Cobalt Alloy 188
Cobalt Alloy 188
What is Cobalt Alloy 188?
Alloy 188 (UNS R30188) is a cobalt-base alloy with excellent high-temperature strength and good oxidation resistance to 2000°F (1093°C).
The high chromium level coupled with small additions of lanthanum produce an extremely tenacious and protective scale. The alloy also has good sulfidation resistance and excellent metallurgical stability as displayed by its good ductility after prolonged exposure to elevated temperatures. Good fabricability and weldability combine to make the alloy useful in gas turbine applications such as combustors, flame holders, liners and transition ducts.
Cobalt Alloy 188 Standards
AMS 5772
-Rod, Bar
AMS 5608
-Plate, Sheet, Strip & Foil
Cobalt Alloy 188 Chemical Composition
| % | Cr | Ni | Co | W | La | B | C | Fe | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 20 | 20 | – | 13 | 0.02 | – | 0.05 | – | – | 0.2 | – | – |
| Max | 24 | 24 | Balance | 16 | 0.12 | 0.015 | 0.015 | 3 | 1.25 | 0.5 | 0.02 | 0.015 |
Cobalt Alloy 188 Data Sheet
Cobalt Alloy 188 Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS | GOST | AFNOR | JIS | BS | EN | OR |
| Alloy 188 | 2.4683 | R30188 | – | – | – | – | – | – |
Cobalt Alloy 188 Mechanical Properties
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.97 g/cm3 | 1410 °C | 963Mpa | 446Mpa | 55% |
Cobalt Alloy 188 Applications
Cobalt Alloy 188 Related Resources
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