Haynes® 188
Haynes 188 is a cobalt-nickel-chromium-tungsten alloy that combines excellent high-temperature strength with outstanding resistance to oxidizing environments up to 2000°F (1095°C) for prolonged periods. The controlled addition of lanthanum gives it superior oxidation resistance compared to Haynes 25.
- Common Forms: Sheet, Strip, Plate, Bar.
- Key Feature: Outstanding oxidation resistance + Thermal stability.
- Addition: Lanthanum modified for tenacious oxide scale.
- Fabricability: Excellent ductility and weldability.
Haynes 188 is the material of choice for critical components in gas turbine engines, such as combustors and flame holders. While sharing the strength of Haynes 25, the addition of Lanthanum allows 188 to form a protective oxide scale that adheres tightly even during severe thermal cycling, preventing the material from degrading over time.
Superior Oxidation Resistance
Resists oxidation at temperatures up to 2100°F (1150°C). The minute Lanthanum addition creates an incredibly stable and adherent oxide layer.
Thermal Stability
Maintains ductility after long-term aging at elevated temperatures better than Haynes 25, reducing the risk of embrittlement.
Hot Corrosion Resistance
Excellent resistance to sulfate deposit hot corrosion, making it ideal for jet engines operating in marine environments.
| Element | Content (%) |
|---|---|
| Cobalt (Co) | 39.0 min (Balance) |
| Nickel (Ni) | 20.0 - 24.0 |
| Chromium (Cr) | 21.0 - 23.0 |
| Tungsten (W) | 13.0 - 15.0 |
| Iron (Fe) | 3.0 max |
| Lanthanum (La) | 0.03 - 0.15 |
| Carbon (C) | 0.05 - 0.15 |
*Note: The Lanthanum addition is the key differentiator for oxidation performance.
| Product Form | Standards (AMS) |
|---|---|
| Sheet, Strip, Plate | AMS 5608 |
| Bar, Forgings, Rings | AMS 5772 |
| Pipe & Tube | AMS 5586 |
| Property | Typical Values (Room Temp) |
|---|---|
| Tensile Strength | 135 - 150 ksi (930 - 1035 MPa) |
| Yield Strength (0.2% Offset) | 60 - 75 ksi (415 - 515 MPa) |
| Elongation | 45 - 55 % |
| Hardness (Rockwell B) | 90 - 98 HRB |
Combustor Liners
The primary application: inner walls of jet engine combustors exposed to extreme heat and gas velocity.
Flame Holders
Components in afterburners and exhaust ducts that stabilize the flame.
Transition Ducts
Ducting that guides hot gases from the combustor to the turbine section.
Spray Bars
Fuel injection systems located within the hot section of the engine.
Need Haynes 188 Sheet or Bar?
We stock aerospace-grade Haynes 188. Full traceability and certification to AMS 5608/5772 included.
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