Heat resistant cast steel, method for producing heat resistant cast steel, cast component of steam turbine, and manufacturing method of casting part of steam turbine

摘要

PROBLEM TO BE SOLVED: To provide a heat resistant cast steel capable of achieving all of the improvement of a long creep rupture life, the improvement of creep rupture ductility and toughness, and the suppression of aging deterioration after a high temperature long-term usage, the manufacturing method thereof, cast parts of a steam turbine configured using the heat resistant cast steel, and the manufacturing method of the same.;SOLUTION: The heat resistant cast steel contains, by mass%, C: 0.05-0.15, Si: 0.03-0.2, Mn: 0.1-1.5, Ni: 0.1-1, Cr: 8-10.5, Mo: 0.2-1.5, V: 0.1-0.3, Co: 0.1-5, W: 0.1-5, N: 0.005-0.03, Nb: 0.01-0.2, B: 0.002-0.015, Ti: 0.01-0.1, and a remainder comprising Fe and unavoidable impurities.;COPYRIGHT: (C)2012,JPO&INPIT