18Ni-9Co-2.8Mo-0.8Ti is a precipitation-hardening maraging steel engineered for ultra-high strength with exceptional toughness and ductility. The nickel-cobalt-molybdenum-titanium system produces a martensitic matrix strengthened by intermetallic precipitates formed during low-temperature aging, eliminating the brittleness typically associated with ultra-high-strength steels. This alloy is employed in aerospace structures, pressure vessels, tooling, and sporting equipment where the combination of extreme strength, damage tolerance, and fatigue resistance justifies the material cost; it is preferred over conventional high-strength steels and some titanium alloys when weight savings and fracture toughness must both be optimized.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Elongation at Break(εf) | 19.00 | - | — | ||
Ultimate Tensile Strength(σUTS) | 216.8 | ksi | — | ||
Yield Strength (0.2% offset)(σy) | 189.9 | ksi | — |