HIGH-STRENGTH 13Cr-BASED STAINLESS THICK STEEL PLATE EXCELLENT IN TOUGHNESS AND WORKABILITY AND PRODUCTION METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a 13Cr-based stainless thick steel plate which has stable corrosion resistance in ordinary environments, like the atmospheric environment and a submerged environment, is excellent with reduced addition amounts of alloy elements and combines high strength and good toughness and workability and its production method.;SOLUTION: A 13Cr-based stainless thick steel plate comprises 0.015-0.050 mass% of C, 0.15-0.50 mass% of Si, 0.20-0.50 mass% of Mn, 0.030 mass% or less of P, 0.012 mass% or less of S, 11.50-13.50 mass% of Cr, less than 0.20 mass% of Ni, less than 0.20 mass% of Mo, less than 0.0080 mass of O, 0.010-0.045 mass% of N and remaining Fe and unavoidable impurities and has a two-phase structure consisting of 30-70 vol.% of a ferrite phase and remaining martensite phase, and the maximum grain size of the ferrite crystal grains is 100 μm or smaller.;COPYRIGHT: (C)2016,JPO&INPIT