Martensitic stainless steel sheet of high strength and toughness, to prevent cracking process the edge of the sheet of cold rolled steel and a method for manufacturing the steel sheet.

摘要

A martensitic stainless steel sheet of high strength and toughness with a chemical composition comprising, in mass percent, more than 0, 03-0, 15% of C, 0, 2-2, 0% Si, not more than 1, 0% of Mn, not more than 0, 06% P, not more than 0, 006% of S, 2, 0-5, 0% Ni, 14, 0-17, 0% Cr more than 0, 03-0, 10% of N, 0, 0010-0, 0070% B and balance Fe and unavoidable impurities and including not less than 85% vol% of martensite phase, comprising further said sheet optionally one stainless steel or both of Mo and Cu elements with a total not exceeding 2 0 mass and a value defined by Equation (1) not less than ¿1, 8: value a = 30 (C + N) -1, 5Si + 0, 5Mn + Ni-1 + 3Cr 11, 8 (1).