# UNS N06200 Forgings: Rolled Rings, Flanges, Bars, Discs and Shafts

Hastelloy C-2000 / Alloy C-2000 / W.Nr. 2.4675 / NiCr23Mo16Cu / ASTM B564 / ASME SB-564

Source page: https://www.steelforgepieces.com/Nickel-Alloy/UNS-N06200.html
Manufacturer: Jiangyin Jiangnan Metal Co., Ltd., No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
Contact: sales@steelforgepieces.com / +86 189 2135 9659
Published 29 August 2026. Last reviewed 29 August 2026.

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## Summary

UNS N06200 is a nickel-chromium-molybdenum alloy containing a deliberate 1.6 % copper addition. It is sold commercially as Hastelloy C-2000 or Alloy C-2000 and carries the European number 2.4675. With 23 % chromium and 16 % molybdenum behind it, the copper lets one grade cover both oxidizing and reducing acids, including sulfuric, without giving up the chloride pitting and stress-corrosion resistance of the other C-family alloys.

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. It forges UNS N06200 to ASTM B564: seamless rolled rings, flanges, round bars, discs, shafts, tube sheets, sleeves, bushings and hollow forgings, supplied solution annealed with EN 10204 3.1 or 3.2 certification.

| Field | Value |
| --- | --- |
| UNS number | N06200 |
| Werkstoff | 2.4675 |
| Alloy type | Ni-Cr-Mo-Cu |
| Cr / Mo / Cu | 23 / 16 / 1.6 % |
| Forging standard | ASTM B564 |
| Delivery condition | Solution annealed |

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## What UNS N06200 is

UNS N06200 is a wrought, solid-solution nickel alloy introduced in 1995 as Hastelloy C-2000. It belongs to the Ni-Cr-Mo group that also contains C-276 and C-22, and it is the only member of that group with an intentional copper addition.

Each of the three main alloying elements answers a different corrosion problem. Chromium at 23 % covers oxidizing media: nitric acid, ferric and cupric ion contamination, dissolved oxygen. Molybdenum at 16 % covers reducing media, mainly hydrochloric acid, and carries the pitting and crevice resistance in chlorides. Copper at 1.6 % is what the other C-family grades do not have. It raises resistance to sulfuric acid, the one service where C-276 and C-22 fall short.

The alloy gains its strength from solid solution, not from precipitation, so it is never age hardened. Forgings leave the shop solution annealed. Carbon is capped at 0.010 % and silicon at 0.08 % so that carbides do not precipitate at grain boundaries and weaken corrosion resistance in the heat affected zone after welding.

In purchasing terms the grade is specified for two situations. One is a process stream that swings between oxidizing and reducing conditions and would otherwise need two different materials. The other is sulfuric acid service where C-276 has already been ruled out.

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## Designations and standards

| System or product form | Designation |
| --- | --- |
| UNS number | N06200 |
| Trade name | Hastelloy C-2000, Alloy C-2000, Alloy 2000 |
| Werkstoff (DIN / EN) | 2.4675 |
| EN chemical symbol | NiCr23Mo16Cu |
| Forgings | ASTM B564, ASME SB-564 |
| Forged flanges and fittings | ASTM B462, ASME SB-462 |
| Wrought fittings | ASTM B366 |
| Rod, bar and wire | ASTM B574 |
| Plate, sheet and strip | ASTM B575 |
| Pipe and tube | ASTM B622, B619, B626 |
| Welding consumables | AWS A5.14 ERNiCrMo-17, AWS A5.11 ENiCrMo-17 |
| Pressure equipment | Listed in ASME BPVC Section II and VIII. NACE MR0175 / ISO 15156 on request |

Hastelloy and C-2000 are registered trademarks of Haynes International, Inc. Jiangyin Jiangnan Metal manufactures to the UNS N06200 composition and to ASTM and ASME specifications. The trade names appear here only to identify the grade.

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## Chemical composition, weight percent

Limits follow ASTM B564 and B574 for UNS N06200. The aim column shows the target values written into the purchase specification for each heat.

| Element | Min | Max | Aim | Function |
| --- | --- | --- | --- | --- |
| Ni, nickel | Balance | - | 59 | Matrix. General corrosion and SCC resistance |
| Cr, chromium | 22.0 | 24.0 | 23.0 | Oxidizing acids, ferric and cupric ions, dissolved oxygen |
| Mo, molybdenum | 15.0 | 17.0 | 16.0 | Reducing acids. Pitting and crevice resistance |
| Cu, copper | 1.3 | 1.9 | 1.6 | The defining addition. Sulfuric acid resistance |
| Fe, iron | - | 3.0 | 2.0 max | Residual |
| Co, cobalt | - | 2.0 | 0.5 max | Residual. Restricted for nuclear service |
| Mn, manganese | - | 0.50 | 0.30 max | Deoxidizer |
| Al, aluminum | - | 0.50 | 0.30 max | Deoxidizer |
| C, carbon | - | 0.010 | 0.008 max | Kept low against carbide precipitation in the HAZ |
| Si, silicon | - | 0.08 | 0.05 max | Kept low for thermal stability |
| P, phosphorus | - | 0.025 | 0.015 max | Impurity |
| S, sulfur | - | 0.010 | 0.005 max | Impurity. Affects hot workability |

The UNS N06200 range is wider than the proprietary Hastelloy C-2000 specification, which is held to tighter limits.

