Haynes 188 (UNS R30188): Cobalt Superalloy for Combustion Chambers
AMS 5608 / ASTM B435 · Published: 2026-06-02 · Updated: 2026-06-02
Haynes 188: cobalt-base superalloy with exceptional oxidation resistance to 1,095°C and outstanding post-aging ductility — retains 15-20% elongation after 1,000+ hours at 870°C. For military and commercial engine combustor liners, transition...
Haynes 188: cobalt-base superalloy with exceptional oxidation resistance to 1,095°C and outstanding post-aging ductility — retains 15-20% elongation after 1,000+ hours at 870°C. For military and commercial engine combustor liners, transition ducts, afterburner flame holders. Cobalt resists sulfidation from jet fuel sulfur.
Quick Facts
| Category | Nickel Alloy |
| Standard | AMS 5608 / ASTM B435 |
| Density | 9130 kg/m³ |
| Yield Strength | 450 MPa |
| Tensile Strength | 950 MPa |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
Why cobalt not nickel for combustors?
Cobalt retains ductility after long-term exposure (nickel forms embrittling TCP phases). Better sulfidation resistance from jet fuel.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu