HIGH CORROSION RESISTANT STAINLESS STEEL EXCELLENT IN TORSIONAL STRENGTH CHARACTERISTIC

摘要

PROBLEM TO BE SOLVED: To provide a stainless steel suitable as the material of the equipment and parts, such as stern shaft and pump shaft, requiring high torsional strength as well as corrosion resistance, minimal in the increase of expensive additive elements and excellent in cost performance. ;SOLUTION: This steel is a high corrosion resistant stainless steel having ≥560MPa static torsional strength after heat treatment at ≥1050°C and excellent in torsional strength characteristic, which has a composition consisting of, by weight, ≤0.03% C, 2.5-4.0% Si, 3.0-7.0% Mn, ≤0.04% P, ≤0.01% S, ≤0.4% Cu, 4-8% Ni, 22.5-30.0% Cr, 0.05-0.25% N, and the balance essentially Fe. Further, in order to improve hot workability, corrosion resistance, strength, etc., to a greater extent, 0.0005-0.0100% of one or ≥2 elements among Ca, B, and Mg and 0.01-0.50% of one or ≥2 elements among Nb, V, and Ti can be incorporated.;COPYRIGHT: (C)1997,JPO