High speed tool steel, and manufacturing method therefor

Details High speed tool steel, and manufacturing method therefor High speed tool steel, and manufacturing method therefor

1997-05-08

1999-11-02

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148544, 148545, 148546, 148547, 164 46, 164 97, 164461, 164479, B21J 100, C21D 500

Patent

active

059762772

ABSTRACT:
A high speed tool steel and a manufacturing method therefor are disclosed, in which carbides are formed in the matrix in a uniform manner, thereby obtaining a high toughness and a high abrasion resistance. The high speed tool steel according to the present invention includes 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%. The final structure has carbides uniformly distributed within a martensite matrix, which are mainly MC and M.sub.6 C carbides. The method includes the steps of melting the above-defined alloy composition, gas spraying the melted alloy to form a bulk material, heat treating the bulk material to decompose the M.sub.2 C carbides to stabilize M.sub.6 C carbides and hot working the heat treated bulk material to a desired shape.

REFERENCES:
patent: 4194900 (1980-03-01), Ide et al.
patent: 5343926 (1994-09-01), Cheskis et al.
Japanese Patent Laid-Open No. Sho 55-38961 Abstract, 1 p., (English language), Mar. 18,1980.
Korean Patent Laid-Open No. 96-21250 Abstract, 1 p.,(English language), Jul. 18, 1996.

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