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Die steel and preparation method thereof

A technology for die steel and round steel, applied in the field of die steel and its preparation, can solve the problems of easy cracking and failure of the steel surface, and achieve the effects of reliable surface cracks, increased strength and improved surface quality

Active Publication Date: 2022-06-21
BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Die steel belongs to high-alloy steel, which is very sensitive to the surface quality, and it is easy to crack during the production process, resulting in failure of the steel surface

Method used

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  • Die steel and preparation method thereof
  • Die steel and preparation method thereof
  • Die steel and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0058] The present invention also provides a preparation method for preparing the above-mentioned die steel, the preparation method mainly includes: continuous casting, slow cooling or stress annealing, descaling, heating and rolling, and spheroidizing annealing.

[0059] Since the die steel is high alloy steel with poor deformation resistance, it is easy to change the mold flux performance during the casting process, affecting the flux effect and increasing the risk of cracking of the slab; ±1% Al 2 O 3 , and containing a mass percentage of 67±3% (SiO 2 +CaO) mold flux is beneficial to improve the risk of slab cracking. Moreover, during continuous casting, the principle of small amount and multiple times can be used to continuously replenish the mold flux, which can effectively improve the risk of slab cracking.

[0060] In subsequent production, slow cooling or stress annealing of the slab can be ensured according to the temperature of the slab. When the slab temperature...

Embodiment 10-12

[0105] The components of Examples 10-12 are consistent with those of Example 4, and only refer to the process in Table 6 for processing

[0106] Table 6

[0107]

[0108] To sum up, the die steel of the present invention has high strength, good wear resistance and heat resistance, and has good surface quality.

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Abstract

The invention relates to the technical field of die steel, in particular to die steel and a preparation method thereof. According to the die steel, the strength, the wear resistance and the heat resistance are improved by adjusting the component proportion, and the surface quality of the die steel is improved; according to the preparation method of the die steel, the slow cooling step or the stress annealing step is adopted according to different casting blank temperatures, so that the cooling process can be accurately and reliably controlled, and the problem of casting blank cracking caused by large structural stress and thermal stress formed in the cooling process is solved; moreover, during heating and rolling, the corresponding heating temperature and time can be adjusted according to different content ratios of Cr, Mo and V and the diameter of rolled round steel, so that the alloy content and the rolling specification are reliably matched with the heating step, it is ensured that surface cracks are reliably controlled, and then the problem of steel surface failure is solved.

Description

technical field [0001] The invention relates to the technical field of die steel, in particular to a die steel and a preparation method thereof. Background technique [0002] Die steel is usually used to manufacture cold stamping dies, hot forging dies, die casting dies and other steel grades. [0003] Die steel belongs to the high-alloy steel category, which is very sensitive to surface quality and is prone to cracking during the production process, resulting in failure of the steel surface. SUMMARY OF THE INVENTION [0004] The purpose of the present invention is to provide a die steel and a preparation method thereof. The obtained die steel has high strength, good wear resistance and heat resistance, and improves the surface quality of the die steel. [0005] The present invention is realized in this way: [0006] In a first aspect, the present invention provides a kind of die steel, calculated by weight percentage, comprising the following components: [0007] C: 0....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46B22D11/00C21D8/00
CPCC22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/44C22C38/001B22D11/001C21D8/005Y02P10/20
Inventor 刘年富张正波胡昭锋邓湘斌廖美华吴学兴何健楠
Owner BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD