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High-strength toughness cold working die steel and method of producing the same

A cold work die steel, high-strength and toughness technology, applied in the field of alloy steel manufacturing process, can solve the problems of anisotropy of mechanical properties and physical properties, increased tendency of quenching crack formation, and poor grindability and abrasiveness. , to achieve the effect of improving macro and micro structure, hardness performance and impact resistance, and dense structure

Active Publication Date: 2008-05-21
上大鑫仑材料科技(上海)有限公司
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Problems solved by technology

[0007] (2) Performance of Cr12MoV: high hardness and high wear resistance, low impact toughness
[0008] (3) Deficiencies of Cr12MoV: Ribbon carbides cause obvious anisotropy in the mechanical and physical properties of steel, and reduce impact toughness
The uneven distribution of carbides makes the grinding and abrasiveness of steel worse, and the tendency to form quenching cracks increases

Method used

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  • High-strength toughness cold working die steel and method of producing the same

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Embodiment 1

[0028] Embodiment 1: In the present embodiment, the chemical composition and weight percentage of alloy steel are as follows:

[0029] C 0.95%, Cr 9.5%, Mo 2.0%, V 1.0%, Si 1.0%, P<0.02%, S<0.02%, Fe balance.

[0030] The preparation process and steps of alloy steel in the present embodiment are as follows:

[0031] (a) Melting: After the alloy is designed according to the above composition, it is smelted according to the traditional conventional method. The alloy charge according to the above formula is placed in an intermediate frequency induction furnace or an electric arc furnace, and is smelted at a temperature above 1500°C, and then the steel ingot is poured into the next one step to use;

[0032] (b) Electroslag remelting: using electric current to generate resistance heat through the electroslag layer to melt the alloy steel base material of the consumable electrode, the liquid metal falls through the slag pool in the form of molten droplets into the metal molten pool...

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Abstract

The invention relates to a high-strength toughness cold-working die steel and a manufacturing method thereof, belonging to the technical field of alloy steel manufacturing technology. The chemical composition and weight percentage of the alloy steel of the present invention: C 0.9~1.0%, Cr 9~10%, Mo 2.0%, V 0.8~1.0%, Si 1.0%, P<0.02%, S<0.02%, Fe surplus quantity. The preparation process and steps of the cold work die steel of the present invention are as follows: (1) smelting, (2) electroslag remelting, (3) annealing, (4) rough forging, (5) re-annealing, (6) spheroidizing annealing , (7) Quenching and tempering. The hardness of the alloy steel prepared by the method of the invention can reach 61-63HRC, and the impact energy AK can reach 61-85J, which is more than three times higher than that of the original Cr12MoV steel.

Description

technical field [0001] The invention relates to a high-strength toughness cold-working die steel and a preparation method thereof, belonging to the technical field of alloy steel manufacturing technology. Background technique [0002] Due to the wide variety of chemical components of cold work die steel, the inhomogeneity of eutectic carbides in high chromium steel increases with the increase of carbon content, resulting in a decrease in the toughness of the steel. [0003] Such as the existing Cr12MoV steel: [0004] (1) The composition of Cr12MoV is shown in the following table: [0005] Chemical composition table of Cr12MoV [0006] C Si S P mn Ni Cr Mo V 1.59 0.35 0.00004 0.0137 0.299 0.08 12.04 0.49 0.29 [0007] (2) Performance of Cr12MoV: It has high hardness and high wear resistance, and low impact toughness. [0008] (3) Deficiencies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22C33/06C21D1/26C21D8/00C21D1/18
Inventor 吴晓春谢殷子
Owner 上大鑫仑材料科技(上海)有限公司
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