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1.4021

X20Cr13

1.4021 (X20Cr13) is a martensitic [[element:Cr|chromium]] steel: hardenable, magnetic, and with medium [[glossary:korrosion|corrosion]] resistance — more of a knife and turbine material than "stainless steel for outdoors." Its high [[element:C|carbon]] makes it [[glossary:risse|crack]]-prone when welding. Typical analysis: 0.2 % C, 13 % Cr, 0.5 % Mn, 0.5 % Si.

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