Patent ID: 7429302
Filing Date: 2008-09-30
Classification: C22C,Y10T

Abstract:
1. A substantially ferritic stainless steel welded sheet comprising: less than about 0.008 mass percent of C; about 1.0 mass percent or less of Si; about 1.5 mass percent or less of Mn; about 11 to about 15 mass percent of Cr; more than 2.0 mass percent and about 2.5 mass percent or less of Ni; less than about 0.10 mass percent of Al; about 0.009 mass percent or less of N; about 0.04 mass percent or less of P; about 0.01 mass percent or less of S; Ti and Nb in an amount no more than incidental impurities; and the balance being Fe and incidental impurities, wherein expressions (1) to (4) are satisfied: where (Cr), (Ni), (Mn), (C), and (N) represent Cr, Ni, Mn, C, and N contents on a mass percent basis, respectively, and wherein the sheet has a welding heat affected zone and the volume percentage of the martensitic structure produced in the welding heat affected zone is less than about 5 percent, the Charpy impact value of the welding heat affected zone is about 30 J/cm 2 or more at −50° C., and the stainless steel sheet has a tensile strength of about 600 MPa or less.