USA UNS S42225
Corresponding Standard ASTM A959-2019
Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Classification Martensitic Stainless Steel
Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu Mo Ti W V Nb Co Al Sn
Minimum Value 0.2 0.2 0.5 - - 11 0.5 - 0.9 - 0.9 0.2 - - - -
Maximum Value 0.25 0.5 1 0.02 0.01 12.5 1 0.15 1.25 0.025 1.25 0.3 0.05 0.2 0.025 0.02
• Unless otherwise indicated, a grade designation originally assigned by the American Iron and Steel Institute (AISI).

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