Patent ID: 6200394
Filing Date: 2001-03-13
Classification: B22F,C21D,C22C

Abstract:
A high speed tool steel, consisting essentially of:a basic composition of W.sub.a Mo.sub.b Cr.sub.c Co.sub.d V.sub.x C.sub.y Fe.sub.z where the subscripts meet in weight %: 5.0%.ltoreq.a.ltoreq.7.0%, 4.0%.ltoreq.b.ltoreq.6.0%, 3.0%.ltoreq.c.ltoreq.5.0%, 6.5%.ltoreq.d.ltoreq.9.5%, 2.2%.ltoreq.x.ltoreq.8.3%, 1.1%.ltoreq.y.ltoreq.2.18%, and 66.52%.ltoreq.z.ltoreq.73.7%, wherein x and y come within ranges of x.gtoreq.2.2.y.gtoreq.1.1. y.gtoreq.-0.06+0.21x, y.ltoreq.2.8-0.13x, and y.ltoreq.1.26+0.2x;a final structure of said tool steel having carbides uniformly distributed within a martensite matrix; andmain ingredients of said carbides being MC and M.sub.6 C.