13Cr-8Ni Austenitic Stainless (var. 20)

This is a precipitation-hardened austenitic stainless steel combining 13% chromium and 8% nickel with significant aluminum and molybdenum additions to achieve high strength while retaining austenitic corrosion resistance. The composition—particularly the aluminum content and carbon level—indicates a martensitic-aging or PH stainless variant designed for applications demanding both corrosion resistance and elevated strength without sacrificing ductility. Industrial applications include aerospace fasteners, aircraft landing gear components, and high-strength corrosion-resistant valve bodies where conventional austenitic grades (300-series) would be insufficient; engineers select this variant when stainless passivity is essential but standard austenitic alloys lack the necessary yield strength for load-bearing structural roles.