AISI 431, UNS S43100, DIN 1.4057, X17CrNi16-2 stainless steel
431 stainless steel is a martensitic stainless steel that is AOD melted.
This alloy has excellent corrosion resistance for a 400 series stainless and can be heat treated to high strength levels.
This grade is often used in the aerospace industry as fittings and boltings requiring high yield strength.
The excellent corrosion resistance also lends itself well to the marine industry.
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