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## Mechanical properties, solution annealed, room temperature

Minimum values under ASTM B564.

| Property | Minimum, metric | Minimum, imperial | Typical |
| --- | --- | --- | --- |
| Tensile strength, Rm | 690 MPa | 100 ksi | 745 to 800 MPa |
| Yield strength, Rp0.2 | 310 MPa | 45 ksi | 350 to 400 MPa |
| Elongation, A5 | 45 % | 45 % | 55 to 65 % |
| Reduction of area | Report | Report | 60 to 70 % |
| Hardness | 100 HRB max | 100 HRB max | 85 to 95 HRB |
| Charpy V-notch impact | Not called for by B564 | | Available on request, down to -196 C |

UNS N06200 is not a precipitation hardening alloy. A request for solution plus age treatment on this grade should be queried, because ageing does not apply and will not raise strength.

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## Physical and thermal properties

| Property | Metric | Imperial |
| --- | --- | --- |
| Density | 8.50 g/cm3 | 0.307 lb/in3 |
| Melting range | 1328 to 1358 C | 2422 to 2476 F |
| Modulus of elasticity at 20 C | 206 GPa | 29.9 x 10^6 psi |
| Thermal conductivity at 20 C | 10.8 W/m.K | 75 Btu.in/ft2.h.F |
| Mean thermal expansion, 25 to 100 C | 12.4 um/m.C | 6.9 uin/in.F |
| Specific heat at 20 C | 428 J/kg.K | 0.102 Btu/lb.F |
| Electrical resistivity at 20 C | 1.28 uohm.m | 770 ohm.circ mil/ft |
| Magnetic permeability | About 1.0002, effectively non-magnetic | |
| Solution anneal temperature | 1149 C, rapid quench | 2100 F, rapid quench |
| Hot working range | 1010 to 1177 C | 1850 to 2150 F |

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## Corrosion performance

- Critical pitting temperature: 145 C in acidified 6 % ferric chloride
- Critical crevice temperature: 80 C in acidified 6 % ferric chloride
- Chloride SCC: no cracking after 1008 hours in ASTM G36 boiling 45 % magnesium chloride

| Medium | Behavior | Comment |
| --- | --- | --- |
| Sulfuric acid | Best in the C group | The copper addition buys this. Usually the reason N06200 is chosen over C-276 |
| Hydrochloric acid | Excellent | 16 % Mo. Comparable to C-22 from dilute to mid concentrations |
| Hydrofluoric acid | Good | Used in HF alkylation and in pickling service |
| Nitric and mixed oxidizing acids | Very good | 23 % Cr. Tolerates ferric and cupric contamination |
| Phosphoric acid | Very good | Including contaminated wet process acid |
| Chloride pitting and crevice | Excellent | Seawater and brine |
| Caustic and alkaline | Very good | Stable in hot caustic. Check concentration and temperature |
| High temperature oxidation | Moderate | A corrosion resistant alloy, not a heat resistant one. Above roughly 650 C look at Inconel 601 or 617 |

Corrosion data is taken from published Haynes International technical literature for Hastelloy C-2000 alloy and is a selection guide, not a warranty.

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## UNS N06200 forged products

Every item is forged against a drawing or a dimensional data sheet, then solution annealed, machined to the agreed allowance and tested before shipment. Single pieces and prototype quantities are quoted.

- **Seamless rolled rings.** Radial-axial rolled from an upset and pierced blank. Grain flow follows the circumference. Bearing races, tower flanges, shell courses. Rectangular, contoured and stepped sections.
- **Forged flanges.** Weld neck, slip-on, blind, lap joint, orifice and custom bore to ASTM B462 with ASME B16.5 or B16.47 dimensions, or to drawing. Class 150 through Class 2500, RF, RTJ and FF faces.
- **Round bars and shafts.** Forged and peeled or rough turned for machined valve parts, pump shafts, stems and fasteners.
- **Discs, blanks and tube sheets.** Upset forged for closures, blind flanges, valve bodies and heat exchanger tube sheets, drilled or undrilled.
- **Sleeves, bushings and hollows.** Bored and trepanned hollows for cylinders, liners, nozzles and pump casings.
- **Valve components.** Bodies, bonnets, stems, seat rings, gate and plug blanks for ball, gate, globe, check and control valves. NACE MR0175 / ISO 15156 compliance available.

