HEAT RESISTANT CAST STEEL IMPROVED IN CREEP FRACTURE STRENGTH

摘要

PURPOSE: To manufacture a heat resistant cast steel improved in creep fracture strength by preparing a heat resistant cast steel having a specified compsn. in which each content of C, Nb and Hf is prescribed. ;CONSTITUTION: Aheat resistant cast steel contg., by weight, 0.3 to 0.6% C, ≤3% Si, ≤2% Mn, 22 to 30% Cr, 30 to 55% Ni, 0.2 to 1.5% Nb and 0.05 to 1% Hf, furthermore contg., at need, one or two kinds of 0.01 to 0.5% Ti and 0.01 to 0.5% Zr and the balance of substantially Fe is prepd. In this way, the heat resistant cast steel improved in high temp. creep fracture strength while its required aging properties, carburizing resistance and weldability are secured can be obtd.;COPYRIGHT: (C)1993,JPO&Japio