---
title: "CoCr22NiW Forgings (Alloy 188 / UNS R30188 / W.Nr. 2.4683 / AMS 5772)"
description: "CoCr22NiW cobalt superalloy forgings to AMS 5772. Composition, mechanical and creep data, oxidation and hot corrosion behaviour, forging and heat treatment practice, and how to specify an order."
canonical: "https://www.steelforgepieces.com/Nickel-Alloy/CoCr22NiW.html"
manufacturer: "Jiangyin Jiangnan Metal Co., Ltd."
published: 2022-08-18
updated: 2026-08-15
language: en
---

# CoCr22NiW Forgings

**UNS R30188 · W.Nr. 2.4683 · AMS 5772 · Alloy 188 · Co-22Cr-22Ni-14W**

Plain-text version of <https://www.steelforgepieces.com/Nickel-Alloy/CoCr22NiW.html>
Published 18 August 2022. Last updated 15 August 2026.
Written by the Jiangyin Jiangnan Metal Co., Ltd. metallurgical engineering team and reviewed by our QA department.
Data traceable to AMS 5772, AMS 5608 and MMPDS 6.4.2.

---

## Key data

| Property | Value |
|---|---|
| UNS number | R30188 |
| Werkstoff number | 2.4683 |
| Bar, forgings and rings | AMS 5772 |
| Sheet, strip and plate | AMS 5608 |
| Welding wire | AMS 5801 |
| Design allowables | MMPDS chapter 6.4.2 |
| Nominal chemistry | 39 % Co (balance), 22 % Ni, 22 % Cr, 14 % W, 0.03 % La, 0.10 % C |
| Density | 8.98 g/cm³ (0.324 lb/in³) |
| Melting range | 1315-1410 °C (2400-2570 °F) |
| Maximum prolonged oxidising service temperature | 1095 °C (2000 °F) |
| Hot working start temperature | 1175 °C (2150 °F) |
| Solution heat treatment | 1177 °C ± 14 °C (1163-1191 °C), rapid cool or water quench |
| Room temperature UTS, solution annealed | 991 MPa (144 ksi) typical |
| Room temperature 0.2 % yield, solution annealed | 483 MPa (70 ksi) typical |
| Strengthening mechanism | Solid solution. No aging condition. |
| Magnetic response | Non-magnetic |

## Manufacturer

**Jiangyin Jiangnan Metal Co., Ltd.** is an open-die forging factory in Jiangyin, Jiangsu Province, China, founded in 2008, with 460 employees including 9 senior engineers and 32 intermediate engineers. ISO 9001:2015 certified, exporting to more than 40 countries.

| | |
|---|---|
| Address | No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China |
| Phone and WhatsApp | +86-189-2135-9659 |
| Email | sales@steelforgepieces.com |
| Website | https://www.steelforgepieces.com/ |
| Maximum rolled ring OD | 2,500 mm |
| Maximum forged disc diameter | 1,800 mm |
| Maximum shaft length | 8 m |
| Maximum single-piece weight | 8,000 kg |
| Round bar range | 25-500 mm diameter |
| Certification | EN 10204 3.1 standard, 3.2 third-party witnessed on request |
| Typical lead time | 10-14 weeks |

## Trademark notice

HAYNES® and HASTELLOY® are registered trademarks of Haynes International, Inc. UDIMET® and INCONEL® are registered trademarks of Special Metals Corporation. Material made by those companies and sold under those brand names is theirs. Material produced by Jiangyin Jiangnan Metal Co., Ltd. is correctly described as CoCr22NiW / UNS R30188 / W.Nr. 2.4683 / AMS 5772, the same generic chemistry, manufactured independently. We are not affiliated with, sponsored by, or endorsed by any trademark holder named on this page. All other product names and trademarks referenced belong to their respective owners.

---
## Quick answer

**CoCr22NiW is the cobalt-nickel-chromium-tungsten superalloy designated UNS R30188 and Werkstoff 2.4683, procured for bar, forgings and rings under AMS 5772.** Nominal chemistry is 39 % cobalt, 22 % nickel, 22 % chromium and 14 % tungsten with about 0.03 % lanthanum. It is solid-solution strengthened, not age hardened, so it is supplied solution heat treated and is used where a part must survive prolonged oxidising combustion gas up to 1095 °C: combustors, transition ducts, flame holders and afterburner hardware.

**Jiangyin Jiangnan Metal Co., Ltd.**, an open-die forging factory in Jiangyin, Jiangsu, China, manufactures CoCr22NiW / UNS R30188 forgings to AMS 5772: seamless rolled rings to 2,500 mm OD, discs to 1,800 mm, shafts to 8 m, and single pieces to 8,000 kg, supplied with EN 10204 3.1 certification as standard and 3.2 third-party witnessed release on request. Contact [sales@steelforgepieces.com](mailto:sales@steelforgepieces.com) or [0086-189-2135-9659](tel:+8618921359659).

## What is CoCr22NiW?

CoCr22NiW is a wrought cobalt-base superalloy strengthened by dissolved tungsten rather than by precipitation. There is no γ′ or γ″ phase to over-age, so it holds its properties through very long high-temperature exposures instead of gradually softening. That behaviour is what keeps it serviceable in the hottest sections of gas turbines.

The name follows European chemical-symbol convention: Co base, Cr 22 % chromium, plus Ni and W as the other major additions. The role of each element:

**Cobalt: the matrix**

Gives an FCC matrix with higher melting point and better sulfidation and molten-salt resistance than a nickel matrix, plus excellent galling resistance.

**Chromium: oxidation resistance**

Forms the protective Cr₂O₃ scale. At 22 % there is enough chromium reservoir to re-heal the scale through thousands of thermal cycles.

**Tungsten: strength**

The main solid-solution strengthener. It is also why the alloy is dense (8.98 g/cm³) and why it work hardens so quickly during forging.

**Nickel: stability**

Stabilises the FCC structure and improves fabricability and weldability compared with lower-nickel cobalt alloys such as UNS R30605.

**Lanthanum: scale adhesion**

The rare-earth addition that keeps the chromia scale keyed to the metal under thermal cycling. This is the single biggest difference from Alloy 25 / UNS R30605.

**Carbon: grain control**

Forms carbides that pin grain boundaries during forging and solution treatment, contributing to creep resistance.

### Where CoCr22NiW sits on the temperature scale

| Metal temperature | What happens there |
|---|---|
| 650 °C (1200 °F) | Creep becomes the design driver rather than yield strength |
| 870 °C (1600 °F) | Typical combustor liner metal temperature |
| 980 °C (1800 °F) | Practical limit for meaningfully loaded parts |
| 1095 °C (2000 °F) | Oxidation limit for prolonged exposure |
| 1163-1191 °C | Solution heat treatment range |
| 1175 °C (2150 °F) | Hot working start temperature |

Below 650 °C a cheaper stainless steel will usually do the same job. Between 650 °C and 980 °C CoCr22NiW earns its cost on creep strength. Above 980 °C it is chosen for oxidation and hot-corrosion survival rather than for load capacity.

