HOT WORKING TOOL STEEL EXCELLENT IN WEAR RESISTANCE

摘要

PROBLEM TO BE SOLVED: To produce a hot working tool steel having all of machinability, toughness, and high temperature strength and capable of reducing manufacturing costs and prolonging tool life when used for dies, mandrels, and the like, for use in hot forging, extrusion and die casting. ;SOLUTION: This hot working tool steel excellent in wear resistance has a composition which consists of, by weight, 0.40-0.60% C, 0.20-1.20% Si, 0.20-1.50% Mn, 1.00-2.00% Ni, 1.00-2.70% Cr, 0.30-2.00% Mo, 0.10-0.80% V, 0.005-0.10% Al and the balance Fe with inevitable impurities and in which P, S and N among the impurities are made to ≤0.015% P, ≤0.005% S and ≤0.015% N. Further, the hardened structure of this steel is composed of martensite and bainite, and the amount of bainite in the above structure is 5-80%.;COPYRIGHT: (C)2001,JPO