Alloy tool steel and its producing method and mold using it

Abstract

To provide alloy tool steel having a quenching temperature lower than that of conventional matrix high speed steel and also having the same characteristics such as hardness and toughness after heat treatment, as those of conventional alloy tool steel, and to provide its manufacturing method and a die using it. The alloy tool steel has a composition which contains prescribed amounts of C, Si, Mn, P, S, Cu, Ni, Cr, Mo or / and W, V, Al, O and N and further contains prescribed amounts of one or more elements among Co, Nb, Ti, B, Ta, Zr, Pb, Bi, Ca, Te, Se, REM and Mg and has the balance Fe with inevitable impurities and in which inequality -0.2<[Delta]C<0.2 (where [Delta]C=C-(0.06*Cr+0.063*Mo+0.033*W+0.2*V+0.1*Nb)) is satisfied and the value of Lc defined by equation Lc=(8.8*Mo+5.9*W+50*V+40*Nb) / (6*Cr) is made to 1.0 to 2. (C)2004,JPO.

Description

technical field

[0001] The present invention relates to an alloy tool steel suitable for various tools used in hot or cold die forging, forging, upsetting, shearing, etc., its manufacturing method, and a die using the same. Background technique

[0002] Historically, various tools used in forging, forging, upsetting, shearing, etc. with a hardness of 55HRC or above have mainly used cold work die steel, Matrix high-speed steel, and some high-speed tool steel. In addition, with the improvement of hot forging and warm forging technology in recent years, high-toughness Matrix high-speed steel and the like are also used in hot forging and warm forging.

[0003] As we all know, the Matrix high-speed steel used in the above-mentioned various applications is based on the high-speed tool steel and suppresses the amount of carbides as much as possible (steel with a composition similar to the matrix of the high-speed tool steel), for example, C Fe Composed of steel, etc. (for example...

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