The solid-solution mechanism has two practical consequences. There is **no aging step**, so CoCr22NiW forgings ship solution heat treated and there is no H-condition or precipitation cycle to specify. And the alloy **work hardens rapidly**, so forging schedules need frequent reheats and machining needs rigid setups and positive feed.

The alloy also has a limitation worth stating plainly. After thousands of hours between roughly 650 °C and 870 °C, a Co₂W Laves phase precipitates and reduces room-temperature ductility and impact toughness. CoCr22NiW tolerates this far better than the earlier UNS R30605, but for a part that must stay tough after a decade in service, a nickel alloy such as [UNS N06230](https://www.steelforgepieces.com/Nickel-Alloy/Haynes-230.html) is a better answer. We will say so at quotation rather than sell the wrong grade.

## What are the equivalent designations for CoCr22NiW?

Engineers reach this alloy through half a dozen different names depending on which standards body, OEM or datasheet they started from. Every designation in the table below refers to the **same chemistry**, and Jiangyin Jiangnan Metal Co., Ltd. accepts purchase orders under any of them, supplying UNS R30188 / AMS 5772 material with a multi-designation certificate.

*Table 1. CoCr22NiW equivalent designations and specifications*

| Body / region | Designation | Scope and notes |
|---|---|---|
| EU chemical name | **CoCr22NiW** | European chemical-symbol style name, used as the title of this page |
| USA · UNS | **R30188** | Generic Unified Numbering System designation. Use this on POs. |
| Germany · Werkstoff | **2.4683** | DIN material number used across European drawings |
| USA · AMS (bar, forgings, rings) | **AMS 5772** | The dominant procurement spec for forgings: chemistry, solution treatment, mechanicals, testing |
| USA · AMS (sheet, strip, plate) | AMS 5608 | Flat product; the form most combustor liners are cut from |
| USA · AMS (welding wire) | AMS 5801 | Bare welding rod and wire, matching composition |
| USA · MMPDS | Chapter 6.4.2 | Statistically derived allowables for airframe and engine design |
| Common trade names | HAYNES® 188 · UDIMET® 188 · Alloy 188 | *Registered trademarks of their owners. We supply the generic equivalents listed above, not branded product.* |
| OEM specifications | GE B50A712 · B50TF59 · B50TF74 (and equivalents) | Customer specs frequently flowed down with this grade. Confirm the exact revision on your PO. We manufacture to the revision stated in the contract. |
| Delivery standard | DIN / EN | European orders are commonly placed against the DIN material number 2.4683 with EN delivery and inspection documents |
| Certification | EN 10204 3.1 / 3.2 | 3.1 mill certificate standard; 3.2 issued through a client-nominated body (Lloyd's, DNV, BV, ABS, TÜV) |

Verify the specification revision in force at your contract date. Standards are periodically re-issued and a revision letter change can alter test requirements even when the chemistry is unchanged.

## What is the chemical composition of CoCr22NiW?

The table gives the AMS 5772 / UNS R30188 specification limits alongside the nominal aim chemistry. Cobalt is the balance rather than a controlled range, so on a certificate you will see it reported as the remainder after every other element is analysed.

*Table 2. CoCr22NiW / UNS R30188 chemical composition, weight %*

| Element | Min | Max | Nominal | Metallurgical role |
|---|---|---|---|---|
| Cobalt (Co) | — | — | **39 bal.** | FCC matrix; sulfidation and molten-salt resistance; galling resistance |
| Nickel (Ni) | 20.0 | 24.0 | 22 | Stabilises the FCC structure; improves fabricability and weldability |
| Chromium (Cr) | 20.0 | 24.0 | 22 | Forms the protective Cr₂O₃ scale; hot-corrosion resistance |
| Tungsten (W) | 13.0 | 15.0 | 14 | Primary solid-solution strengthener; raises creep strength and density |
| Iron (Fe) | — | 3.0 | ≤3 | Residual from raw material; capped to protect oxidation behaviour |
| Manganese (Mn) | — | 1.25 | ≤1.25 | Deoxidiser |
| Silicon (Si) | 0.20 | 0.50 | 0.35 | Deoxidiser; small contribution to oxidation resistance |
| Carbon (C) | 0.05 | 0.15 | 0.10 | Carbide formation; grain-boundary pinning and creep strength |
| Lanthanum (La) | 0.02 | 0.12 | 0.03 | **The defining addition.** Keys the oxide scale to the substrate under thermal cycling |
| Boron (B) | — | 0.015 | ≤0.015 | Grain-boundary strengthening |
| Phosphorus (P) | — | 0.020 | — | Impurity |
| Sulfur (S) | — | 0.015 | — | Impurity; kept low to protect hot ductility during forging |
| Limits per AMS 5772 / UNS R30188. Confirm against the revision cited on your purchase order. Jiangyin Jiangnan Metal reports full elemental analysis by optical emission spectrometry on every EN 10204 certificate. | - | - | - | - |

## What are the mechanical properties of CoCr22NiW?

CoCr22NiW is supplied solution heat treated. There is no aging condition to choose, so the numbers below apply to material in the as-supplied state. Values are typical for hot-worked and solution-annealed product; AMS 5772 minimums, which are what your certificate is judged against, sit below these figures.

*Table 3. Typical tensile properties, solution annealed*

| Test temp °C | °F | 0.2 % yield MPa | ksi | UTS MPa | ksi | Elongation % |
|---|---|---|---|---|---|---|
| 20 (RT) | 68 | 483 | 70 | 991 | 144 | 51 |
| 538 | 1000 | 315 | 46 | 832 | 121 | 60 |
| 649 | 1200 | 311 | 45 | 838 | 122 | 63 |
| 760 | 1400 | 301 | 44 | 580 | 84 | 86 |
| 871 | 1600 | 256 | 37 | 341 | 50 | 98 |
| 982 | 1800 | 132 | 19 | 188 | 27 | 103 |
| 1093 | 2000 | 66 | 10 | 96 | 14 | 87 |
| Typical values for hot-rolled and solution-annealed plate. Bar and heavy forged sections commonly test slightly lower; around 963 MPa tensile, 446 MPa yield and 55 % elongation is a representative annealed bar result. Design allowables should be taken from MMPDS 6.4.2 or the applicable AMS specification, never from typical data. | - | - | - | - | - | - |

Note the elongation column. Ductility *rises* with temperature, from about 50 % at room temperature to roughly 100 % at 871 °C. This is what makes a 14 % tungsten alloy formable at all, and the reason hot working must stay inside the recommended range.

