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Alloy tool steel and its producing method and mold using it
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A kind of alloy tool steel, quality technology, applied in the field of alloy tool steel and its manufacture and use of molds, can solve the problems of insufficient strength, low toughness, unable to achieve full life and so on
Inactive Publication Date: 2007-12-26
DAIDO STEEL CO LTD
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Problems solved by technology
[0006] However, even in this proposed cold work die steel, the quenching temperature is about 1140°C, so the problem that heat treatment conditions must be separately set as in the above-mentioned Matrix high-speed steel has not been solved.
[0007] In addition, with the improvement of hot forging and warm forging technology in recent years, conventional dies have problems such as insufficient strength, insufficient life, low toughness, and early failure.
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Embodiment 1
[0100] With a vacuum induction furnace of 150Kg, the steels of the examples of the present invention and the comparative examples shown in Table 2 of the composition shown in the following Table 1 were smelted and cast into ingots. The forging ratio is extended forging. From the material produced in this way, hardness test specimens, 10R Charpy impact test specimens, test specimens for Okoshi wear testers, and the following heat-treated bending specimens were produced. The heat treatment characteristic curves shown in Fig. 1 and Tables 3 and 4 Quenching and tempering are carried out at a certain temperature. The hardness, impact value, wear resistance, and heat treatment bending tests were carried out on these samples according to the following methods, and the results are shown in Table 3 and Table 4, and in Figs. The results show the relationship between heat treatment hardness-impact value, heat treatment hardness-wear resistance, quenching temperature-heat treatment bendi...
Embodiment 2
[0129] In the same manner as in the above-mentioned first example, steel samples of the examples of the present invention and the comparative examples shown in Table 5 having the composition shown in Table 6 below were produced. Furthermore, quenching and tempering were performed at the temperature shown in the heat treatment characteristic curve shown in FIG. 1 and Table 7 and Table 8. These samples were used to carry out hardness, impact value, wear resistance, and heat treatment bending tests according to the following methods, and the results are shown in Table 7 and Table 8, and in Figures 6 to 9, Table 7 and Table 8 The results show the relationship between heat treatment hardness-impact value, heat treatment hardness-wear resistance, quenching temperature-heat treatment bending index, impact value-wear resistance.
[0130] As shown in Table 5, high-speed tool steel (q~s) Weq and V additions are large. Cold work die steel (k~p) has a large amount of Cr added, and C is r...
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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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