GH5188 Cobalt Alloy
GH5188 is a cobalt nickel chromium, solid solution strengthened wrought high temperature alloy. Cobalt forms the balance, with 20% to 24% nickel, 20% to 24% chromium, 13% to 16% tungsten, and small additions of lanthanum and boron. Tungsten supplies solid solution strengthening, while chromium and lanthanum support oxidation and hot corrosion resistance. The source lists long term service at ≤1100℃, good room temperature ductility, and cold or hot workability into plate, bar, and forgings for load bearing, oxidation resistant high temperature parts.
Product details
Chemical composition
| GH5188 | C | Si | Mn | P | S | Ni | Cr | Fe | Co | Cu | W | B | La |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | 0.05 | 0.2 | – | – | – | 20.0 | 20.0 | – | – | – | 13.0 | 1.75 | 0.03 |
| max | 0.15 | 0.5 | 1.25 | 0.02 | 0.015 | 24.0 | 24.0 | 3.0 | Bal | 0.07 | 16 | 2.1 | 0.12 |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| Haynes 188 Udimet 188 Alloy 188 | R30188 | 2.4683 | – | GH5188 GH188 | HS188 CoCr22NiW KCN22W |
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Physical properties
| Density g/cm³ | 9.09 |
|---|---|
| Melting range ℃ | 1300~1360 |
| Electrical resistivity μΩ•m | 1.033 |
| Linear expansion coefficient a/10-6℃-1 | 14.3(20~100℃) |
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Mechanical properties
| Tensile strength Rm N/mm | ≥690 |
|---|---|
| Yield strength RP0.2 N/mm | ≥303 |
| Elongation % | ≥30 |
| Hardness HB | ≥293 |
| *After solution heat treatment | |
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Applications
- Flame tubes, guide vanes, and afterburner components in aircraft engines
- Combustion-chamber structures, high-temperature turbine blades, and exhaust-nozzle assemblies
- Nuclear-reactor heat exchangers and corrosion-resistant internals for high-temperature gas-cooled reactors
- High-temperature, high-pressure reactors, sulfur-bearing service piping, and corrosion-resistant valves
- Superheaters in coal-fired power plants, supercritical boiler piping, and collectors for concentrated solar power
- High-temperature components in marine gas turbines and corrosion-resistant structures for marine environments
- Waste-incinerator combustion chambers and corrosion-resistant linings in industrial waste-gas treatment equipment
Available product forms
- Round Bar
- Wire
- Forgings
- Plate
- Strip
- Seamless Pipe
- Welded Pipe
- Capillary Tube
- Flanges
- Pipe Fittings
- Non-standard Custom Parts
Values follow the Milike materials catalogue and are provided for preliminary review. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
- Heat and batch traceability
- PMI testing available
- Cut-to-size processing
- Material certificates on request
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