HEAT RESISTANT CAST STEEL, MANUFACTURING METHOD OF HEAT RESISTANT CAST STEEL, CASTING PARTS OF STEAM TURBINE AND MANUFACTURING METHOD OF CASTING PARTS OF STEAM TURBINE

摘要

A heat resistant cast steel of an embodiment contains in percent 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.