Haynes 188 Alloy
Haynes 188 (UNS R30188) is a cobalt-nickel-chromium-tungsten alloy. It delivers outstanding high-temperature strength and superior resistance to oxidation during long-term service at temperatures up to 1095 °C (2000 °F), along with excellent protection against hot corrosion induced by sulfate deposits.
Haynes 188 Alloy Basic Introduction
Haynes 188 (UNS R30188) is a cobalt-nickel-chromium-tungsten alloy. It delivers outstanding high-temperature strength and superior resistance to oxidation during long-term service at temperatures up to 1095 °C (2000 °F), along with excellent protection against hot corrosion induced by sulfate deposits.
This alloy can be easily fabricated and formed using standard processing methods, and is also suitable for cast parts. It additionally offers strong resistance to molten chloride salts and good tolerance to gaseous sulfidation.
Haynes 188 Alloy Chemical Composition
| Element | Min | Max |
|---|---|---|
| Carbon | 0.05 | 0.15 |
| Manganese | -- | 1.25 |
| Silicon | 0.20 | 0.50 |
| Phosphorus | -- | 0.02 |
| Sulfur | -- | 0.015 |
| Chromium | 21.0 | 23.0 |
| Nickel | 20.0 | 24.0 |
| Tungsten | 13.0 | 15.0 |
| Lanthanum | 0.03 | 0.12 |
| Boron | -- | 0.015 |
| Iron | -- | 3.0 |
| Cobalt | Bal. | Bal. |
Applications of Haynes 188 Alloy
The unique combination of mechanical and corrosion properties makes HAYNES 188 alloy well-suited for a wide range of fabricated components in the aerospace industry.
It is extensively deployed in mature military and commercial gas turbine engines for manufacturing combustion cans, transition ducts, and afterburner parts.
In newer engine development programs, HAYNES 188 is partially substituted by the advanced HAYNES 230 alloy, which delivers upgraded comprehensive performance, while still retaining extensive application scenarios.