### Hardness and impact

*Table 4. Typical hardness and Charpy V-notch impact, solution annealed*

| Property | Value | Condition |
|---|---|---|
| Hardness, bar | 96 HRBW | Solution annealed, room temperature |
| Hardness, plate | 98 HRBW | Solution annealed, room temperature |
| Typical grain size, bar | ASTM 3.5–7.5 | Per ASTM E112 |
| Charpy V-notch at 20 °C | 194 J (143 ft·lb) | Solution annealed plate |
| Charpy V-notch at −185 °C | 158 J (116 ft·lb) | Cryogenic; toughness is retained |
| Charpy V-notch at 705 °C | 145 J (107 ft·lb) | Elevated temperature |

## Creep and stress-rupture strength

Above about 650 °C, creep rather than yield governs design. The values below are approximate initial stresses producing 1 % creep in 1,000 hours in solution-annealed plate, the figure most often used for a first sizing pass.

*Table 5. Approximate stress for 1 % creep in 1,000 h, solution-annealed plate*

| Temperature °C | °F | Stress MPa | ksi | Design comment |
|---|---|---|---|---|
| 649 | 1200 | 241 | 35 | Still a structural material at this temperature |
| 704 | 1300 | 152 | 22 | Typical of hot static structure |
| 760 | 1400 | 100 | 14.5 | Transition-duct territory |
| 816 | 1500 | 64 | 9.3 | Load capacity falling quickly |
| 871 | 1600 | 44 | 6.4 | Liner and flame-holder regime |
| 927 | 1700 | 30 | 4.3 | Lightly loaded sheet hardware only |
| 982 | 1800 | 17 | 2.5 | Effectively self-supporting structure |
| Indicative values from published solution-annealed plate data; longer-duration figures involve extrapolation. Use these for feasibility screening only and take design allowables from MMPDS 6.4.2. | - | - | - | - |

Compared with solid-solution-strengthened nickel alloys such as UNS N06625 or N06002, CoCr22NiW carries meaningfully more stress at the same temperature, which often allows a thinner section. Against simple Ni-Cr and Fe-Ni-Cr heat-resisting alloys the margin is very large. Substituting CoCr22NiW commonly permits a substantial reduction in wall thickness, which is part of how the higher price per kilogram is recovered.

## What are the physical properties of CoCr22NiW?

*Table 6. CoCr22NiW / UNS R30188 physical properties*

| Property | Metric | Imperial | Condition |
|---|---|---|---|
| Density | 8.98 g/cm³ | 0.324 lb/in³ | Room temperature |
| Melting range | 1315–1410 °C | 2400–2570 °F | Solidus – liquidus |
| Modulus of elasticity | 232 GPa | 33.7 × 10⁶ psi | Room temperature, dynamic |
| Modulus at 800 °C | 171 GPa | 24.0 × 10⁶ psi | Dynamic |
| Shear modulus | 90 GPa | 13.0 × 10⁶ psi | Room temperature |
| Poisson's ratio | 0.30 | 0.30 | Room temperature |
| Thermal conductivity | 10.4 W/m·K | 72 Btu·in/ft²·h·°F | Room temperature |
| Thermal conductivity at 800 °C | 24.8 W/m·K | 174 Btu·in/ft²·h·°F | — |
| Mean coefficient of expansion | 12.1 × 10⁻⁶ /°C | 6.7 × 10⁻⁶ /°F | 25–100 °C |
| Mean coefficient of expansion | 15.5 × 10⁻⁶ /°C | 8.8 × 10⁻⁶ /°F | 25–800 °C |
| Electrical resistivity | 101 µΩ·cm | 39.6 µΩ·in | Room temperature |
| Specific heat | 403 J/kg·K | 0.096 Btu/lb·°F | Room temperature |
| Magnetic response | Non-magnetic | — | FCC matrix, solution annealed |

## How does CoCr22NiW resist oxidation, hot corrosion and sulfidation?

Environmental resistance is the usual reason this alloy is specified. Three separate mechanisms attack hot gas-path hardware. CoCr22NiW is unusually good at two of them and respectable at the third.

### Oxidation in air and combustion gas

CoCr22NiW can be used for long-term continuous exposure to oxidising air and combustion gas up to **1095 °C (2000 °F)**, with short excursions permitted above that. In comparative 1,000-hour flowing-air testing at 980 °C it shows very low metal loss, among the best of the wrought high-temperature alloys. Above roughly 1150 °C the advantage disappears and nickel alloys such as UNS N06230 pull ahead, so 1095 °C is a real ceiling rather than a conservative one.

Under cyclic burner-rig conditions the lanthanum addition shows its value most clearly: metal loss after 1,000 hours of 30-minute cycles at 980 °C is lower than for the common nickel alternatives, because the scale stays attached through each thermal cycle instead of spalling and re-forming at the expense of the chromium reservoir.

### Sulfate-deposit hot corrosion

Hot corrosion (sulfate deposits formed when sulfur in the fuel combines with ingested sodium chloride) is what destroys marine and industrial turbine hardware. CoCr22NiW has **excellent** resistance here, outperforming UNS N06625, N06002 and N06230 in standard 1,000-hour burner-rig tests at 900 °C with salt injection. For marine gas turbines and for engines burning higher-sulfur fuel, this is usually the deciding property.

### Gaseous sulfidation and molten chloride salts

The cobalt matrix gives good resistance to reducing sulfidising gas, where nickel alloys form low-melting nickel sulfide eutectics. CoCr22NiW also resists molten chloride salts well, so it appears in concentrated solar power receivers, molten-salt heat storage and chloride-salt process equipment. UNS R30605 is slightly better in gaseous sulfidation specifically. If that single mechanism dominates your application, say so and we will discuss both grades.

### Environmental resistance at a glance

| Mechanism | CoCr22NiW rating | Where it matters |
|---|---|---|
| Sulfate-deposit hot corrosion | Best in class | Marine turbines, high-sulfur fuel, salt-laden intake air |
| Cyclic oxidation to 1095 °C | Excellent | Lanthanum keeps the chromia scale adherent through thousands of start-stop cycles |
| Molten chloride salts | Excellent | CSP receivers, salt storage loops, chloride process equipment |
| Gaseous sulfidation | Good | Reducing H2S-bearing atmospheres. UNS R30605 edges ahead here |
| Water-vapour oxidation | Good | Steam-bearing combustion products, on par with the best nickel alloys |
| Long-term thermal stability | Fair | Laves phase after thousands of hours at 650-870 °C costs room-temperature toughness |

## How does CoCr22NiW compare with Alloy 25, 230, X and 625?

Five alloys compete for the same hot-section jobs. CoCr22NiW leads on hot corrosion and cyclic oxidation, UNS N06230 leads on long-term stability, and UNS N06625 leads on price and fabricability at lower temperatures.

