| 摘要 |
PURPOSE:To improve high-temp. characteristics, more particularly tensile strength and fatigue strength by heat-treating an alloy contained with prescribed ratios of Fe, C, Si, Mn, Ni, Cr, etc. under prescribed conditions. CONSTITUTION:A titled metallic material wherein the alloy contg. 0.01-0.2% C, <=2% Si, <=2% Mn, 25-50% Ni, 13-23% Cr, 1.5-3.5% Ti, 0.1-1.5% Al, >=2 Ti/Al, and the balance Fe or further contg. >=1 kind selected among <=3% Mo, <=3%, W, <=5% (Nb+Ta), <=1% V, <=3% Hf, <=0.5% Zr, <=0.05% B in addition to the above is preliminarily heat-treated at 700-975 deg.C, and is subjected the same to hot working at <=975 deg.C and further to solutionizing and aging treatments at <=975 deg.C. Such metallic material has excellent high temp. characteristics, more particularly tensile strength and fatigue strength. |