### Dimensions to state on the enquiry

| Form | Dimensions to give |
| --- | --- |
| Seamless rolled ring | Outside diameter, inside diameter, height, section profile if not rectangular |
| Flange | Type, nominal size, class, facing, bore, or the drawing |
| Round bar or shaft | Diameter, length, straightness class, surface condition |
| Disc or blank | Diameter, thickness, bore if any |
| Sleeve or hollow | Outside diameter, inside diameter, length, bored or trepanned |
| All forms | Quantity, delivery condition, NDT class, certification level, applicable project specification |

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## Forging route

**Melting and billet supply.** Electric arc furnace melting with AOD or VOD refining, then electroslag remelting to control segregation and inclusion content. Vacuum induction melting with ESR where a project calls for a double melt route. Each heat is analysed before release and the heat number follows the material through every later operation.

**Open-die forging.** Billets are heated into the 1010 to 1177 C window and worked to a controlled reduction schedule. The alloy work hardens fast and finishing below the lower limit risks cracking. Forging reduction is agreed at order stage, with 3:1 taken as the normal minimum for this grade. Rings are upset, punched and ring rolled.

**Solution annealing.** 1149 C with a rapid quench, held 10 to 30 minutes depending on section thickness. Furnace charts are kept with the job file. The alloy is not aged.

**Machining and finishing.** Rough or finish machining to the stated allowance, then pickling or bead blasting where a clean surface is specified.

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## Testing and certification

| Item | Scope |
| --- | --- |
| Chemical analysis | Optical emission spectrometry on every heat. PMI by XRF before packing |
| Mechanical testing | Tensile and hardness to ASTM A370 and ASTM E8 |
| Ultrasonic testing | ASTM A388, EN 10228-3 or SEP 1921, class agreed at order stage |
| Surface NDT | Liquid penetrant to ASTM E165 or EN 10228-2. Magnetic particle does not apply |
| Corrosion testing | ASTM G28 method A intergranular attack |
| Certification | EN 10204 3.1 as standard, 3.2 with BV, SGS, TUV, Lloyd's or DNV on request |

Third-party inspection at the works is welcome. Where a project needs PED 2014/68/EU Annex I 4.3 or AD 2000-W0 material, state it on the enquiry.

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## Applications

Sulfuric acid plants (acid coolers, distributors, pump shafts, valve internals, tube sheets). Chemical process plant (reactor internals, agitator shafts, nozzles, columns, tower flanges). Pharmaceutical and fine chemicals. Flue gas desulfurization. Pickling and metal finishing. Oil, gas and geothermal wellhead components. Pulp, paper and chlorine dioxide bleaching. Waste and effluent treatment.

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## UNS N06200 compared with C-276, C-22 and Alloy 59

| Property | UNS N06200 | Hastelloy C-276 | Hastelloy C-22 | Alloy 59 |
| --- | --- | --- | --- | --- |
| UNS number | N06200 | N10276 | N06022 | N06059 |
| Werkstoff | 2.4675 | 2.4819 | 2.4602 | 2.4605 |
| Cr, % | 23 | 16 | 22 | 23 |
| Mo, % | 16 | 16 | 13 | 16 |
| W, % | - | 4 | 3 | - |
| Cu, % | 1.6 | - | - | - |
| Sulfuric acid | Best of the four | Moderate | Moderate | Good |
| Hydrochloric acid | Excellent | Excellent | Very good | Excellent |
| Oxidizing media | Excellent | Moderate | Excellent | Excellent |
| Minimum tensile | 690 MPa | 690 MPa | 690 MPa | 690 MPa |
| Usual reason to choose | Mixed acid duty including H2SO4 | Established specification | Oxidizing-dominant duty | Broadest resistance |

All four are forged at Jiangyin, so one enquiry can be priced across the alternatives where the specification allows substitution.

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## Welding and machining

**Welding.** GTAW, GMAW and SMAW without difficulty. Matching filler is AWS A5.14 ERNiCrMo-17 for gas shielded processes and AWS A5.11 ENiCrMo-17 for stick electrodes. ERNiCrMo-10, the C-22 filler, is an accepted substitute. Keep heat input low, hold interpass temperature under 100 C, avoid weaving. No preheat needed. Any hot forming after welding has to be followed by re-annealing.

**Machining.** The alloy work hardens quickly. Rigid setups, sharp positive rake carbide tooling, slow speeds with a heavy positive feed, flood coolant. Do not let the tool dwell in the cut. Leave 3 to 6 mm machining allowance on forgings finish machined after final heat treatment.

