| 摘要 |
PURPOSE:To provide superior creep rupture strength at high temp. to a stabilized austenitic stainless steel contg. Nb or Ti by solubilizing C in the steel at a high temp. to the utmost and carrying out relatively rapid cooling. CONSTITUTION:An austenitic stainless steel contg. 0.04-0.1% C and 2XC%-1% in total of Nb and/or Ti is manufactured. At this time, a stage in which the maximum temp. is attained among all of stages after casting is carried out at least once in a high temp. heating or working stage between casting and cold working stages, and the heated steel is immediately cooled to 500 deg.C at >=0.3 deg.C/ sec cooling rate, Cold working, final soln. heat treatment and quenching are then carried out.
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