HIGH-STRENGTH AND HIGH THERMAL EXPANSION AUSTENITIC STAINLESS STEEL EXCELLENT IN HIGH-TEMPERATURE SETTLING RESISTANCE AND CORROSION RESISTANCE AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a high-strength and high thermal expansion austenitic stainless steel excellent in high-temperature settling resistance and corrosion resistance, and to provide its manufacturing method.;SOLUTION: This high-strength and high thermal expansion austenitic stainless steel has a composition consisting of 0.10-0.30 wt.% C, ≤ 3.0 wt.% Si, ≤ 3.0wt.% Mn, 5.0-12.0 wt.% Ni, 18.0-30.0 wt.% Cr, and 0.05-0.30 wt.% N, and the balance Fe with inevitable impurities. The area ratio of carbide and carbo-nitride precipitated in a metal structure of the stainless steel is below 3%, and the Ni equivalent expressed by expression 1, ( Ni equivalent = 24.2C + 13.7N + 0.35Si + 0.5Mn + Ni + 0.65Cr) is 24.0-30.0 wt.%.;COPYRIGHT: (C)2004,JPO