NI-BASED ALLOY FOR A FORGED PART OF A STEAM TURBINE WITH EXCELLENT HIGH TEMPERATURE STRENGTH, FORGEABILITY AND WELDABILITY, ROTOR BLADE OF A STEAM TURBINE, STATOR BLADE OF A STEAM TURBINE, SCREW MEMBER FOR A STEAM TURBINE, AND PIPE FOR A STEAM TURBINE

摘要

A Ni-based alloy for a forged part of a steam turbine having excellent high temperature strength, forgeability and weldability includes, in percentage by mass, 0.01 to 0.15 of C, 18 to 28 of Cr, 10 to 15 of Co, 8 to 12 of Mo, 1.5 to 2 of Al, 0.1 to 3 of Ti, 0.001 to 0.006 of B, 0.1 to 0.7 of Ta, and the balance of Ni plus unavoidable impurities.