Development of Heat Resisting High Chromium Cast Steel for Ultra Super Critical Turbine Plant

Abstract

Use of the ultra-high temperature and ultra-high pressure steam to improve the efficiency of the fossil power plants, have been actively studied and the verification tests have also been carried out. As a material for the above steam conditions, 12%Cr heat resisting cast steel, has been newly developed, which is able to raise the steam temperature of the fossil power plants to 593°C.
This material has better creep strength and creep rupture strength than the conventional Cr-Mo steel, in addition, it has high ductility and toughness, and the weldability is also considered. This newly developed material has been in the process of the manufacture to be used for the ultra-super critical fossil plant.