18Ni-7Co-2.9Mo is a precipitation-hardened maraging steel engineered for ultra-high strength with retained toughness and ductility. This nickel-cobalt-molybdenum system gains its strength through age-hardening rather than carbon content, making it exceptionally clean and damage-tolerant compared to conventional high-strength steels. It is widely used in aerospace structures, tooling, and precision engineering where the combination of high strength, excellent fatigue resistance, and superior fracture toughness is critical, and where the material's ability to be welded and machined before hardening offers significant manufacturing advantages.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Elongation at Break(εf) | 28.00 | - | — | ||
Ultimate Tensile Strength(σUTS) | 160.9 | ksi | — | ||
Yield Strength (0.2% offset)(σy) | 145.9 | ksi | — |