CHROMIUM-CONTAINING STEEL EXCELLENT IN HIGH TEMPERATURE STRENGTH WORKABILITY AND SURFACE PROPERTY

摘要

PROBLEM TO BE SOLVED: To provide a stock applicable to a wide temp. range from high temp. parts to low temp. parts of an exhaust member, excellent in high temp. strength and workability and having good surface properties. ;SOLUTION: This steel has a compsn. contg., by weight, ≤0.02% C, ≤0.10% Si, 0.4 to 0.2% Mn, ≤0.04% P, ≤0.02% S, 3.0 to 20% Cr, ≤1.0% Ni, ≤0.02% N and 0.2 to 1.0% Nb, contg., at need, one or more kinds among ≤0.5% Ti, ≤0.5% Zr, ≤0.5% V, ≤0.5% Al, ≤3.0% Mo, ≤1.0% Cu, ≤0.3% rare earth metals, ≤0.03% Ca and 0.005% B, and the balance Fe with inevitable impurities, and, in the steel before working, the content of Nb as Fe2Nb Laves phases is suppressed to low value.;COPYRIGHT: (C)2000,JPO