UNS R30605 is a cobalt-chromium-tungsten-nickel superalloy. The nominal composition is balance cobalt with 20 % chromium, 15 % tungsten and 10 % nickel. The same material is also designated L605, Haynes 25, Alloy 25, W.Nr. 2.4964, CoCr20W15Ni, KC20WN and GH5605. It holds strength and resists oxidation and sulfidation in continuous service to about 980 °C (1800 °F). Typical uses are gas turbine combustor hardware, afterburner parts, high temperature springs and ASTM F90 surgical implants.
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No. 1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. We supply UNS R30605 as forged rings, seamless rolled rings, discs, round bars, flanges, shafts, sleeves, bushings, tube sheets and valve components. Material is melted by EAF + VOD + ESR, forged and solution annealed to AMS 5759, ultrasonically tested to ASTM A388, EN 10228-3 or SEP 1921, and supplied with EN 10204 3.1 or third-party 3.2 certification. For a quotation, contact sales@steelforgepieces.com or +86 189 2135 9659.
Designations and equivalent standards
This alloy carries different designations in different national systems and under several mill trade names. Every entry below refers to the same material.
| System | Designation | Notes |
|---|---|---|
| UNS (USA) | R30605 | Unified Numbering System |
| Trade names | Haynes® 25, Alloy 25, L-605, Udimet® L605, HS-25 | Haynes® is a trade mark of Haynes International; Udimet® of Special Metals |
| Werkstoff (DE) | 2.4964 | Short name CoCr20W15Ni |
| AFNOR (FR) | KC20WN | French designation |
| GB/T (CN) | GH5605 / GH605 | GB/T 14992 high temperature alloy series |
| AMS | AMS 5759 | Bars, forgings and rings, solution heat treated |
| AMS | AMS 5537 | Sheet, strip and plate |
| AMS | AMS 5796 / 5797 | Welding wire and covered electrodes |
| ASTM | ASTM F90 | Wrought Co-Cr-W-Ni alloy for surgical implants |
| ISO | ISO 5832-5 | Implant grade |
| BS (UK) | BS HR 40 | British designation |
| NACE | NACE MR0175 / ISO 15156-3 | Sour service qualification where specified |
Standards are listed for identification and are not tied to a specific edition or revision. Confirm the exact revision and any supplementary requirements on your purchase order.
Cobalt alloy or nickel alloy
UNS R30605 is a cobalt-base alloy. Cobalt is the balance element at roughly 51 %, and nickel content is only 9 to 11 %. The page sits in our nickel alloy section because buyers normally specify the two families together. Metallurgically the closest grades are Haynes 188 (R30188) and Multimet N155 (R30155).
Forged forms we supply in UNS R30605
All forms below are produced by open-die forging or ring rolling from solid stock.
| Forged form | Typical use |
|---|---|
| Forged rings and seamless rolled rings | Combustor casings, turbine shroud rings, bearing races, sealing rings |
| Forged discs and blanks | Turbine disc blanks, valve discs, closure plates |
| Forged round bars and billets | Machining stock for spindles, stems, fasteners, springs |
| Forged flanges | Pressure vessel and heat exchanger connections in hot corrosive duty |
| Forged shafts and eccentric shafts | Chemical and plunger pumps, gas compressors, gearboxes |
| Forged sleeves and bushings | Subsea and deepwater production hardware, wear surfaces |
| Forged tube sheets and hollow forgings | Shell and tube heat exchangers, air receivers |
| Forged valve bodies, bonnets and seat rings | Ball, gate, globe, check and plug valves in high temperature service |
| Forged nozzles, manifolds, blocks and gears | Process units, wellhead and Christmas tree assemblies, power transmission |
Related pages: forged valve seat rings, forged eccentric shafts, forged gears.
Chemical composition of UNS R30605
Composition limits per AMS 5759 for bars, forgings and rings, in weight percent.
| Element | Minimum | Maximum |
|---|---|---|
| Cobalt (Co) | Balance, nominally 51 | |
| Chromium (Cr) | 19.00 | 21.00 |
| Tungsten (W) | 14.00 | 16.00 |
| Nickel (Ni) | 9.00 | 11.00 |
| Manganese (Mn) | 1.00 | 2.00 |
| Carbon (C) | 0.05 | 0.15 |
| Iron (Fe) | – | 3.00 |
| Silicon (Si) | – | 0.40 |
| Phosphorus (P) | – | 0.040 |
| Sulfur (S) | – | 0.030 |
Melting route is electric arc furnace with vacuum oxygen decarburisation, followed by electroslag remelting. Tighter limits, such as a narrowed carbon band, can be agreed at enquiry.
