Patent ID: 8241558

Claim:
A high-Cr, high-Ni, heat-resistant, austenitic cast steel comprising as main components C, Si, Mn, Cr, Ni, W and/or Mo, and Nb, the balance being substantially Fe and inevitable impurities, N being 0.01-0.5%, Al being 0.008-0.23%, and O being 0.035-0.07% by weight, wherein Cr is 15-30%, Ni is 6-30%, Nb is 1.01-5% and (6O+N) is 0.6% or less by weight, and wherein it has a 0.2% yield strength of 50 MPa or more and a tensile strength of 105 MPa or more at 1050° C., and a room-temperature elongation of 2.0% or more.