11Cr-7Ni-3.3Mo is a martensitic stainless steel alloyed with cobalt and molybdenum, designed to achieve high strength while maintaining corrosion resistance. This material is used in demanding aerospace and defense applications—particularly jet engine components, landing gear, and fasteners—where the combination of strength, fatigue resistance, and corrosion protection in harsh environments justifies its cost and processing complexity. Engineers select this alloy over conventional martensitic stainless steels when applications require superior strength-to-weight ratios and resistance to both mechanical loading and corrosive service conditions, such as saltwater or high-temperature oxidizing environments.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Elongation at Break(εf) | 11.40 | - | — | ||
Ultimate Tensile Strength(σUTS) | 237.9 | ksi | — | ||
Yield Strength (0.2% offset)(σy) | 199.3 | ksi | — |