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A kind of high hardenability die steel and its preparation process

A technology with high hardenability and preparation technology, which is applied in the field of metallurgy, can solve the problems of affecting the performance of finished products, reducing the hardenability of mold modules, and large differences in hardness, so as to achieve the effect of improving hardenability

Active Publication Date: 2019-06-18
湖北永舟新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic large-section 4Cr13 type (Germany DIN1.2083) pre-hardened stainless plastic mold module products have large differences in surface structure and hardness, which will affect and reduce the hardenability of the mold module, thereby affecting the performance of the finished product

Method used

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  • A kind of high hardenability die steel and its preparation process
  • A kind of high hardenability die steel and its preparation process
  • A kind of high hardenability die steel and its preparation process

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preparation example Construction

[0029] A preparation process for high hardenability die steel, which includes

[0030] Smelting step: using a converter or an electric furnace (EF) to smelt molten iron or scrap steel after pretreatment to obtain molten steel with a suitable C content and less impurities.

[0031] Refining steps: Use LF furnace for refining outside the furnace and then VD vacuum degassing to realize alloying operation and degassing operation. The alloying operation in LF furnace controls the composition of molten steel to C: 0.36 by adding alloying elements %~0.42%, Si: ≤1%, Mn: 0.50%~0.80%, Cr: 12.5%~14.5%, B: 0.0005%~0.005%, Mo: 0.1%~0.45%, and the balance is impurities and Fe; Harmful elements S in impurities: ≤0.015wt%, P: ≤0.025wt%. Preferably, the components are C: 0.36%-0.42%, Si: ≤1%, Mn: 0.50%-0.80%, Cr: 12.5%-14.5%, B: 0.001%-0.003%, and Mo: 0.1%~0.45%, the balance is impurities and Fe; impurities include S: ≤0.015% and P: ≤0.025%. More preferably, the components are C: 0.36% to 0...

Embodiment 1

[0040] The high hardenability die steel of this embodiment is manufactured according to the following steps.

[0041] S1. Smelting step: use an electric furnace (EF) to smelt the pretreated molten iron or steel scrap to obtain molten steel with a suitable C content and less impurities.

[0042] S2. Refining step: use the LF furnace to carry out refining outside the furnace and then perform VD vacuum degassing to realize the alloying operation and degassing operation. The alloying operation in the LF furnace controls the composition of the molten steel to C by adding alloy elements. : 0.36wt%, Si: 0.8wt%, Mn: 0.50wt%, Cr: 12.5wt%, B: 0.0005wt% and Mo: 0.1wt%, the balance is impurities and Fe; harmful elements in impurities S: 0.01 wt%, P: 0.015 wt%.

[0043] S3. Casting step: cooling the molten steel obtained in the refining step for the first time to obtain a first steel ingot. The cooling rate is calculated based on the actual production situation by using the computer finite...

Embodiment 2

[0047] The high hardenability die steel of this embodiment is manufactured according to the following steps.

[0048] S1. Smelting step: use an electric furnace (EF) to smelt the pretreated molten iron or steel scrap to obtain molten steel with a suitable C content and less impurities.

[0049] S2. Refining step: use the LF furnace to carry out refining outside the furnace and then perform VD vacuum degassing to realize the alloying operation and degassing operation. The alloying operation in the LF furnace controls the composition of the molten steel to C by adding alloy elements. : 0.36wt%, Si: 0.9wt%, Mn: 0.70wt%, Cr: 14wt%, B: 0.0005wt% and Mo: 0.35wt%, the balance is impurities and Fe; harmful elements in impurities S: 0.01wt %, P: 0.015 wt%.

[0050] S3. Casting step: cooling the molten steel obtained in the refining step for the first time to obtain a first steel ingot. The cooling rate is calculated based on the actual production situation by using the computer finit...

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Abstract

The invention relates to the metallurgical field, and discloses high hardenability die steel, which comprises the components in percentage by weight: 0.36 percent to 0.42 percent of C, less than or equal to 1 percent of Si, 0.50 to 0.80 percent of Mn, 12.5 percent to 14.5 percent of Cr, 0.0005 percent to 0.005 percent of B, 0.1 percent to 0.45 percent of Mo, and the balance impurities and Fe. The invention further provides a preparation process of the high hardenability die steel. The preparation process comprises a refining step, wherein according to the refining step, the components of molten steel are controlled as follow: 0.16 weight percent to 0.26 weight percent of C, less than or equal to 1 weight percent of Si, 0.5 weight percent to 0.8 weight percent of Mn, 12.5 weight percent to 14.5 weight percent of Cr, 0.0005 weight percent to 0.005 weight percent of B, 0.10 weight percent to 0.45 weight percent of Mo, and the balance impurities and Fe. The high hardenability die steel has better hardenability.

Description

technical field [0001] The invention relates to the field of metallurgy, and in particular to a high-hardenability die steel and a preparation process thereof. Background technique [0002] The manufacturing industry uses a lot of molds, so the demand for mold steel is also increasing. In the molding process, the quality of the mold is self-evident for the quality assurance of the product. The mold has been developing in the direction of precision, large-scale and multi-cavity, and the requirements for the performance of the mold steel are getting higher and higher, especially the requirements for hardenability, strength, corrosion resistance, toughness and surface quality. increase. [0003] Hardenability is an important indicator of die steel, which has a great influence on the uniformity of hardenability and the process of quenching operation. Steels with high hardenability can often use higher cooling rates to ensure smaller quenching stress, reduce quenching deformat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/32C22C38/22C22C38/04C22C38/02C22B9/18C21D8/00
CPCC21D8/005C22B9/18C22C38/02C22C38/04C22C38/22C22C38/32
Inventor 刘建军马陶然陈建兵
Owner 湖北永舟新材料科技有限公司