-niobium alloy with higher strength (414 MPa minimum yield versus 283 MPa) and better high-temperature performance, and it costs less. Alloy C-276 has roughly twice the molybdenum-equivalent and clearly outperforms 625 in hydrochloric acid, sulfuric acid, wet chlorine and hot concentrated chlorides. Choose **625** for seawater, sour gas and elevated-temperature strength; choose **C-276** when reducing acids, mixed acid-chloride streams or FGD condensates are involved.

#### Can Alloy C-276 be welded, and is post-weld heat treatment required?

**Yes.** C-276 was developed specifically to be usable in the as-welded condition. Its extra-low carbon (0.010 % max) and silicon (0.08 % max) limits suppress grain-boundary carbide precipitation in the heat-affected zone. GTAW and GMAW with matching ERNiCrMo-4 filler are standard. Post-weld solution annealing is normally *not* required, but it is recommended for the most aggressive duties, for heavily restrained multi-pass joints and where the buyer specifies ASTM G28 Method A testing on the weldment. Keep interpass temperature below about 100 °C, use stringer beads and back-purge the root. Never apply a conventional 600–700 °C stress relief.

#### What is the forging temperature range for Alloy C-276?

Start at **1180–1230 °C (2150–2250 °F)**, finish no lower than **950 °C (1750 °F)**. The alloy work-hardens rapidly and has a narrower hot-working window than steel, so heavy sections are reheated frequently rather than pushed to the last blow. Every forging must be solution annealed at 1121 °C minimum and rapidly quenched after the final forging operation, because slow cooling through 1090–650 °C precipitates μ and P phases. Generate a full cycle with the anneal recipe generator.

#### What forged shapes and sizes are available in Alloy C-276?

Jiangyin Jiangnan Metal Co., Ltd. supplies UNS N10276 as **seamless rolled rings to 2,500 mm outside diameter**, **forged discs to Ø1,800 mm**, **forged shafts to 8 m length**, forged flanges, tube sheets, valve bodies and bonnets, bushings, sleeves, nozzles and round bar from Ø25 to Ø500 mm, with single-piece weights up to **8,000 kg**. Parts are supplied rough machined or finish machined to drawing.

#### What is the lead time for Alloy C-276 forgings?

Standard C-276 open-die forgings and rolled rings ship in **10 to 14 weeks** from order confirmation, because C-276 billet is normally purchased against the order rather than held in stock. ASTM G28 intergranular corrosion testing typically adds one to two weeks, and EN 10204 3.2 third-party witnessed inspection adds two to three weeks. Small bar-derived parts in common diameters can sometimes be released in 6 to 8 weeks.

#### How does Hastelloy C276 perform in hydrochloric acid?

C-276 is one of the few commercially available wrought alloys that resists hydrochloric acid across the full concentration range at moderate temperature. As a working guide it stays below 0.13 mm/y in dilute HCl up to about 10 % at 50 °C, and handles medium concentrations at ambient temperature. Resistance falls sharply as both concentration and temperature rise, and oxidising contaminants such as ferric ion change the picture completely, sometimes for the better. For boiling or concentrated HCl duty, [Alloy B-3 (UNS N10675)](https://www.steelforgepieces.com/Nickel-Alloy/Hastelloy-B-3.html) is usually correct *unless* oxidising species are present, in which case B-3 fails and C-276 does not. Explore the boundary with the isocorrosion chart.

#### Which certificates and tests are supplied with Alloy C-276 forgings?

Every forging ships with an **EN 10204 3.1** material test certificate showing heat number, full chemical analysis, solution-annealing chart record with quench data, tensile and hardness results and NDE results. **EN 10204 3.2** certificates witnessed by Lloyd's Register, DNV, Bureau Veritas, ABS, TÜV or SGS are available on request. Optional tests include ASTM G28 Method A and B intergranular corrosion, ASTM G48 pitting and crevice, ultrasonic testing per ASTM A388 or EN 10228-3, liquid penetrant per ASTM E165, positive material identification and NACE MR0175 / ISO 15156-3 compliance statements.

