High speed tool steel

Details High speed tool steel High speed tool steel

2007-06-12

2007-06-12

Yee, Deborah (Department: 1742)

Metal treatment

Stock

Ferrous

C148S334000, C148S328000, C420S104000, C420S111000, C420S110000

Reexamination Certificate

active

10798320

ABSTRACT:
A high speed tool steel, which is high in impact value and free from variations in tool performance, comprising, by mass %, of: 0.4≦C≧0.9; Si≦1.0; Mn≦1.0; 4≦Cr≧6; 1.5–6 in total of either or both of W and Mo in the form of (½W+Mo) wherein W≦3; 0.5–3 in total of either or both of V and Nb in the form of (V+Nb); wherein carbides dispersed in the matrix of the tool steel have an average grain size of ≦0.5 μm and a dispersion density of particles of the carbides is of ≧80×103particles/mm2.

REFERENCES:
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Patent Abstracts of Japan, Publication No. 02-008347, Jan. 11, 1990; Hitachi Metals.
Patent Abstracts of Japan, Publication No. 04-111962, Apr. 13, 1992; Daido Steel Co., Ltd.
Patent Abstracts of Japan, Publication No. 04-111963, Apr. 13, 1992; Daido Steel Co., Ltd.
Patent Abstracts of Japan, Publication No. 02-125845, May 14, 1990; Hitachi Metals, Ltd.
esp@cenet —Document Bibliography and Abstract; New Nickel-Chromium-Molybdenum-vanadium Hot Work Steel; Patent No. DE19531260; Feb. 27, 1997; Buderus Edelstahlwerke AG (DE).

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