13Cr Martensitic Stainless (var. 21)
metal13Cr 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.
aerospace fastenersoil & gas valve bodiesturbine blade rootsbearing races and bushingsdownhole drilling toolshigh-strength springs
Compliance & Regulations
?Conflict Free?RoHS?REACH?TSCA?Prop 65
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Elongation at Break(εf) | — | - | — | — | |
Ultimate Tensile Strength(σUTS) | — | ksi | — | — | |
Yield Strength (0.2% offset)(σy) | — | ksi | — | — |
Verified Unverified Low confidence (<80%) Link to source
Regulatory Screening
Environmental
Quality & Standards
Industry-Specific
RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.