| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for heat treating a Co base alloy capable of suppressing deterioration in the intergranular corrosion resistance of a Co base alloy even in the case arc welding such as PTA welding and TIG welding is used. SOLUTION: This method includes a process in which a Co base alloy having chemical components of, by weight, 0.9 to 1.4% C, <=1.0% Mn, 0.4 to 2.0% Si, 26.0 to 32.0% Cr, 3.0 to 6.0% W, <=1.0% Mo, <=3.0% Ni, <=3.0% Fe, and the balance Co with <=0.5% other impurities is welded to a carbon steel and is heated to >=700 deg.C at the point of time in which the content of Fe reaches >=5.0%.
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