| 摘要 |
A forged alloy for a steam turbine of good creep property and fatigue property and a rotor for a steam turbine using the forged alloy, the forged alloy for the steam turbine comprising 15 to 45 wt% of Fe, 14 to 18 wt% of Cr, 1.0 to 1.8 wt% of Ti, 1.0 to 2.0 wt% of Al, 1.25 to 3.0 wt% of Nb, 0.05% or less of C+N and the balance of Ni. The crystal grain size number after heat treatment of the forged alloy is 0 to 2, and the heat treatment includes a plurality of solution heat treatments in different temperature ranges.
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