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Harper Johnson——Studied at the University of Edinburgh, Lives in Edinburgh, Scotland.
420 stainless steel is a martensitic higher carbon version of types 410 and 416
stainless that can be hardened by heat treatment. ... It has good ductility in the annealed condition but is capable of being hardened up to 50 RHC. Its best corrosion resistance is achieved when
420 is hardened and surface ground or polished.
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