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12Cr13 20Cr13 30Cr13 40Cr13 Hot Rolled Stainless Steel Round Bars Martensitic grades 12Cr13 ( 1Cr13 ), 20Cr13 ( 2Cr13 ), 30Cr13 ( 3Cr13 ) and 40Cr13 ( 4Cr13 ) hardenable stainless steels used for its ...