*Table 7. CoCr22NiW compared with common high-temperature alloys*

| Property | CoCr22NiW R30188 | [Alloy 25 / L-605](https://www.steelforgepieces.com/Nickel-Alloy/Haynes-25.html) R30605 | [Alloy 230](https://www.steelforgepieces.com/Nickel-Alloy/Haynes-230.html) N06230 | [Alloy X](https://www.steelforgepieces.com/Nickel-Alloy/Hastelloy-X.html) N06002 | [Alloy 625](https://www.steelforgepieces.com/Nickel-Alloy/Inconel-625.html) N06625 |
|---|---|---|---|---|---|
| Base | Cobalt | Cobalt | Nickel | Nickel | Nickel |
| Nominal Cr / W | 22 / 14 | 20 / 15 | 22 / 14 | 22 / 0.6 | 22 / — |
| Rare-earth addition | **La 0.03 %** | None | La 0.02 % | None | None |
| Density g/cm³ | 8.98 | 9.13 | 8.97 | 8.22 | 8.44 |
| Max oxidising service °C | 1095 | 1095 | 1150 | 1095 | 980 |
| Cyclic oxidation | Excellent | Fair | Excellent | Good | Fair |
| Sulfate hot corrosion | **Excellent** | Very good | Good | Fair | Fair |
| Gaseous sulfidation | Good | **Very good** | Fair | Poor | Fair |
| Long-term thermal stability | Fair (Laves) | Poor | **Very good** | Fair | Fair (δ phase) |
| Creep strength 870 °C | Very good | Good | Very good | Good | Fair |
| Relative raw-material cost | 4–6 × | 4–6 × | 2.5–3.5 × | 2–3 × | 1 × baseline |
| **Choose it when…** | **Hot corrosion and cyclic oxidation dominate** | Sulfidising gas dominates; legacy or medical spec | Part must stay tough after very long service | General hot structure, cost-sensitive | Below ~980 °C; fabricability and cost matter most |
| Cost multiples are indicative raw-material ratios, not quotations. Cobalt and tungsten pricing moves independently of nickel, so request a current quotation. | - | - | - | - | - |

## How is CoCr22NiW forged and heat treated?

CoCr22NiW forges well, but only inside a narrow window. Two rules matter above all others: soak long enough that the whole section reaches temperature, and stop working before the piece cools into the work-hardening regime.

### Hot working

- **Start temperature 1175 °C (2150 °F)**, held long enough for the full cross-section to reach temperature. On heavy sections this is measured in hours, not minutes. A cold core is the most common cause of internal bursts in this grade.
- **Finish above roughly 1010 °C.** Below that the alloy work hardens sharply and the risk of cracking rises steeply. Reheat rather than push one more blow.
- **Take moderate reductions with frequent reheats.** Tungsten-strengthened cobalt alloys do not tolerate heavy single-stroke reduction the way carbon steel does.
- **Target a forging ratio of at least 4:1** to break down the as-cast structure and produce the grain flow that AMS 5772 acceptance depends on.
- **Anneal and cool rapidly after all hot or cold work** to restore the best balance of properties.

### Solution heat treatment

The standard condition is **solution treatment at 1177 °C ± 14 °C (2150 °F ± 25 °F), that is 1163–1191 °C, soaked for a time appropriate to section thickness, then rapid air cooled or water quenched.** Rapid cooling is not optional. It is what keeps the carbides in solution. Bright-annealed product is cooled in hydrogen.

### Strengthening by cold work

Although CoCr22NiW cannot be precipitation hardened, it responds strongly to cold deformation, which is the only route to higher strength in this grade. Cold reduction raises yield strength dramatically: roughly 20 % reduction takes 0.2 % yield from about 460 MPa to 915 MPa, and 40 % reduction takes it beyond 1,200 MPa, at the cost of elongation falling from about 54 % to under 10 %.

The cold-worked structure can be further strengthened by **aging near 540 °C (1000 °F) for 4 to 16 hours**. This is a stabilising treatment on a cold-worked structure, not a precipitation-hardening cycle on solution-annealed material. The distinction causes real confusion on drawings. If you need CoCr22NiW in a cold-worked and aged condition rather than solution annealed, state it explicitly on the order, because it is not the default supply condition.

### Process route at Jiangyin Jiangnan Metal

*Table 8. CoCr22NiW forging process route and control points*

| Stage | Operation | Control point |
|---|---|---|
| 1 | Melt and billet supply | Vacuum melt route: VIM + ESR, or VIM + ESR + VAR where the specification requires triple melt. EAF + VOD + ESR is used where the customer specification permits it. Heat number traced; full chemistry verified against AMS 5772, including lanthanum, before release to the shop |
| 2 | Soak | 1175 °C, hold to section, recorded on the furnace chart |
| 3 | Open-die forging or ring rolling | Finish above 1010 °C; reduction ≥4:1; multiple reheats logged |
| 4 | Solution heat treatment | 1163–1191 °C, rapid cool / water quench; ±5 °C furnace uniformity |
| 5 | Rough machining | Stock allowance agreed on the drawing; carried out before final NDE |
| 6 | NDE | Ultrasonic per ASTM A388, EN 10228-3, SEP 1921 or AMS 2154 class as ordered; penetrant per ASTM E1417 |
| 7 | Mechanical testing | Tensile per ASTM E8 / E21, hardness, grain size per ASTM E112 |
| 8 | Certification and dispatch | EN 10204 3.1 or 3.2; multi-designation certificate; marked, preserved and packed |

## Welding and machining CoCr22NiW

### Welding

CoCr22NiW is readily welded by GTAW (TIG), GMAW (MIG), SMAW, electron beam and resistance welding, and it behaves well under restraint. Practical guidance:

- **Filler:** matching UNS R30188 composition (AMS 5801) for most joints. For sections above about 9.5 mm, a nickel-chromium-tungsten-molybdenum filler is often preferred.
- **Preheat:** not required. Room-temperature shop conditions are normal.
- **Interpass temperature:** keep below about 95 °C (200 °F).
- **Post-weld heat treatment:** not generally required.
- **Cleanliness:** remove all grease, marking crayon and sulfur-bearing residue before welding, and keep copper and copper-bearing tooling away from the joint.
- **Avoid submerged arc welding.** High heat input and slow cooling raise restraint and promote cracking.

### Machining

Machining CoCr22NiW is closer to machining a nickel superalloy than a stainless steel, and the work-hardening behaviour dominates. What works:

- Rigid setup, minimum overhang, sharp positive-rake carbide tooling.
- **Never dwell.** Maintain positive feed at all times. A rubbing tool glazes the surface, and the next pass has to cut through a work-hardened layer.
- Low cutting speed with heavy feed, generous flood coolant.
- Peck-drilling cycles for depth, and roughing done before final solution treatment where the geometry allows.
- Allow for tool life measured in minutes, not hours, and budget machining time accordingly. It is a real cost line on any CoCr22NiW component.

We supply CoCr22NiW rough-machined or finish-machined to drawing. On complex geometry it is usually cheaper to have the forging house machine the part than to ship an oversized forging and machine away expensive cobalt alloy elsewhere.

