What is UNS S31254? This grade of steel is a super austenitic stainless steel. They are high end stainless steel designed for impact toughness resistance to chloride crevice corrosion, stress corrosion cracking, and pitting. These are austenite with high content of nickel and chromium. What is ASTM A240 / A240M? It is an American material standard for standard specification for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications. Why S31254 called Alloy 254 Stainless Steel? When a material grade is specified as stainless steel, it means it has chromium content in it
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