HIGH STRENGTH HIGH CHROMIUM CAST STEEL FOR HIGH TEMPERATURE PRESSURE VESSEL

摘要

PURPOSE: To increase high temp. strength of a high strength high chromium cast steel for high temp. pressure vessel having ductility and toughness, equal to those of conventional material, applicable to steam turbine for thermal power generation. ;CONSTITUTION: This cast steel has a composition consisting of, by weight ratio, 0.05-0.13% carbon, ≤0.7% silicon, ≤1% manganese, 9.5-12% chrominum, ≤0.6% nickel, 0.1-0.3% vanadium, 0.01-0.2% niobium, 0.01-0.2% tantalum, 0.01-0.1% nitrogen, ≤0.5% molybdenum, 0.9-3% tungsten, ≤2.5% cobalt, and the balance other elements. Further, this cast steel is a high strength high chromium cast steel for high temp. pressure vessel, which holds the weldability of the conventional high chromium cast steel and is increased in strength at high temp.;COPYRIGHT: (C)1995,JPO