| 摘要 |
PURPOSE:To develop a steel stock excellent in strength at high temp. and structure stability and suitable as material for equipment for high-temp. service by adding specific amounts of Cu, Mg, and B, or further, Mo, W, Nb, etc., to an N-containing austenitic stainless steel and by reducing Si and Al content. CONSTITUTION:As the material for equipment such as boiler, chemical plant, etc., used under high-temp. environment, <0.15%, by weight, C, <0.30% Si, <10% Mn, 14-27% Cr, 6-30% Ni, 2-6% Cu, 0.003-0.030% Al, 0.001-0.015% Mg, 0.001-0.010% B, and 0.05-0.35% N are incorporated, or further, 0.30-3.0% Mo and/or 0.5-5.0% W or 0.05-1.5% Nb is incorporated independently or in combination. By improving creep rupture strength by simultaneous addition of Cu, B, and Mg together with N, and by adding Nb, as carbonitride dispersion- improving element, and Mo and W, as solid solution-strengthening elements, each by a small quantity, an austenitic stainless steel excellent in strength at high temp. can be obtained.
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