## CoCr22NiW forging capability at Jiangyin Jiangnan Metal

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China, with 460 employees including 9 senior engineers and 32 intermediate engineers. We forge CoCr22NiW / UNS R30188 to AMS 5772 alongside our nickel alloy and stainless steel programmes.

### Product forms available in CoCr22NiW

Seamless rolled rings, Contoured rolled rings, Forged discs & hubs, Combustor casing rings, Transition duct rings, Forged shafts, Forged blocks & blanks, Sleeves & bushings, Hollow bars, Trepanned billets, Forged flanges, Round bar 25–500 mm Ø, Tube sheets, Forged tubes & pipes, Spindles, Gears, Nozzles, Valve stems & seat rings, Near-net-shape forgings to drawing.

### Equipment used on CoCr22NiW work

**4,500 t hydraulic press**

Blocks, discs, heavy sections. Slow controlled strokes suit a work-hardening cobalt alloy better than hammer work.

**1 / 3 / 6 / 9 t open-die hammers**

Shafts, bars and cogging operations where reduction per blow must stay moderate.

**3 m and 6 m ring mills**

Seamless and contoured rings to 2,500 mm OD, the dominant form for combustor and duct hardware.

**Solution treatment furnaces**

Charted cycles at 1163–1191 °C with rapid cooling and water quench facilities.

**Ultrasonic & magnetic particle**

UT to ASTM A388 or AMS 2154 class; penetrant inspection for this non-magnetic alloy.

**Chemistry & mechanical test**

Optical emission spectrometer, universal testing machine, impact tester, hardness tester and metallographic microscope in house.

## What product forms and industries does CoCr22NiW cover?

Jiangyin Jiangnan Metal Co., Ltd. produces CoCr22NiW / UNS R30188 in every open-die and ring-rolled form below, to customer drawing. The dominant real-world use of this alloy is hot gas-path hardware; the other forms and industries listed here are supplied on request where a project specifies this grade.

### Forged product forms

*Table 10. CoCr22NiW forged product forms and size envelopes*

| Form | Typical envelope | Notes |
|---|---|---|
| [Seamless rolled rings & forged rings](https://www.steelforgepieces.com/Forging-Rings/Forging-Ring.html) | to 2,500 mm OD | The most common CoCr22NiW form: combustor casings, transition duct rings, seal rings |
| Contoured rolled rings | to 2,500 mm OD | Profiled section reduces machining on flanged and stepped rings |
| [Forged discs, disks & hubs](https://www.steelforgepieces.com/Forged-Disks/Forged-Disk.html) | to 1,800 mm Ø | Solid or bored; rough or finish machined |
| [Forged shafts & spindles](https://www.steelforgepieces.com/Forging-Shafts/) | to 8 m length | Solid or trepanned; stepped profiles to drawing |
| Forged blocks, blanks & die blocks | to 8,000 kg | Input stock for customer machining |
| Forged flanges | to 2,500 mm OD | Weld-neck, blind and custom profiles |
| Round bars, flat bars & hex bars | 25–500 mm Ø | Cut to length; the usual feedstock for machining shops |
| Sleeves, bushings & hollow bars | to 2,500 mm OD | Trepanned or bored from solid, depending on bore size |
| Tube sheets | to 1,800 mm Ø | Drilled to customer pattern on request |
| Forged tubes & pipes | to 8 m length | Bored and machined from forged hollows, not extruded |
| Forged gears & gear blanks | to 1,800 mm Ø | Blank forged with grain flow to tooth profile |
| [Valve stems, bodies, blocks & seat rings](https://www.steelforgepieces.com/Forged-Valve-Parts/Forged-Valve-Seat-Rings.html) | to drawing | For high-temperature and erosive valve service |
| [Eccentric shafts & crankshafts](https://www.steelforgepieces.com/Forging-Eccentric-Shafts/Forging-Eccentric-Shaft.html) | to 8 m length | Grain flow following the throw geometry |
| Nozzles, manifolds, wheels & rolls | to drawing | Near-net-shape where the geometry allows |
| Near-net-shape forgings | to drawing | Worth specifying on CoCr22NiW, because machining stock is expensive metal |
| Size envelopes are our open-die capability. Cobalt superalloy limits can be lower than carbon-steel limits on the same equipment, so confirm the specific part with our engineering team before you design to these figures. | - | - |

### Industries we ship CoCr22NiW into

**Aero & industrial gas turbines**

Combustor cans and liners, transition ducts, spray bars, flame holders and afterburner liners. These are the applications the alloy was developed for.

**Power generation**

Hot-section hardware in power generators and gas compressor drives, especially on higher-sulfur fuel or coastal sites where hot corrosion dominates.

**Oil & gas, offshore**

Subsea and deepwater production systems, wellhead and Christmas tree components, and flare and incineration hardware where combustion products are aggressive.

**Valves & flow control**

Ball, gate, globe, plug and check valve internals, strainers and seat rings for high-temperature or erosive service.

**Pressure equipment**

Pressure vessels, air receivers, shell-and-tube heat exchangers and reactor internals operating in the high-temperature range where stainless steel is no longer viable.

**Rotating equipment**

Industrial air compressors, nitrogen generators, gearboxes and power transmission components in hot or corrosive duty.

**Chemical & process**

Chemical and plunger pump components, processing units, crystalliser equipment, and pulp, paper, pharmaceutical and biochemical plant hardware.

**Marine & heavy machinery**

Shipbuilding and heavy machinery components where salt-laden air and combustion products meet high metal temperature.

## Quality assurance, testing and certification

CoCr22NiW is almost always bought for a safety-critical hot section, so the certificate matters as much as the metal. Every UNS R30188 order from Jiangyin Jiangnan Metal Co., Ltd. is released against the following.

*Table 11. Standard testing and documentation for CoCr22NiW forgings*

| Check | Standard / method | Status |
|---|---|---|
| Chemical analysis | Optical emission spectrometry, full elemental report against AMS 5772 limits including lanthanum | Every heat |
| Tensile test | ASTM E8 / E8M at room temperature; ASTM E21 at elevated temperature when ordered | Every lot |
| Hardness | Rockwell B with tungsten indenter, or Brinell | Every lot |
| Grain size | ASTM E112 | Every lot |
| Ultrasonic inspection | ASTM A388, EN 10228-3, SEP 1921, or AMS 2154 class as specified on the order | Standard on forgings |
| Penetrant inspection | ASTM E1417 Type I, method and sensitivity level per order | On request / aerospace |
| Heat treatment records | Furnace chart for the final solution cycle, lot traceable | Every lot |
| Charpy impact | ASTM E23 | On request |
| Certificate | EN 10204 3.1 as standard; 3.2 with third-party witness (Lloyd's, DNV, BV, ABS, TÜV) | Every order |
| Marking | Heat number, specification, drawing number and part number, vibro-etched on a non-functional surface | Every piece |

### Hold points and non-conformance

CoCr22NiW orders run through mandatory QA hold points: raw material chemistry release, forging temperature compliance, post-forging ultrasonic inspection, solution treatment chart approval, mechanical test acceptance, and final dimensional and NDE release. Customers may witness any stage at no charge. Any out-of-specification finding raises a formal non-conformance report within 24 hours, and no rework, regrade or concession is applied until the customer has seen the NCR and the proposed disposition. Shipping and test documentation is retained for ten years.

