PRODUCTION OF NON-HEAT TREATED STEEL FOR HOT FORGING AND HOT FORGED NON-HEAT TREATED ARTICLE, AND HOT FORGED NON-HEAT TREATED ARTICLE

摘要

PURPOSE: To provide a material for bainitic hot forged non-heat treated steel parts, having high strength and high toughness in an as-hot-forged state and capable of induction hardening. ;CONSTITUTION: This steel is a non-heat treated steel for hot forging, having a composition which consists of, by weight, 0.30-0.60% C, 0.20-0.90% Si, 1.60-3.00% Mn, 0.05-2.00% Cr, 0.005-0.050% Ti, 0.005-0.050% Al, 0.0080-0.0200% N, further either or both of 0.01-0.30% V and 0.01-0.30% Nb, and the balance Fe with inevitable impurities and in which carbon equivalent Ceq. is regulated to 0.82%. Because of high strength and high toughness and capability for induction hardening, the miniaturization of parts is made possible and this steel can contribute to weight reduction of vehicle, etc., fuel consumption saving, and the cost reduction.;COPYRIGHT: (C)1996,JPO