PURPOSE: To manufacture a high strength heat resistant steel member having the stable characteristic at the room temp. and high temp. strength by executing heat treatment in the specific temp. condition after forging a steel ingot of the specific composition of 12 Cr series alloy steel.
CONSTITUTION: The 12 Cr series alloy steel. having the composition composed of by wt.%, 0.1-0.2% C, <0.3% Si, 0.1-1.5% Mn, 0.1-1.5% Ni, 9-13% Cr, 0.1-0.3% V, 0.01-0.2% Nb or <0.05% Ta, 0.01-0.1% N, <0.02% Al, <0.5% Mo and 0.9-3% W contained so as to become 0.75≤1/2[W]+[Mo] and 3≤[W]/[Mo] and the balance Fe, is melted by using electro-slag remelting method, etc., to produce the steel ingot having a little segregation and uniform and clean quality. This ingot is formed by hot-working of the forging, etc., at 1000-1200°C and after the formed product is heated at 1000-1150°C and quenched, tempering is executed at 550-750°C. The heat resistant steel member having excellent strength, ductility and toughness at the room temp. and high temp. is manufactured.
| JPH03271316 | METHOD FOR COOLING ROLLED STEEL |
TAKEDA YORIMASA
FUJIKAWA TAKUJI
TAKANO MASAYOSHI
TSUCHIYAMA TOMOHIRO
KOBE STEEL LTD