## Where is CoCr22NiW used?

Almost every application shares the same profile: high metal temperature, an aggressive combustion environment and thermal cycling. Load is rarely the limiting factor; survival in the environment is.

**Combustion cans and liners**

The classic application. Metal temperatures around 870 °C, constant thermal cycling, and sulfate deposits from fuel sulfur. This is the combination CoCr22NiW was developed for.

**Transition ducts**

Rings and formed sections carrying combustor exit gas to the turbine inlet. Rolled rings in this grade are one of our most common CoCr22NiW forms.

**Afterburner components**

Flame holders, liners and spray-bar hardware where short excursions well above 1000 °C are routine.

**Industrial gas turbine hot section**

Combustor baskets, transition pieces and support hardware, especially on units burning higher-sulfur fuel or sited near the coast.

**Marine gas turbines**

Salt-laden intake air makes sulfate hot corrosion the dominant failure mode, which is where this alloy's advantage is largest.

**Industrial furnace and heat-treat fixtures**

Retorts, muffles, radiant tubes, fixtures and rotating hardware cycling to 1000 °C+.

**Molten chloride salt systems**

Concentrated solar power receivers, thermal storage loops and salt handling components.

**High-temperature fasteners and seals**

Bolting, seal rings and springs where oxidation resistance must be combined with retained strength at temperature.

Component photographs: replace the placeholders in the source with real shop photographs of CoCr22NiW rings and discs. Genuine process photographs with descriptive file names and alt text are one of the strongest trust signals a supplier page can carry.

## How to specify a CoCr22NiW forging order

CoCr22NiW has no aging condition to choose, so specification is simpler than for a precipitation-hardening grade. Six items cover almost every order.

1. **State the generic designation.** Write UNS R30188 / AMS 5772, or CoCr22NiW / W.Nr. 2.4683 for European drawings. Avoid ordering by a trademarked brand name alone, since that can only be filled by the trademark holder.
2. **Specify the condition.** Normally solution heat treated per AMS 5772, 1163–1191 °C, rapid cool. State explicitly if you want the part supplied as-forged for your own heat treatment.
3. **Provide the drawing or ring dimensions.** For rings, give OD, ID, height and any contour; for discs and shafts, give the finished envelope plus the machining stock you want left.
4. **Define NDE.** Ultrasonic acceptance class per ASTM A388 or AMS 2154, and penetrant inspection per ASTM E1417 with the method and sensitivity level. Say which surfaces are critical.
5. **State the certificate.** EN 10204 3.1 or 3.2, plus any OEM specification that must appear on it, and any additional testing such as elevated-temperature tensile, Charpy or grain size.
6. **Give quantity, delivery target and destination.** Cobalt and tungsten procurement dominates lead time, so an early indication of quantity lets us secure raw material at a better price.

## Common CoCr22NiW specification mistakes

**1. Ordering by trademark alone**

A PO that names only a branded alloy can legally be filled only by that brand's owner. **Fix:** specify UNS R30188 / AMS 5772 / W.Nr. 2.4683.

**2. Confusing CoCr22NiW with L-605**

UNS R30188 and UNS R30605 are different alloys with different nickel and lanthanum contents. **Fix:** always write the UNS number on the drawing.

**3. Expecting an aging condition**

There is no H-condition here, because the alloy is solid-solution strengthened. **Fix:** specify the solution treatment, not an aging cycle.

**4. Ignoring long-term embrittlement**

Parts that must stay tough after years at 650–870 °C may be the wrong application. **Fix:** state the design life and we will review UNS N06230 alongside.

**5. Specifying magnetic particle inspection**

CoCr22NiW is non-magnetic, so MPI simply will not work on it. **Fix:** specify liquid penetrant per ASTM E1417 instead.

**6. Under-budgeting machining**

Rapid work hardening means slow cutting and short tool life; machining can rival the forging cost. **Fix:** get the forging near net shape, or have us machine it.

**7. Omitting the lanthanum check**

Some low-cost material is supplied without the rare-earth addition and loses cyclic oxidation life. **Fix:** require La 0.02–0.12 % reported on the certificate.

**8. Assuming nickel-alloy lead times**

Cobalt and tungsten procurement is slower and more volatile than nickel. **Fix:** plan 10–14 weeks, and release long-lead raw material early on repeat programmes.

## Drawing callout template for CoCr22NiW

Copy this block into the material note on your drawing. It removes most of the ambiguity that causes RFQ back-and-forth.

```
MATERIAL:      CoCr22NiW / UNS R30188 / W.Nr. 2.4683
               per AMS 5772 (bar, forgings and rings)

CONDITION:     Solution heat treated 1163-1191 C (2125-2175 F),
               rapid cool or water quench. Furnace chart required.

CHEMISTRY:     Per AMS 5772. Lanthanum 0.02-0.12 % shall be
               reported on the certificate.

FORGING:       Hot work from 1175 C (2150 F). Finish above 1010 C.
               Forging reduction ratio >= 4:1.

GRAIN SIZE:    Report per ASTM E112.

NDE:           UT per ASTM A388 [class ____]
               (or AMS 2154 class ____ for aerospace)
               (or EN 10228-3 quality class ____, or SEP 1921 class ____)
               PT per ASTM E1417 Type I, method ____, sensitivity ____
               NOTE: material is non-magnetic - do not specify MT.

TESTING:       Tensile per ASTM E8 at room temperature.
               [Optional] Elevated tensile per ASTM E21 at ____ C.
               [Optional] Charpy V-notch per ASTM E23.

CERTIFICATE:   EN 10204 3.1  [or 3.2 with third-party witness]
               List all equivalent designations satisfied.

MARKING:       Heat number, specification, drawing and part number,
               vibro-etched on a non-functional surface.
```

## Glossary

****CoCr22NiW****
: European chemical-symbol name for the cobalt-nickel-chromium-tungsten superalloy designated UNS R30188.

****UNS R30188****
: Unified Numbering System designation for this alloy. The R3xxxx series covers cobalt-base alloys.

****W.Nr. 2.4683****
: German Werkstoff material number for the same chemistry, used on European drawings.

****AMS 5772****
: SAE Aerospace Material Specification covering this alloy as bar, forgings and rings. It is the controlling document for most forging orders.

****AMS 5608****
: SAE specification covering the same alloy as sheet, strip and plate.

****Solid-solution strengthening****
: Strengthening by dissolved atoms, here mainly tungsten, distorting the lattice and impeding dislocation motion. Unlike precipitation hardening, there is no aging step and no over-aging in service.

