Stainless Steel 420 Bars 1.4021, X20Cr13, S42000 Round AISI 420 stainless steel is an alloy of iron, further classified as a martensitic stainless steel. 420 is the AISI designation for this material. 1.4021 is the EN numeric designation. X20Cr13 is the EN chemical designation. S42000 is the UNS number. Additionally, the British Standard (BS) designation is 420S29.
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