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Quenching and tempering 3Cr2MnNiMo pre-hardening plastic die steel

A plastic mold steel and hard plastic technology, which is applied in the field of plastic mold steel, can solve the problems of unfavorable mold manufacturing industry development, high price, and unsatisfactory cutting performance, and achieve good cutting performance, high hardenability, and comprehensive mechanics. good performance

Inactive Publication Date: 2019-10-01
湖北志联模具科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is exactly at present domestic pre-hardened plastic mold steel 3Cr 2 The cutting performance of MnNiMo is not ideal, and the price of imported products is high, which is not conducive to the development of the mold manufacturing industry. A quenched and tempered 3Cr is provided. 2 MnNiMo pre-hardened plastic mold steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The quenched and tempered 3Cr of this embodiment 2 MnNiMo pre-hardened plastic mold steel, the plastic mold steel contains the following components in weight percentage: C: 0.36%, Mn: 1.30%, Si: 0.30%, Cr: 1.85%, Mo: 0.32%, Ni: 1.0% , the balance is Fe, and the plastic mold steel has a hardness of HRC33; the quenching temperature of the steel billet during the processing of the plastic mold steel is 845 ° C, the holding time is 50 min, and the oil bath is cooled to 60 ° C in air after the quenching furnace is released. To room temperature, immediately enter the tempering furnace for tempering, the tempering temperature is 520°C, the holding time is 30min, the thickness of the steel billet flat is 300mm, and the width is 700mm, which is suitable for manufacturing large molds; the plastic mold steel is in the melting process Is the use of secondary smelting homogeneous desulfurization process.

Embodiment 2

[0014] The quenched and tempered 3Cr of this embodiment 2 MnNiMo pre-hardened plastic mold steel, the plastic mold steel contains the following components in weight percentage: C: 0.32%, Mn: 1.10%, Si: 0.40%, Cr: 1.70%, Mo: 0.40%, Ni: 0.85% , the balance is Fe, and the plastic mold steel has a hardness of HRC30; the quenching temperature of the steel billet during the processing of the plastic mold steel is 830 ° C, the holding time is 60 min, and the oil bath is cooled to 50 ° C in air after the quenching furnace is released. To room temperature, immediately enter the tempering furnace for tempering. The tempering temperature is 530°C, the holding time is 40min, and the steel billet forging round specification is φ100mm, which is suitable for manufacturing small precision molds; the plastic mold steel is used in the melting process. Smelting homogeneous desulfurization process.

Embodiment 3

[0016] The quenched and tempered 3Cr of this embodiment 2 MnNiMo pre-hardened plastic mold steel, the plastic mold steel contains the following components in weight percentage: C: 0.40%, Mn: 1.50%, Si: 0.20%, Cr: 2.00%, Mo: 0.25%, Ni: 1.15% , the balance is Fe, and the plastic mold steel has a hardness of HRC36; the quenching temperature of the steel billet during the processing of the plastic mold steel is 860 ° C, the holding time is 40 min, and the oil bath is cooled to 100 ° C in air after the quenching furnace is released. To room temperature, immediately enter the tempering furnace for tempering, the tempering temperature is 500°C, the holding time is 20min, the billet forging round specification is φ400mm, which is suitable for processing large molds; the plastic mold steel is smelted in the process of secondary melting Homogeneous desulfurization process.

[0017] The cutting performance of the plastic mold steel produced in Examples 1-3 of the present invention can b...

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Abstract

The invention discloses a quenching and tempering 3Cr2MnNiMo pre-hardening plastic die steel. The quenching and tempering 3Cr2MnNiMo pre-hardening plastic die steel comprises the following componentsof, in percentage by weight, 0.32%-0.40% of C, 1.10%-1.50% of Mn, 0.20%-0.40% of Si, 1.70%-2.00% of Cr, 0.25%-0.40% of Mo, 0.85%-1.15% of Ni and the balance Fe. The plastic die steel has the hardnessof HRC30-36, the quenching temperature of a steel billet in the processing process of the plastic die steel is 830-860 DEG C, the plastic die steel is subjected to oil bath cooling to 50-100 DEG C after being discharged from a quenching furnace and is air-cooled to room temperature, and then immediately enters a tempering furnace for tempering at the temperature of 500-530 DEG C to prepare the plastic die steel with the hardness of HRC30-36. The die steel is suitable for manufacturing super-large high-precision plastic die and mirror surface polishing large dies, and is especially suitable forprocessing plastic dies of products such as communication household appliances.

Description

technical field [0001] The invention relates to the technical field of plastic mold steel, in particular to a quenched and tempered 3Cr 2 MnNiMo pre-hardened plastic mold steel. Background technique [0002] Currently commonly used pre-hardened plastic mold steel 3Cr 2 MnNiMo has the following problems in its cutting performance: 1. The non-metallic inclusions in the steel affect the cutting performance and seriously damage the cutting performance; 2. The processing technology will cause the composition segregation in the steel, which is not conducive to the surface processing quality and performance of the steel; 3. Poor mirror polishing, not suitable for processing precision molds. In view of the current domestic pre-hardened plastic mold steel 3Cr 2 The polishing performance and mechanical properties of MnNiMo are not up to the requirements, and cannot meet the needs of the domestic mold manufacturing industry. The high price of imported mold steel is not conducive to ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/44C21D1/18
CPCC21D1/18C22C38/02C22C38/04C22C38/44
Inventor 王晓鹏程爱萍
Owner 湖北志联模具科技有限公司
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