****Laves phase (Co₂W)****
: An intermetallic that precipitates after long exposure around 650–870 °C. It reduces room-temperature ductility and impact toughness while leaving high-temperature strength largely intact.

****Sulfate-deposit hot corrosion****
: Accelerated attack when sulfur from fuel and sodium from ingested salt form molten sulfate deposits on hot metal. The dominant degradation mode in marine and coastal turbines.

****Lanthanum addition****
: A rare-earth element added at roughly 0.03 % that improves adhesion of the protective chromia scale under thermal cycling. Its presence is the defining difference from UNS R30605.

****EN 10204 3.1 / 3.2****
: Certificate types. 3.1 is issued by the manufacturer's own independent quality department; 3.2 adds a third-party or customer inspector who witnesses testing and countersigns.

****MMPDS****
: Metallic Materials Properties Development and Standardization, the source of statistically derived design allowables for aerospace. This alloy appears in chapter 6.4.2.

## Frequently asked questions about CoCr22NiW

### What is CoCr22NiW?

CoCr22NiW is a cobalt-nickel-chromium-tungsten solid-solution superalloy, nominally 39 % cobalt, 22 % nickel, 22 % chromium and 14 % tungsten with a small lanthanum addition. Its generic designations are UNS R30188 and Werkstoff 2.4683, and bar, forgings and rings are procured to AMS 5772. It is used for long-term service in oxidising combustion gas up to about 1095 °C.

### Is CoCr22NiW the same as Alloy 188?

Yes. CoCr22NiW is the European chemical-symbol style name for the same alloy known generically as Alloy 188, UNS R30188 and Werkstoff 2.4683. HAYNES® 188 is a registered trademark of Haynes International, Inc. Jiangyin Jiangnan Metal Co., Ltd. is not affiliated with that company and supplies the material under the generic designations UNS R30188 / AMS 5772 / 2.4683.

### What is the UNS number for CoCr22NiW?

The UNS number for CoCr22NiW is **R30188**. The equivalent German Werkstoff number is 2.4683, and the aerospace material specification covering bar, forgings and rings is AMS 5772. Sheet, strip and plate are covered by AMS 5608 and welding wire by AMS 5801.

### What is the maximum service temperature of CoCr22NiW?

CoCr22NiW is suitable for prolonged continuous exposure in oxidising air and combustion gas to approximately **1095 °C (2000 °F)**, and for short excursions above that. Useful load-carrying capability falls away rapidly above about 980 °C, so most stressed components are designed for 650–980 °C, with the higher figure reserved for lightly loaded sheet and liner hardware.

### Which specification covers CoCr22NiW forgings?

**AMS 5772** is the specification for CoCr22NiW bar, forgings and rings. It defines the chemistry limits, the solution heat treatment, mechanical property requirements and testing. Jiangyin Jiangnan Metal Co., Ltd. supplies UNS R30188 forgings certified to AMS 5772 with EN 10204 3.1 certificates as standard and 3.2 third-party witnessed certificates on request.

### At what temperature is CoCr22NiW forged?

CoCr22NiW is hot worked from about **1175 °C (2150 °F)**, soaked long enough for the whole section to reach temperature, and should not be worked below roughly 1010 °C because it work hardens rapidly. After forging it is solution heat treated at 1163–1191 °C and rapidly cooled or water quenched to restore ductility and dissolve carbides.

### What is the difference between CoCr22NiW (Alloy 188) and Alloy 25 (L-605)?

Both are cobalt-chromium-tungsten superalloys, but CoCr22NiW / UNS R30188 carries about 22 % nickel and a lanthanum addition, whereas [Alloy 25 / UNS R30605](https://www.steelforgepieces.com/Nickel-Alloy/Haynes-25.html) has about 10 % nickel and no lanthanum. The lanthanum markedly improves oxide scale adhesion, so CoCr22NiW has better oxidation resistance and better long-term thermal stability. Alloy 25 retains slightly better gaseous sulfidation resistance and remains common in medical and legacy engine hardware.

### What is the density of CoCr22NiW?

The density of CoCr22NiW (UNS R30188) is approximately **8.98 g/cm³**, or 0.324 lb/in³. That is noticeably higher than nickel superalloys such as UNS N06625 at 8.44 g/cm³, which matters when a component is weight-critical rather than temperature-critical.

### Is CoCr22NiW weldable?

Yes. CoCr22NiW is readily welded by GTAW, GMAW, SMAW, electron beam and resistance welding, using matching UNS R30188 filler for most joints. Preheat is not required, interpass temperature should stay below about 95 °C, and post-weld heat treatment is not normally needed. Submerged arc welding is not recommended because the high heat input and slow cooling promote cracking.

### What sizes of CoCr22NiW forgings can Jiangyin Jiangnan Metal supply?

Jiangyin Jiangnan Metal Co., Ltd. produces CoCr22NiW seamless rolled rings to 2,500 mm outside diameter, forged discs to 1,800 mm diameter, forged shafts and long bars to 8 m, blocks and blanks, and round bar from 25 mm to 500 mm diameter, with single-piece weights to 8,000 kg. All parts are supplied solution heat treated unless the order states otherwise.

### What is the lead time for CoCr22NiW forgings?

Typical lead time for CoCr22NiW / UNS R30188 forgings from Jiangyin Jiangnan Metal Co., Ltd. is **10 to 14 weeks** from order confirmation, driven mainly by cobalt and tungsten raw material procurement and the vacuum melt route. Orders requiring EN 10204 3.2 third-party witnessed release typically add two to three weeks.

### Can CoCr22NiW be strengthened by heat treatment?

Not by precipitation hardening. CoCr22NiW is solid-solution strengthened, so there is no aging condition equivalent to an H-number and it is supplied solution heat treated. It can, however, be strengthened substantially by **cold deformation**: about 20 % cold reduction roughly doubles the 0.2 % yield strength, and the cold-worked structure can be further stabilised by aging near 540 °C (1000 °F) for 4 to 16 hours. State this on the order if you need it, because solution annealed is the default supply condition.

### What ultrasonic inspection standards do you work to for CoCr22NiW?

Jiangyin Jiangnan Metal Co., Ltd. inspects CoCr22NiW / UNS R30188 forgings ultrasonically to **ASTM A388, EN 10228-3, SEP 1921 or AMS 2154**, whichever the order specifies, and issues the results on the EN 10204 3.1 or 3.2 certificate. Because the alloy is non-magnetic, surface inspection is by liquid penetrant per ASTM E1417. Magnetic particle inspection will not work on this grade.

### Why does CoCr22NiW cost more than nickel superalloys?

Cost is dominated by raw material. CoCr22NiW contains roughly 39 % cobalt and 14 % tungsten, both of which trade well above nickel, and it is vacuum melted. Yield losses are also higher than for nickel alloys because the material work hardens quickly and needs more reheats. Expect CoCr22NiW forgings to run several times the cost of an equivalent UNS N06625 part.

