13Cr Martensitic Stainless Steel (variant 21) is a high-strength, precipitation-hardened stainless steel alloyed with cobalt and molybdenum for enhanced hardness and wear resistance. It is primarily used in aerospace, oil & gas, and high-performance industrial applications where corrosion resistance must be combined with exceptional strength and dimensional stability. Engineers select this grade when standard martensitic stainless steels cannot meet demanding strength-to-weight or wear-resistance requirements, particularly in components exposed to aggressive corrosive environments at elevated service temperatures.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Elongation at Break(εf) | 12.00 | - | — | ||
Ultimate Tensile Strength(σUTS) | 239.4 | ksi | — | ||
Yield Strength (0.2% offset)(σy) | 182.5 | ksi | — |