Mechanical properties
Room temperature minimums for solution annealed forged product. Certified values come from test pieces representing the delivered forgings.
| Property | Symbol | Value |
|---|---|---|
| Tensile strength | Rm | ≥ 850 MPa |
| Yield strength, 0.2 % offset | Rp0.2 | ≥ 340 MPa |
| Elongation | A | ≥ 30 % |
| Brinell hardness | HB | ≤ 282 |
Behaviour at temperature
Tungsten and chromium in solid solution provide the strength, with some contribution from grain boundary carbides. The alloy is not precipitation hardenable and cannot be aged after welding to restore properties, so melt quality and forging practice govern how the part performs in service. Strength is retained above 1000 °C. The practical limit for continuous service, about 980 °C (1800 °F), is set by oxidation rather than by loss of strength.
Long exposure between roughly 760 and 925 °C precipitates Co2W Laves phase and secondary carbides. Room temperature ductility drops as a result. Other wrought superalloys behave the same way. Allow for it in design and in any repair or re-heat-treatment plan.
Physical properties and heat treatment
| Parameter | Typical value |
|---|---|
| Density | 9.13 g/cm³ (0.330 lb/in³) |
| Melting range | 1329 to 1410 °C (2425 to 2570 °F) |
| Magnetic response | Essentially non-magnetic in the annealed condition |
| Solution anneal | 1177 to 1232 °C (2150 to 2250 °F), rapid water quench or fast air cool |
| Hot working range | Heat to 1177 to 1232 °C. Stop forging before the material falls below about 1010 °C (1850 °F) |
| Stress relief after cold work | 400 to 450 °C, about 2 h, air cool |
| Strengthening mechanism | Solid solution. Work hardens rapidly, so intermediate anneals are used during complex forming |
| Welding | GTAW, GMAW, SMAW, electron beam and resistance welding with matching filler (AMS 5796). Submerged arc is not recommended |
Physical data are typical published values for the alloy, given for design guidance. They do not replace the certified test results issued with your order.
How we forge UNS R30605
A typical ring or shaft order runs through the following steps at our Jiangyin works. Since the alloy cannot be recovered by ageing, most of the control sits in the melting and forging stages.
- Melting and remeltingElectric arc furnace with vacuum oxygen decarburisation, then electroslag remelting. This gives a homogeneous ingot with controlled trace elements.
- Ingot conditioningHomogenisation and surface conditioning before the first heat, so the cast structure breaks down evenly.
- Open-die forging or ring rollingCogging and upsetting on hydraulic presses, or ring rolling for seamless rolled rings. Work stays inside the 1177 to 1232 °C window and stops before the material falls below about 1010 °C.
- Solution annealing1177 to 1232 °C followed by a rapid quench, to return carbides to solution and restore ductility.
- Rough machiningProof machining to the agreed test and inspection condition, with allowance left for your finish operations.
- Non-destructive testingUltrasonic examination to ASTM A388, EN 10228-3 or SEP 1921 as specified, plus dye penetrant where required.
- Certification and releaseChemistry, mechanical results and NDT reported on an EN 10204 3.1 certificate, or 3.2 witnessed by a third party such as TUV, SGS, BV or Lloyd's.
Where UNS R30605 forgings are used
Aero and industrial gas turbines
Transition ducts, combustor cans, combustion liners, spray bars, flame holders and afterburner liners. The alloy was qualified on first generation military jet engines and is still a standard maintenance and overhaul material for legacy engine hardware. Demand for forged rings and bars in this grade remains steady.
Oil, gas and subsea
Forged bushings, sleeves, discs and blocks for subsea and deepwater production systems, wellhead and Christmas tree assemblies, industrial air compressors, power generators and nitrogen generators.
Valves and pressure equipment
Forged valve stems, bodies, bonnets, seat rings and blocks for ball, check, globe, gate and plug valves. Forged flanges, tube sheets, hollow forgings and shell components for pressure vessels, air receivers and shell and tube heat exchangers.