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## Frequently asked questions

**What is UNS N06200?**
A nickel-chromium-molybdenum alloy with a nominal composition of 59 % nickel, 23 % chromium, 16 % molybdenum and 1.6 % copper. Sold as Hastelloy C-2000 or Alloy C-2000, European number 2.4675.

**What is UNS N06200 equivalent to?**
Hastelloy C-2000, Alloy C-2000, Alloy 2000, Werkstoff 2.4675, NiCr23Mo16Cu. The UNS range is slightly wider than the proprietary Hastelloy C-2000 specification.

**Which standard covers UNS N06200 forgings?**
ASTM B564, adopted as ASME SB-564. Flanges and fittings under ASTM B462, wrought fittings under ASTM B366, bar under ASTM B574, plate and sheet under ASTM B575.

**What heat treatment do UNS N06200 forgings receive?**
Solution annealing at 1149 C followed by a rapid quench, held 10 to 30 minutes depending on section thickness. The alloy is not age hardened. Re-annealing is required after hot forming and after cold forming above 7 % outer fibre elongation.

**Is UNS N06200 better than Hastelloy C-276?**
In sulfuric acid and oxidizing media, yes. In hydrochloric acid the two are close. C-276 is more widely stocked, so N06200 is normally chosen when sulfuric acid or a mixed oxidizing-reducing stream is in the service envelope.

**What sizes of UNS N06200 forging can be made?**
Sizes are quoted against the drawing, since every piece is open-die forged to order. Give outside diameter, inside diameter, height or length, wall or thickness and quantity, and Jiangyin Jiangnan Metal will confirm feasibility, weight and price. Single pieces are quoted.

**Can UNS N06200 be welded?**
Yes, by GTAW, GMAW and SMAW. Matching AWS A5.14 ERNiCrMo-17 filler wire or AWS A5.11 ENiCrMo-17 electrodes. ERNiCrMo-10 is an accepted substitute. No preheat needed.

**Is UNS N06200 magnetic?**
No. Magnetic permeability is about 1.0002. Magnetic particle inspection cannot be used, so liquid penetrant to ASTM E165 is used instead.

**What certificates come with UNS N06200 forgings?**
EN 10204 3.1 as standard, listing heat number, chemical analysis, mechanical results, heat treatment record and NDT results. EN 10204 3.2 endorsed by BV, SGS, TUV, Lloyd's or DNV on request.

**Who supplies UNS N06200 open-die forgings in China?**
Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. It makes UNS N06200 seamless rolled rings, forged flanges, bars, discs, shafts, sleeves and tube sheets to ASTM B564. Enquiries: sales@steelforgepieces.com or +86 189 2135 9659.

**What drives the lead time on UNS N06200 forgings?**
Billet availability, because this grade is not held in stock as a standard item. Confirming melt availability early shortens the schedule.

**Does UNS N06200 meet NACE MR0175 and ISO 15156?**
It can be supplied to NACE MR0175 and ISO 15156 for sour service in the solution annealed condition, subject to the hardness limit in the standard.

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## Request a quotation

Send a drawing or the raw dimensions to sales@steelforgepieces.com. Include grade and specification (UNS N06200, ASTM B564), product form, finished or rough dimensions, quantity, delivery condition, NDT and acceptance class, certification level, and any project or end user specification that applies.

Jiangyin Jiangnan Metal Co., Ltd.
No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
sales@steelforgepieces.com / +86 189 2135 9659
https://www.steelforgepieces.com/

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## Related grades

Hastelloy C-2000, Hastelloy C-276, Hastelloy C-22, Hastelloy C-4, Alloy 59, Hastelloy B-2, Hastelloy B-3, Hastelloy B-4, Hastelloy G-3, Hastelloy X, Alloy 602 CA, Inconel 625, Inconel 600, Inconel 601, Inconel 617, Inconel 690, Inconel 693, Inconel 725, Inconel X-750, Incoloy 825, Incoloy 800, Incoloy 800H, Incoloy 800HT, Incoloy 925, Incoloy 926, Incoloy 945, Monel 400, Monel K-500, Nickel 200, Nickel 201.

Full index: https://www.steelforgepieces.com/Nickel-Alloy/

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Alloy property data on this page is compiled from ASTM B564, B574 and B575 and from published Haynes International technical literature for Hastelloy C-2000 alloy. Hastelloy and C-2000 are registered trademarks of Haynes International, Inc. Inconel, Incoloy, Monel and Nimonic are trademarks of Special Metals Corporation. Jiangyin Jiangnan Metal Co., Ltd. is not affiliated with either company and manufactures to UNS, ASTM and ASME specifications.