P/M HIGH SPEED TOOL STEEL EXCELLENT IN WEAR RESISTANCE AND CHIPPING RESISTANCE AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To provide a P/M high speed tool steel-excellent in chipping resistance as well as in wear resistance. ;SOLUTION: This steel is an Mo type high speed tool steel containing Ni and Co, and further, Nb is contained by 0.5-2.0wt.% and the average grain size and the maximum grain size of carbides are regulated to 0.40-0.80μm and ≤5μm, respectively. Moreover, at the time of producing the P/M high speed tool steel, it is recommened that the grain size regulation of carbides is performed by soaking treatment.;COPYRIGHT: (C)1997,JPO