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100-260 mm-thick tempering-state prehardened plastic mold steel plate and manufacturing method thereof

A plastic mold and pre-hardening technology, which is applied in the field of heat-treated mold steel plates, can solve the problems of large hardness differences between the surface and the core, and achieve the effects of improving comprehensive performance, increasing heat preservation temperature, and eliminating local differences

Active Publication Date: 2017-09-19
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the pre-hardened alloy die steel plates used in the market are often combined with Cr-Mo or Cr-Ni-Mo alloys. The plastic die steel plates represented by 3Cr2Mo and 3Cr2MnNiMo in GB / T 1299-2014 are normalized. Higher hardness can be achieved under air-cooling conditions after heat treatment, and then tempered at different temperatures to make the steel plate meet the hardness requirements of users, but such alloy matching and heat treatment methods can only meet the production requirements of thin plates and conventional medium-thick plates , when the thickness exceeds a certain range, there will be a large difference in hardness between the surface and the core. For the production of die steel thick plates, it is difficult to improve the performance stability of the core and ensure the uniformity of the performance of the entire plate.

Method used

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  • 100-260 mm-thick tempering-state prehardened plastic mold steel plate and manufacturing method thereof
  • 100-260 mm-thick tempering-state prehardened plastic mold steel plate and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] The thickness of the pre-hardened plastic mold steel plate suitable for quenching and tempering state involved in this embodiment is 260mm, and its chemical composition is calculated by mass percentage: C: 0.41%, Si: 0.28%, Mn: 0.85%, P: 0.005%, S : 0.002%, Cr: 2.0%, Mo: 0.28%, Als: 0.025%, V+ Ti: 0.12%, and the balance is Fe and unavoidable impurity elements.

[0038] The manufacturing process of the 260mm thick pre-hardened plastic mold steel plate suitable for quenched and tempered state is to configure the smelting raw materials according to the chemical composition of the above-mentioned finished steel plate, and sequentially carry out KR molten iron pretreatment, converter smelting, LF refining, and RH vacuum degassing to obtain The molten steel with high purity, the hydrogen content in the molten steel before continuous casting is less than 1.0ppm, and the molten steel is continuously cast into a continuous casting slab with a thickness of 450mm by a straight arc ...

Embodiment 2

[0041] The thickness of the pre-hardened plastic mold steel plate suitable for quenching and tempering state involved in this embodiment is 200 mm, and its chemical composition is calculated by mass percentage: C: 0.41%, Si: 0.28%, Mn: 0.85%, P: 0.005%, S : 0.003%, Cr: 2.0%, Mo: 0.24%, Als: 0.025%, V+ Ti: 0.10%, and the balance is Fe and unavoidable impurity elements.

[0042] The manufacturing process of the 200mm thick pre-hardened plastic mold steel plate suitable for quenched and tempered state is to configure the smelting raw materials according to the chemical composition of the above-mentioned finished steel plate, and sequentially carry out KR molten iron pretreatment, converter smelting, LF refining, and RH vacuum degassing to obtain The molten steel with high purity, the hydrogen content in the molten steel before continuous casting is less than 1.0ppm, and the molten steel is continuously cast into a continuous casting slab with a thickness of 450mm by a straight arc...

Embodiment 3

[0045] The thickness of the pre-hardened plastic mold steel plate suitable for quenched and tempered state involved in this embodiment is 180 mm, and its chemical composition is calculated by mass percentage: C: 0.40%, Si: 0.28%, Mn: 0.85%, P: 0.006%, S : 0.003%, Cr: 2.1%, Mo: 0.22%, Als: 0.025%, V+ Ti: 0.08%, and the balance is Fe and unavoidable impurity elements.

[0046] The manufacturing process of the 180mm thick plastic mold steel plate suitable for quenching and tempering pre-hardening is to configure the smelting raw materials according to the chemical composition of the above-mentioned steel plate products, and then carry out KR molten iron pretreatment, converter smelting, LF refining, and RH vacuum degassing in order to obtain The molten steel with high purity, the hydrogen content in the molten steel before continuous casting is less than 1.0ppm, and the molten steel is continuously cast into a continuous casting slab with a thickness of 450mm by a straight arc con...

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Abstract

The invention relates to a 100-260 mm-thick tempering-state prehardened plastic mold steel plate. The steel plate has the following chemical components in percentage by mass: 0.35-0.45 of C, 0.20-0.50 of Si, 0.60-1.00 of Mn, 1.00-2.50 of Cr, 0.20-0.50 of Mo, 0.04-0.15 of V+Ti, 0.01-0.04 of Als, 0.015 or less of P, 0.005 or less of S, and the balance of Fe and inevitable impurities; the steel plate is uniform in performance; the overall hardness difference is not more than 2.0 HRC; and the steel plate reaches NB / T47013.3 plate part I grade requirements by ultrasonic detection. The overall hardness difference is not more than 2.0 HRC; the steel plate reaches NB / T47013.3 plate part I grade requirements by ultrasonic detection; and the total inclusion grade is not higher than 2.5. The chemical components of the mold steel plate are simplified; the improvement is performed from the production process angle; the difference of the steel plate in the thickness direction is reduced; and in particular, the section hardness uniformity is improved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment mold steel plates, and in particular relates to a production process of 100-260 mm thick high-performance quenched and tempered pre-hardened plastic mold steel plates. Background technique [0002] Since entering the 21st century, the rapid expansion of the plastics industry has promoted the development of the domestic mold industry. According to statistics, about 70% of the parts in the electromechanical industry are formed by molds, and more than 80% of the parts in household appliances that use more plastic are Made using moulds. In recent years, plastic products represented by washing machine cylinders, large color TV casings, refrigerator inner cavities, etc. have become more and more large, which has promoted the large-scale development of molds, which directly reflects the thickness requirements of mold steel plates, which are raw materials for molds. . [0003] The performance of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/24C22C38/28C22C38/02C22C38/04C22C38/06C22C33/04B21C37/02
Inventor 黄军何广霞高助忠李经涛葛恒贵吴扬储炜清
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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