HIGH STRENGTH AND LONG LIFE STEEL FOR INDUCTION HARDENING EXCELLENT IN DELAYED FRACTURE RESISTANCE AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To produce steel for induction hardening having high strength and excellent in delayed fracture resistance and rolling fatigue life characteristics, and to provide a method for producing the same. ;SOLUTION: This steel for induction hardening having high strength and excellent in delayed fracture resistance and rolling fatigue life characteristics contains, by weight, 0.30 to 0.80% C, 0.05 to 0.50% Si, 0.2 to 2.0% Mn, 0.05 to 0.20% Ti, 0.010 to 0.050% Al, ≤0.0120% N and ≤12 ppm O, and the balance Fe with inevitable impurities, or moreover contains one or ≥ two kinds selected from 0.1 to 2.0% Ni, 0.20 to 2.0% Cr and 0.05 to 1.0% Mo to the above steel components, and Ti carbides and Ti carbonitrides of ≤70 nm dimensions are finely dispersed into the steel.;COPYRIGHT: (C)2000,JPO