## Technical references

Chemistry, mechanical, physical and environmental data on this page are drawn from published specifications and engineering references. Test results on our certificates are independent and traceable to calibrated equipment in our own laboratory.

1. AMS 5772, *Alloy Bars, Forgings, and Rings, 39.5Co – 22Cr – 22Ni – 14.5W – 0.07La*, SAE International.
2. AMS 5608, *Alloy Sheet, Strip, and Plate, Cobalt base, Solution Heat Treated*, SAE International.
3. AMS 5801, *Alloy Welding Wire, Cobalt base*, SAE International.
4. MMPDS, *Metallic Materials Properties Development and Standardization*, chapter 6.4.2 (UNS R30188), Battelle Memorial Institute.
5. ASM Handbook, Volume 1, *Properties and Selection: Irons, Steels, and High-Performance Alloys*, ASM International, cobalt-base superalloys.
6. ASM Handbook, Volume 14A, *Metalworking: Bulk Forming*, ASM International, forging of superalloys.
7. ASTM E8/E8M, *Standard Test Methods for Tension Testing of Metallic Materials*, ASTM International.
8. ASTM E21, *Standard Test Methods for Elevated Temperature Tension Tests of Metallic Materials*, ASTM International.
9. ASTM E23, *Standard Test Methods for Notched Bar Impact Testing of Metallic Materials*, ASTM International.
10. ASTM E112, *Standard Test Methods for Determining Average Grain Size*, ASTM International.
11. ASTM A388/A388M, *Standard Practice for Ultrasonic Examination of Steel Forgings*, ASTM International.
12. ASTM E1417/E1417M, *Standard Practice for Liquid Penetrant Testing*, ASTM International.
13. AMS 2154, *Inspection, Ultrasonic, Wrought Metals, Process For*, SAE International.
14. EN 10204:2004, *Metallic products. Types of inspection documents*, CEN, Brussels.
15. Haynes International, *HAYNES® 188 alloy* technical brochure and datasheet, published property data for UNS R30188. HAYNES® is a registered trademark of Haynes International, Inc.
16. Klarstrom, D.L., *The Development of Haynes 188 Alloy*, background on the lanthanum addition and its effect on oxide scale adhesion.

Standards are periodically revised. For procurement, always reference the revision in force at the contract date. All trademarks belong to their respective owners.

## Request a quote for CoCr22NiW forgings

Send us the grade, dimensions, quantity, certification level and, ideally, the service temperature and environment. We respond within 24 hours with price, lead time and confirmation of the applicable specifications.

**[sales@steelforgepieces.com](mailto:sales@steelforgepieces.com?subject=CoCr22NiW%20(UNS%20R30188)%20RFQ)**

Attach your drawing in PDF or STEP. Reply within 24 hours on working days.

**[0086-189-2135-9659](tel:+8618921359659)**

Also on [WhatsApp](https://wa.me/8618921359659) for quick technical questions.

**Jiangyin, Jiangsu, China**

No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City. Visitors welcome by appointment.
---

## Citation

This page is maintained as a public engineering reference for CoCr22NiW / UNS R30188. You are welcome to cite it, quote its data tables, and link to it. If you reference this data in a specification, report or article, please attribute it as follows.

> Jiangyin Jiangnan Metal Co., Ltd. (2026). *CoCr22NiW Forgings: Alloy 188, UNS R30188, W.Nr. 2.4683, AMS 5772. Composition, properties, forging and specification guide.* Retrieved from https://www.steelforgepieces.com/Nickel-Alloy/CoCr22NiW.html (last updated 15 August 2026).

### Key facts in one place

- CoCr22NiW = UNS R30188 = W.Nr. 2.4683 = Alloy 188. Bar, forgings and rings to AMS 5772; sheet, strip and plate to AMS 5608.
- Nominal chemistry: 39 % Co (balance), 22 % Ni, 22 % Cr, 14 % W, 0.03 % La, 0.10 % C.
- Density 8.98 g/cm³. Melting range 1315-1410 °C.
- Maximum prolonged oxidising service temperature 1095 °C (2000 °F).
- Hot worked from 1175 °C. Solution treated 1163-1191 °C and rapidly cooled.
- Solid-solution strengthened. No aging condition; supplied solution heat treated.
- Manufacturer: Jiangyin Jiangnan Metal Co., Ltd., No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Rolled rings to 2,500 mm OD, discs to 1,800 mm, single pieces to 8,000 kg. Contact sales@steelforgepieces.com, +86-189-2135-9659.

## Related grades

- [Alloy 25 / L-605 / UNS R30605](https://www.steelforgepieces.com/Nickel-Alloy/Haynes-25.html)
- [Alloy 230 / UNS N06230](https://www.steelforgepieces.com/Nickel-Alloy/Haynes-230.html)
- [Alloy X / UNS N06002](https://www.steelforgepieces.com/Nickel-Alloy/Hastelloy-X.html)
- [Alloy 625 / UNS N06625](https://www.steelforgepieces.com/Nickel-Alloy/Inconel-625.html)
- [Alloy 718 / UNS N07718](https://www.steelforgepieces.com/Nickel-Alloy/Inconel-718.html)
- [Multimet N155](https://www.steelforgepieces.com/Nickel-Alloy/Multimet-N155.html)
- [MP159](https://www.steelforgepieces.com/Nickel-Alloy/MP159.html)
- [MP35N](https://www.steelforgepieces.com/Nickel-Alloy/MP35N.html)
- [Waspaloy](https://www.steelforgepieces.com/Nickel-Alloy/Waspaloy.html)
- [Rene 41](https://www.steelforgepieces.com/Nickel-Alloy/Rene-41.html)
- [All nickel and cobalt alloys](https://www.steelforgepieces.com/Nickel-Alloy/)

## Product form pages

- [Open-die forging parts](https://www.steelforgepieces.com/Forging-Parts/Open-Die-Forging-Parts.html)
- [Forged and rolled rings](https://www.steelforgepieces.com/Forging-Rings/Forging-Ring.html)
- [Forged discs](https://www.steelforgepieces.com/Forged-Disks/Forged-Disk.html)
- [Forged valve seat rings](https://www.steelforgepieces.com/Forged-Valve-Parts/Forged-Valve-Seat-Rings.html)
- [Forged eccentric shafts](https://www.steelforgepieces.com/Forging-Eccentric-Shafts/Forging-Eccentric-Shaft.html)

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Property data on this page is published for general engineering information and is not design advice. The user is responsible for verifying suitability for a specific application. Standards are periodically revised; for procurement, always reference the revision in force at the contract date.

© 2026 Jiangyin Jiangnan Metal Co., Ltd. Open-die forging factory, Jiangyin, China.