## Technical references

Chemistry, mechanical, physical, corrosion and heat-treatment data on this page are drawn from the published standards and engineering references below. Test results reported on our material certificates are independent and traceable to calibrated equipment.

1. ASTM B564/B564M, *Standard Specification for Nickel Alloy Forgings*, ASTM International, West Conshohocken, PA.
2. ASTM B574/B574M, *Standard Specification for Low-Carbon Nickel-Chromium-Molybdenum, Low-Carbon Nickel-Molybdenum-Chromium … Alloy Rod, Bar, and Wire*, ASTM International.
3. ASTM B575/B575M, *Standard Specification for Low-Carbon Nickel Alloy Plate, Sheet, and Strip*, ASTM International.
4. ASTM B622/B622M, *Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube*, ASTM International.
5. ASTM B366/B366M, *Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings*, ASTM International.
6. ASME Boiler and Pressure Vessel Code, Section II Part B (SB-564, SB-574, SB-575, SB-622) and Section VIII Division 1, latest edition, American Society of Mechanical Engineers.
7. ASTM G28, *Standard Test Methods for Detecting Susceptibility to Intergranular Corrosion in Wrought, Nickel-Rich, Chromium-Bearing Alloys*, ASTM International.
8. ASTM G48, *Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution*, ASTM International.
9. NACE MR0175 / ISO 15156-3:2020, *Petroleum and natural gas industries. Materials for use in H₂S-containing environments in oil and gas production. Part 3: Cracking-resistant CRAs and other alloys*, International Organization for Standardization.
10. EN 10204:2004, *Metallic products. Types of inspection documents*, CEN, Brussels.
11. EN 10228-3, *Non-destructive testing of steel forgings. Part 3: Ultrasonic testing of ferritic or martensitic steel forgings*, CEN (referenced for acceptance-class practice).
12. ASTM A388/A388M, *Standard Practice for Ultrasonic Examination of Steel Forgings*, ASTM International.
13. ASTM E165/E165M, *Standard Practice for Liquid Penetrant Testing for General Industry*, ASTM International.
14. ASTM E8/E8M and ISO 6892-1, tensile testing of metallic materials.
15. ASTM E112, *Standard Test Methods for Determining Average Grain Size*, ASTM International.
16. AWS A5.14/A5.14M, *Specification for Nickel and Nickel-Alloy Bare Welding Electrodes and Rods* (ERNiCrMo-4), American Welding Society.
17. AWS A5.11/A5.11M, *Specification for Nickel and Nickel-Alloy Welding Electrodes for Shielded Metal Arc Welding* (ENiCrMo-4), American Welding Society.
18. VdTÜV Werkstoffblatt 400, *NiMo16Cr15W (2.4819)*, Verband der TÜV e.V.
19. ASM Handbook, Volume 2: *Properties and Selection: Nonferrous Alloys and Special-Purpose Materials*, ASM International, Materials Park, OH. Chapter on corrosion-resistant nickel alloys.
20. ASM Handbook, Volume 13B: *Corrosion: Materials*, ASM International. Sections on Ni-Cr-Mo alloys and intergranular corrosion.
21. ASM Specialty Handbook: *Nickel, Cobalt, and Their Alloys*, J.R. Davis (ed.), ASM International.
22. Rebak, R.B., "Corrosion of Non-Ferrous Alloys: Nickel-Based Alloys", in *Corrosion and Environmental Degradation*, Wiley-VCH.
23. Haynes International, *HASTELLOY® C-276 alloy* technical brochure H-2002. Trademark holder's published datasheet, retrievable at haynesintl.com.
24. API Specification 6A, *Specification for Wellhead and Tree Equipment*, American Petroleum Institute.

Standards cited are the most recent revisions known at the time of the last page review. For procurement, always reference the revision in force at the contract date. All trademarks are the property of their respective owners.

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