Haynes 188 (UNS R30188 / W.Nr 2.4683)
Haynes 188 (UNS R30188 / W.Nr. 2.4683) is a cobalt-nickel-chromium-tungsten alloy that com- bines excellent high-temperature strength with very good resistance to oxidizing environ- ments up to 1095℃ for prolonged exposures, and excellent resistance to sulfate deposit hot corrosion. It is readily fabricated and formed by conventional techniques, and has been used for cast component. Other attractive features include excellent resistance to molten chloride salts, and good resistance to gaseous sulfidation.
Equivalent Grades
Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
Haynes 188 | GH5188 | – | Haynes 188 | R30188 | – | 2.4683 | KCN22W | – | – | – |
Chemical Composition, %
Alloy | C | Si | Mn | P | S | Cr | Ni | Co | W | La | Fe |
Haynes 188 | 0.05-0.15 | 0.2-0.5 | ≤1.25 | ≤0.02 | ≤0.015 | 21.0-23.0 | 20.0-24.0 | Bal | 13.0-15.0 | 0.03-0.15 | ≤3.0 |
Typical Physical and Mechanical Properties (RT, Solution annealed)
Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HRB |
9.07 | 1330-1410 | 991 | 483 | 50.6 | / |
Available Products and Specifications
Rod, Bar, Wire and Forgings | AMS 5772 |
Plate, Sheet and Strip | AMS 5608 |
Pipe and Tube | – |
Welding Product | – |
Others | – |
Features
- Meets AMS 5608 specifications
- Meets AMS 5772 specifications
- Enormously beneficial high temperature strength
- Provides oxidation resistance up to 2100° F
- Excellent post-aging ductility
- Galling resistant
- Easily strengthened by cold deformation
Applications
- Gas turbine operations
- Combusters
- Flame holders
- Liners
- Transition ducts
- Exhaust frames