Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
CoCr20W15Ni is a solid-solution-strengthened cobalt–chromium–tungsten–nickel alloy — the strongest of the fabricable cobalt-base alloys — combining excellent high-temperature strength with good oxidation resistance to about 980 °C (1800 °F) and outstanding resistance to sulfidation, wear and galling. This datasheet presents the material within the European (DIN / EN / Werkstoff-Nummer / BS) standard system.
The cobalt base with 20% chromium provides oxidation and hot-corrosion resistance, while 15% tungsten gives solid-solution strengthening and 10% nickel improves fabricability and stability of the face-centred-cubic structure. The alloy is non-magnetic, retains useful strength to about 1000 °C, and resists metal galling and wear. It work-hardens very rapidly, so frequent intermediate annealing is recommended for complex forming. It is normally melted by vacuum induction melting followed by electroslag remelting (ESR).
Because of its long and widespread use it is an exceptionally well-characterised material. Typical applications include gas-turbine combustor and hot-section components, aerospace and industrial turbine hardware, and — at surgical-implant quality — orthopaedic and cardiovascular implants. It is supplied solution-heat-treated (2150–2250 °F, rapid quench); high strength can also be developed by cold work, in which condition it remains non-magnetic.
Values per manufacturer ( / Ulbrich) data, solution-annealed condition.
| Property | Value | Unit |
|---|---|---|
| Density | 9.13 | g/cm³ |
| Melting range | 1330–1410 | °C |
| Young's modulus (20 °C) | 225 | GPa |
| Specific heat capacity (20 °C) | 385 | J/kg·K |
| Thermal conductivity (20 °C) | 9.4 | W/m·K |
| Electrical resistivity (20 °C) | 0.89 | µΩ·m |
| Coefficient of thermal expansion (25–100 °C) | 12.3 | µm/m·°C |
| Magnetic response | Non-magnetic (incl. cold-worked) | — |
| Maximum oxidation-resistance temperature | ~980–1095 | °C |
Composition per DIN 17744 (W.Nr. 2.4964, CoCr20W15Ni).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Cobalt | Co | Balance | — | Base; high-temperature strength |
| Chromium | Cr | 19.0 | 21.0 | Oxidation resistance |
| Tungsten | W | 14.0 | 16.0 | Solid-solution strengthening |
| Nickel | Ni | 9.0 | 11.0 | Austenite (FCC) stabiliser |
| Iron | Fe | — | 3.0 | Residual |
| Manganese | Mn | 1.0 | 2.0 | Deoxidiser |
| Carbon | C | 0.05 | 0.15 | Carbide strengthening |
| Silicon | Si | — | 0.4 | Deoxidiser |
| Phosphorus | P | — | 0.04 | Residual impurity |
| Sulphur | S | — | 0.03 | Residual impurity |
Nominal: Co-20Cr-15W-10Ni (L-605 / 25). The strongest fabricable cobalt alloy; tungsten gives solid-solution strengthening, chromium oxidation resistance, for continuous service to ~980 °C with excellent sulphidation resistance.
Solution-annealed condition, per DIN 17744 for W.Nr. 2.4964.
| Property | Value | Unit |
|---|---|---|
| Tensile strength (Rm) | ≥900 | MPa |
| 0.2% proof strength (Rp0.2) | ≥400 | MPa |
| Elongation at fracture (A) | ≥40 | % |
| Brinell hardness | ~240–280 | HB |
Values per EN/DIN; confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| High-temperature oxidation | Good | To ~980–1095 °C; Cr₂O₃ scale |
| Sulfidation | Outstanding | Key advantage of cobalt base |
| Wear / galling | Outstanding | Cobalt base resists metal galling |
| High-temperature strength | Excellent | Strongest fabricable cobalt alloy; useful to ~1000 °C |
| Hot corrosion | Very Good | Marine / combustion environments |
| Body-fluid corrosion (implant) | Excellent | Surgical-implant quality grade |
| Metallurgical stability | Caution | Loses room-temp ductility after long mid-temperature exposure (like other superalloys) |
A solid-solution cobalt-base alloy; strengthened by solid solution and carbides (and by cold work). Heat treatment is solution annealing.
Solution Anneal Temperature: 1177–1232 °C (2150–2250 °F), followed by rapid air or water quench Purpose: dissolves carbides, restores ductility and develops optimum properties.
Forming note: the alloy work-hardens very rapidly, so frequent intermediate solution anneals are recommended for complex or multi-stage forming. Hot working is carried out from ~1205 °C (2200 °F).
Readily welded by most conventional methods — gas-tungsten-arc (GTAW), gas-metal-arc (GMAW), shielded-metal-arc (SMAW), electron-beam and resistance welding. Welding behaviour is similar to 188. Submerged-arc welding is not recommended (high heat input and slow cooling promote cracking).
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG · GMAW / MIG | Excellent | Matching Co-Cr-W filler (EN ISO) |
| SMAW / stick | Good | Matching cobalt electrode |
| EB / resistance | Good | — |
Use matching-composition filler. Keep joints clean; avoid submerged-arc welding.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Work hardening | Very rapid; rigid setup, sharp tooling, positive rake, low speeds |
| Intermediate anneal | Frequent solution anneals for complex forming |
| Coolant | Ample flood coolant |
Forming Processes
| Process | Notes |
|---|---|
| Hot working | From ~1205 °C (2200 °F) |
| Cold forming | Possible but work-hardens rapidly; intermediate anneals needed |
| Solution anneal | 1177–1232 °C, rapid quench, to restore ductility |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Gas turbines | Combustor liners, hot-section sheet components, rings | High-temp strength + oxidation/sulfidation resistance |
| Aerospace | Military and commercial turbine-engine hardware | Strength to ~1000 °C |
| Medical | Orthopaedic and cardiovascular implants | Biocompatibility; surgical-implant quality |
| Industrial | Wear/galling-resistant high-temperature parts | Wear + galling resistance |
| Power / process | High-temperature structural components | Sulfidation + thermal stability |
| Product Form | Standard | Other |
|---|---|---|
| Sheet, strip, bar, wire | W.Nr. 2.4964 · CoCr20W15Ni | BS HR40 · AFNOR KC20WN |
| Forgings | W.Nr. 2.4964 | — |
| Welding consumables | Matching Co-Cr-W filler (EN ISO) | — |
| Composition / designation | W.Nr. 2.4964 · CoCr20W15Ni | China GH5605 / GH25 |
Cobalt-base high-temperature alloy. W.Nr. 2.4964; BS HR40; AFNOR KC20WN; listed in ISO 15156-3 / ISO 15156-3.
| EN Symbol | Co/Ni | Cr % | Other | Best Used For |
|---|---|---|---|---|
| CoCr20W15Ni | Co bal | 19–21 | W 14–16, Ni 9–11 | Strongest fabricable Co alloy; turbine + implant |
| CoNi22Cr22W14La | Co bal | 20–24 | W 13–15, Ni 22 | Better oxidation to 1095°C; turbine |
| NiCr22W14Mo | Ni bal | 20–24 | W 14, Mo 2 | Ni-base; high-temp strength + stability |
| CoCr28W4 | Co bal | 27–32 | W 4–6 | Hardfacing; extreme wear (cast/weld) |
| NiCr22Mo9Nb | Ni bal | 20–23 | Mo 9, Nb | Ni-base; aqueous corrosion + strength |
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