13Cr-8Ni is a precipitation-hardened martensitic stainless steel that combines chromium for corrosion resistance with nickel, molybdenum, and aluminum to enable age-hardening strengthening. This material is engineered for high-strength applications requiring both corrosion resistance and elevated hardness, positioned between conventional martensitic stainless steels (like 17-4 PH) and austenitic grades; the aluminum content enables precipitation hardening without sacrificing toughness as severely as carbon-heavy martensitic grades. It is widely used in aerospace fasteners, landing gear components, pump shafts, and oil & gas valves where designers need corrosion resistance combined with strength in moderately thick sections, making it a preferred choice when standard martensitic stainless steels lack toughness or when full austenitic stainless steels offer unnecessary softness.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Elongation at Break(εf) | 13.50 | - | — | ||
Ultimate Tensile Strength(σUTS) | 228 | ksi | — | ||
Yield Strength (0.2% offset)(σy) | 220.6 | ksi | — |