| 摘要 |
PURPOSE:To manufacture an Fe-base alloy combining high yield strength with high strength and excellent in stress corrosion cracking resistance, by subjecting an alloy having a specific composition consisting of C, Si, Mn, Ni, Cr, Mo, P, S, and Fe to hot working and heat treatment under proper conditions. CONSTITUTION:The Fe-base alloy consisting of, by weight, <=0.04% C, <=1% Si, <=2% Mn, 25-45% Ni, 25-35% Cr, <=6% Mo, <=0.01% P, <=0.01% S, and the balance Fe is subjected to hot working at 850-1,250 deg.C at >=20% draft. Then the above hot-worked alloy is held at 900-1,150 deg.C for 2min-5hr and cooled at a rapid cooling velocity higher than air cooling. In this way, the solid solution-strengthening-type Fe-base alloy having a 0.2% yield strength under room temp. of >=21kg/mm<2> and a strength of >=52kg/mm<2> tensile strength and excellent in stress corrosion cracking resistance in high-temp. and high- pressure water can be obtained. |
