What is S42000 Steels? This grade of steel is a martensitic stainless steel. S42000 is a material grade and designation defined in UNS ASTM A480 standard. As a chromium carbon steel it can be enumerated in martensitic stainless steel. What is ASTM A480? ASTM A480 is an American material standard for general Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip. Why S42000 called Alloy 420 Stainless Steel? When a material grade is specified as stainless steel, it means it has chromium content in it. S42000 is the UNS designation alloy, also referred as 420 alloy and is
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