| 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 t>10, Cr+Ni+Mo<=16-0.1(t-10).
|
