WEAR RESISTANT STEEL WITH EXCELLENT TOUGHNESS AND RUST RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide wear resistant steel having a high toughness and excellent rust resistance and high quench-and-temper hardness and suitable for an automobile engine member.;SOLUTION: The wear resistant steel with excellent toughness and rust resistance has a composition consisting of, by weight, 0.4-0.6% C, 1.0% Si, ≤1.0% Mn, 6.0-11.0% Cr, 0.001-0.10% Al, 0.020-0.10% N and the balance Fe with inevitable impurities, and further, the area ratio of old austenite crystal grains of ≤20 μm grain size comprises ≥80% of a quenched-and- tempered structure. In addition to the above, the ratio between Al and N satisfies the relation of N/Al3.0, 4.0% Mo is further satisfied, and further, 0.001-0.010% B, one or more kinds among 0.05-0.50% S, 0.03-0.30% Pb and 0.03-0.30% Bi, and also one or more kinds among 0.02-1.00% Ti, 0.02-1.00% Nb and 0.02-1.00% V are incorporated.;COPYRIGHT: (C)2001,JPO