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Corrosion resistance Cr14Mo4V plastic mold steel

A technology of plastic mold steel and corrosion resistance, applied in the field of plastic mold steel, can solve the problems affecting corrosion resistance, segregation, grain coarsening, etc., achieve excellent quenching and tempering structure, improve comprehensive performance, and low equipment requirements Effect

Inactive Publication Date: 2019-10-11
湖北长怡特殊材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Mold steel is the most important technical and material basis of the mold industry. The rapid development of my country's automobile, chemical, electronic and other equipment manufacturing industries has greatly promoted the prosperity of the mold industry and the rapid development of the mold steel industry. High purity, high polishing performance, ultra-fine grain structure, high homogeneity, high corrosion resistance, etc. also put forward higher requirements. The content of carbon and chromium in steel is high, and eutectic carbides often exist, and there are problems such as uneven distribution of carbides and serious segregation; in addition, if the quenching temperature of corrosion-resistant plastic mold steel is too low, carbides cannot be fully dissolved, not only Reduce the chromium content in the matrix, affect the corrosion resistance, and reduce the hardness of the steel
However, if the quenching temperature is too high, in addition to coarsening the grains, a large amount of ferrite will be produced to reduce its toughness. Therefore, a heat treatment process for corrosion-resistant plastic mold steel has been explored to make the grains finer. , uniform structure, high hardness and wear resistance, good toughness and strong corrosion resistance are particularly important

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] This embodiment is a corrosion-resistant Cr14Mo4V plastic mold steel, which contains the following components by weight percentage: C: 0.12%, Si: 0.25%, Mn: 0.7%, P: 0.01%, S: 0.01%, Cr: 1.5%, Mo: 1.0%, Ni: 0.2%, V: 0.25%, and the balance is Fe;

[0015] Carry out heat treatment to the steel casting of above-mentioned composition, comprise the following steps:

[0016] Normalizing treatment: heating the steel casting to 1030°C for heat preservation, 8h ≤ heat preservation time ≤ maximum wall thickness mm × 1h / 25mm, during which the internal structure of the steel casting is austenitized, and after the heat preservation time is over, the The steel castings are cooled in two stages. In the first cooling stage, the steel castings are cooled to 650°C at a cooling rate of 15°C / min, and in the second cooling stage, the steel castings are cooled to 650°C at a cooling rate of 3°C / min. 200°C;

[0017] Tempering treatment: heat the above-mentioned normalized steel castings to 7...

Embodiment 2

[0019] This embodiment is a corrosion-resistant Cr14Mo4V plastic mold steel, which contains the following components by weight percentage: C: 0.20%, Si: 0.60%, Mn: 0.9%, P: 0.020%, S: 0.012%, Cr: 1.5%, Mo: 1.2%, Ni: 0.5%, V: 0.35%, and the balance is Fe;

[0020] Carry out heat treatment to the steel casting of above-mentioned composition, comprise the following steps:

[0021] Normalizing treatment: heat the steel casting to 1064°C and keep it warm for 8h ≤ holding time ≤ maximum wall thickness mm × 1h / 25mm. During this period, the internal structure of the steel casting is austenitized. The steel castings are cooled in two stages. In the first cooling stage, the steel castings are cooled to 650°C at a cooling rate of 8°C / min, and in the second cooling stage, the steel castings are cooled to 650°C at a cooling rate of 1°C / min. 200°C;

[0022] Tempering treatment: heat the above-mentioned normalized steel castings to 700°C for heat preservation, 8h ≤ holding time ≤ maximum w...

Embodiment 3

[0024] This embodiment is a corrosion-resistant Cr14Mo4V plastic mold steel, which contains the following components by weight percentage: C: 0.12%, Si: 0.20%, Mn: 0.5%, P: 0.020%, S: 0.012%, Cr: 1.0%, Mo: 0.9%, Ni: 0.1%, V: 0.20%, and the balance is Fe;

[0025] Carry out heat treatment to the steel casting of above-mentioned composition, comprise the following steps:

[0026] Normalizing treatment: heat the steel casting to 1064°C and keep it warm for 8h ≤ holding time ≤ maximum wall thickness mm × 1h / 25mm. During this period, the internal structure of the steel casting is austenitized. The steel castings are cooled in two stages. In the first cooling stage, the steel castings are cooled to 650°C at a cooling rate of 20°C / min. In the second cooling stage, the steel castings are cooled to 650°C at a cooling rate of 3°C / min. 200°C;

[0027] Tempering treatment: heat the above-mentioned normalized steel castings to 730°C for heat preservation, 8h ≤ holding time ≤ maximum wall...

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PUM

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Abstract

The invention discloses corrosion resistance Cr14Mo4V plastic mold steel. The plastic mold steel comprises, by weight percentage, 0.12-0.20% of C, 0.20-0.60% of Si, 0.5-0.9% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.012% of S, 1.0-1.5% of Cr, 0.9-1.2% of Mo, 0.1-0.5% of Ni, 0.20-0.35% of V and the balance Fe. The corrosion resistance Cr14Mo4V plastic mold steel has high corrosion resistance and can meet the requirement of a market of high-grade corrosion resistance plastic molds.

Description

technical field [0001] The invention relates to the technical field of plastic mold steel, in particular to a corrosion-resistant Cr14Mo4V plastic mold steel. Background technique [0002] Mold steel is the most important technical and material basis of the mold industry. The rapid development of my country's automobile, chemical, electronic and other equipment manufacturing industries has greatly promoted the prosperity of the mold industry and the rapid development of the mold steel industry. High purity, high polishing performance, ultra-fine grain structure, high homogeneity, high corrosion resistance, etc. also put forward higher requirements. The content of carbon and chromium in steel is high, and eutectic carbides often exist, and there are problems such as uneven distribution of carbides and serious segregation; in addition, if the quenching temperature of corrosion-resistant plastic mold steel is too low, carbides cannot be fully dissolved, not only Reduce the chromi...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C21D1/28C21D1/18
CPCC21D1/18C21D1/28C22C38/02C22C38/04C22C38/44C22C38/46
Inventor 陈俊波刘鹏涛卢敏
Owner 湖北长怡特殊材料科技有限公司
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