Austenitic stainless steel with excellent red scale resistance

摘要

PPROBLEM TO BE SOLVED: To provide an austenitic stainless steel superior in red scale resistance in an atmosphere containing a high temperature steam while ensuring workability and weldability, without increasing Cr content so much. PSOLUTION: This austenitic stainless steel has a composition comprising, by mass%, 0.08% or less C, 2.0% or less Mn, 7.0-18.0% Ni, 15.0-26.0% Cr, 1.0-4.0% in total of Si and/or Al, 0.002-0.3% N, and the balance substantially Fe, and has the surface mechanically polish-finished into 0.01-400 m in terms of a surface roughness Ra prescribed in JISB0601. The steel can have a composition, if necessary, including, by mass%, 0.005-0.1% one or more of REM and Ca, 0.01-1.0% at least one or more of Nb, Ti, and V, 0.2-4.0% Cu, and 0.2-3.0% Mo. Moreover, if the contents of Si and/or Al are increased to more than 4.0% but 6.0% or less in total, and one or more elements of REM and Ca are made to be contained together, a step of polishing the surface can be omitted. PCOPYRIGHT: (C)2004,JPO