Chemical, process and power
Shafts and rolled rings for chemical and plunger pumps. Spindles, bars and gears for power transmission, gas compressors and gearboxes. Forged rolls, wheels and manifolds for shipbuilding, heavy machinery, pulp and paper, and pharmaceutical and biochemical plant.
Medical
Bar stock to ASTM F90 and ISO 5832-5 for surgical fixation components.
Testing, certification and inspection
| Item | Standard | Scope |
|---|---|---|
| Ultrasonic testing | ASTM A388, EN 10228-3, SEP 1921 | Standard on forged product. Acceptance class to order |
| Material certificate | EN 10204 3.1 | Standard |
| Third-party certificate | EN 10204 3.2 | On request. TUV, SGS, BV, Lloyd's and others |
| Chemical analysis | Per AMS 5759 | Ladle and product analysis |
| Mechanical testing | Tensile, hardness | Room temperature standard. Elevated temperature on request |
| Liquid penetrant | ASTM E165 or equivalent | On request |
| Grain size and microstructure | ASTM E112 | On request |
| Sour service | NACE MR0175 / ISO 15156-3 | Where the application requires it |
Send a drawing or a size list. We quote the forging, the machining allowance and the test package together.
Frequently asked questions
What is UNS R30605?
UNS R30605 is a wrought cobalt-chromium-tungsten-nickel superalloy, nominally balance cobalt with 20 % chromium, 15 % tungsten and 10 % nickel. Strengthening is by solid solution rather than precipitation. It holds strength and resists oxidation and gaseous sulfidation to roughly 980 °C (1800 °F).
What is UNS R30605 equivalent to?
It is the same alloy as L605, Haynes 25, Alloy 25 and HS-25, W.Nr. 2.4964 (CoCr20W15Ni) in Germany, KC20WN in France, and GH5605 or GH605 in China. It is covered by AMS 5759 for bars, forgings and rings, AMS 5537 for sheet and plate, ASTM F90 and ISO 5832-5 for implants, and BS HR 40 in the UK.
Which standard applies to UNS R30605 forgings?
AMS 5759 is the governing specification for bars, forgings and rings in the solution heat treated condition. Sheet, strip and plate fall under AMS 5537. Welding consumables fall under AMS 5796 and AMS 5797.
Can UNS R30605 be hardened by heat treatment?
No. It is a solid solution alloy and is not precipitation hardenable. The normal heat treatment is solution annealing at 1177 to 1232 °C with a rapid quench. That restores ductility; it does not raise strength. Higher strength comes from cold work, at the cost of formability.
Why does UNS R30605 lose ductility after service?
Long exposure between roughly 760 and 925 °C precipitates Co2W Laves phase and secondary carbides at grain boundaries, which lowers room temperature ductility. The alloy cannot be aged back to strength, so components exposed in that window should be assessed before reuse and re-solution-annealed where the design allows.
Who supplies open-die forged UNS R30605 from China?
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No. 1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. We produce UNS R30605 forged rings, seamless rolled rings, discs, bars, flanges, shafts, sleeves, bushings, tube sheets and valve parts to AMS 5759, with EN 10204 3.1 or third-party 3.2 certification. Send a drawing or size list to sales@steelforgepieces.com or call +86 189 2135 9659 for a quotation.
What certificates come with the forgings?
An EN 10204 3.1 certificate covering chemical analysis, mechanical test results and ultrasonic testing is standard. A 3.2 certificate witnessed by an independent inspection body such as TUV, SGS, BV or Lloyd's is available on request, as are penetrant testing, grain size reporting and elevated temperature tensile data.
How is UNS R30605 machined?
It work hardens rapidly. Use rigid setups and positive feed, and do not let the tool dwell in the cut. High speed steel tooling usually works better than carbide for drilling and tapping. We can supply forgings rough machined, which takes off the scale bearing layer before your finish operations.
Request a quotation
Send a drawing, a sketch or the finished dimensions and quantity. We reply with price, forging weight, delivery time and the test package.
- Company
- Jiangyin Jiangnan Metal Co., Ltd.
Open-die forging factory - Address
- No. 1 Chengxiqiao Road, Zhouzhuang Town,
Jiangyin City, Jiangsu Province, China
- Telephone, WhatsApp and WeChat
- +86 189 2135 9659
- sales@steelforgepieces.com
- Website
- www.steelforgepieces.com
Related grades
Other cobalt and nickel superalloys we forge.