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High-toughness and high-hardness die steel and preparation method thereof

A high-hardness, high-toughness technology, applied in the field of die steel manufacturing, can solve the problem that the performance of die steel is difficult to meet the requirements

Active Publication Date: 2020-12-01
TIANJIN CISRI HARDER MATERIALS & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process produces high-toughness and high-hardness mold steel, as the working conditions of mold steel become more and more complex, the performance requirements of mold steel are also getting higher and higher, and the performance of mold steel prepared before is difficult to meet the requirements.

Method used

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  • High-toughness and high-hardness die steel and preparation method thereof
  • High-toughness and high-hardness die steel and preparation method thereof

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preparation example Construction

[0035]The present invention also provides a method for preparing the high-toughness and high-hardness mold steel described in the above technical solution, comprising the following steps:

[0036] (1) smelting after mixing alloy raw materials to obtain steel ingots;

[0037] (2) forging the steel ingot obtained in the step (1) to obtain a forged alloy;

[0038] (3) heat-treating the wrought alloy obtained in the step (2) to obtain a mold steel with high toughness and high hardness.

[0039] In the invention, alloy raw materials are mixed and smelted to obtain steel ingots. In the present invention, there is no special limitation on the type and source of the alloy raw materials, and the raw materials known to those skilled in the art that can provide the above alloy elements can be used. In the present invention, there is no special limitation on the operation of mixing the alloy raw materials, and the technical solutions for preparing the mixed materials well known to those...

Embodiment 1

[0055] In terms of mass percentage, the composition of the high toughness and high hardness die steel is: C: 0.78%, Si: 0.3%, Mn: 0.5%, Cr: 5.1%, Mo: 2.4%, V: 0.55%, P<0.02 %, S<0.001% and the balance of Fe;

[0056] The preparation method of the high toughness and high hardness die steel is:

[0057] (1) Carry out the electric furnace smelting after batching is mixed according to the above-mentioned weight percentage, control tapping P0.018wt%, then pass through LF furnace refining, control S 0.004wt%; carry out degassing through VD furnace again, control the oxygen content in the steel 0.0025wt% , the H content is 0.0002wt%; pouring is then carried out under the protection of argon; and then through the atmosphere protection electroslag remelting, the oxygen content is reduced to 0.002wt%, the sulfur content is reduced to 0.0008wt%, and the steel ingot is obtained;

[0058] (2) Forging the steel ingot obtained in the step (1), first forging the blank, the heating temperatur...

Embodiment 2

[0061] In terms of mass percentage, the composition of the high toughness and high hardness die steel is: C: 0.75%, Si: 0.25%, Mn: 0.55%, Cr: 5.15%, Mo: 2.45%, V: 0.50%, P<0.02 %, S<0.002% and the balance of Fe;

[0062] The preparation method of the high toughness and high hardness die steel is:

[0063] (1) According to the above-mentioned weight percentage, carry out electric furnace smelting after batching and mixing, control tapping P0.017wt%, then refine through LF furnace, control S 0.0045wt%; carry out degassing through VD furnace again, control oxygen content in steel 0.0025wt% , the H content is 0.00012wt%; pouring is then carried out under the protection of argon; and then through the electroslag remelting under the protection of the atmosphere, the oxygen and sulfur contents are all reduced to 0.001wt%, and the steel ingot is obtained;

[0064] (2) Forging the steel ingot obtained in the step (1), first forging the blank, the heating temperature of the forging bla...

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Abstract

The invention provides high-toughness and high-hardness die steel. The high-toughness and high-hardness die steel is prepared from the components in percentage by mass: 0.70%-0.85% of C, 0.10%-0.40% of Si, 0.30%-0.70% of Mn, 4.85%-5.30% of Cr, 2.25%-2.55% of Mo, 0.40%-0.70% of V, less than 0.02% of P, less than 0.003% of S and the balance of Fe. According to the high-toughness and high-hardness die steel, the content of C is set between the components of the hot-work and cold-work die steel, so that the hardenability and hardenability of the material can be improved, alloy carbide can furtherbe formed, and the wear resistance is improved; the Si content is reduced, so that the toughness of the material is improved; and the content of Cr is kept the same as that of Cr in the hot-work die steel H13, meanwhile, the content of V is reduced, the content of Mo is increased, generation of V-containing eutectic carbide can be reduced, the influence on toughness is reduced, and it is guaranteed that the material has good tempering softening resistance.

Description

technical field [0001] The invention belongs to the technical field of die steel manufacturing, and in particular relates to a high-toughness and high-hardness die steel and a preparation method thereof. Background technique [0002] Die steel is a type of steel used to manufacture cold dies, hot forging dies, die-casting dies, etc. It is divided into three types: cold work die steel, hot work die steel and plastic die steel, which are used for forging, stamping, extrusion, die-casting, etc. . Due to the different uses of various molds and complex working conditions, it is necessary for the mold steel to have high hardness and high toughness to meet the use of different working conditions. [0003] At present, the hardness and toughness of the die steel are usually improved by adjusting the component content of the die steel. For example, a high-hardness and high-toughness cold-work die steel is recorded in the patent CN104561802A, and its chemical composition weight percen...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C21D1/32C21D6/00C21D8/00C22C33/04
CPCC21D1/32C21D6/002C21D6/005C21D6/008C21D8/005C22C33/04C22C38/002C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 王飞张明明于新强
Owner TIANJIN CISRI HARDER MATERIALS & TECH
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