High speed tool steel produced by sintering powder and method of

Details High speed tool steel produced by sintering powder and method of High speed tool steel produced by sintering powder and method of

1991-10-29

1993-10-12

Walsh, Donald P.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75239, 75240, 75243, 75246, 419 6, 419 11, 419 23, 419 14, 419 28, 419 29, 419 53, C22C 2902

Patent

active

052521192

ABSTRACT:
A high speed tool steel produced by sintering powder, consisting essentially, by weight, of more than 1.5% but not more than 2.2% C, not more than 1.0% Si, not more than 0.6% Mn, 3.0 to 6.0% Cr, an amount of W and Mo in which the content of W+2Mo is in the range of 20 to 30% and in which the ratio of W/2Mo is not less than 1, not more than 5.0% V, 2.0 to 7.0% Nb, the ratio of Nb/V being not less than 0.5, and the balance Fe and incidental impurities, the value of C-Ceq, which Ceq is defined by 0.24+0.033.times.W+0.063.times.Mo+0.2.times.V+0.1.times.Nb, being in a range of -0.20 to 0.05, the density of carbides in the sintered steel having grain size of 2 to 5 .mu.m being in a range of 10,000 to 30,000 pieces/mm.sup.2.

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