LOW CARBON MARTENSITIC STAINLESS STEEL SHEET EXCELLENT IN FORMABILITY, CORROSION RESISTANCE AND TOUGHNESS, ITS PRODUCTION AND WELDED STEEL PIPE

摘要

PROBLEM TO BE SOLVED: To provide a low carbon martensitic stainless steel sheet excellent in formability and corrosion resistance by being used to the stock for a welded pipe, to provide a method for producing it and to provide a welded steel pipe. ;SOLUTION: This low carbon martensitic stainless steel sheet is composed of by weight, ≤0.02% C, 0 to 1.0% Si, 0 to 3.0% Mn, ≤0.040% P, ≤0.010% S, 9.0 to 13.0% Cr, 1.0 to 4.0% Ni, 0 to 1.2% Mo, 0 to 0.10% Al, 0 to 0.10% Ti, 0 to 1.2% Cu, 0 to 0.10% Nb, ≤0.10% V, ≤0.020% N, and the balance substantially Fe, in which the total content of Cr, Ni and Mo satisfies the following inequality I or II in the case the thickness of the steel sheet is defined as (t): the inequality I: in the case of t≤10, Cr+Ni+Mo≤16 and the inequality II: in the case of t10, Cr+Ni+Mo≤16-0.1(t-10).;COPYRIGHT: (C)2000,JPO