Heat treatment composite process and die steel obtained according to heat treatment composite process

A composite process and die steel technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of short service life of die-casting molds, uneven distribution of carbon and alloy components, etc., to improve toughness, improve Die melting resistance and thermal fatigue performance, the effect of improving thermal stability

Inactive Publication Date: 2020-06-12
重庆优特模具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem that the current domestic hot work die steel includes coarse primary carbide and alloy carbide segregation, resulting in uneven distribution of car

Method used

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  • Heat treatment composite process and die steel obtained according to heat treatment composite process
  • Heat treatment composite process and die steel obtained according to heat treatment composite process
  • Heat treatment composite process and die steel obtained according to heat treatment composite process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0061] Example 2 and Example 7 adopt the process of tissue pretreatment + conventional quenching, and the service life of the two groups is 2000 and 2900 pieces respectively. It can be seen that compared with Example 1 and Example 6, the mold steel that has undergone tissue pretreatment is the same under other conditions. In this case, the life expectancy is greatly improved.

Embodiment 3

[0062] Example 3 and Example 8 adopt conventional quenching + place in a low temperature environment of -150°C for 15 hours for ultra-cryogenic treatment, and the service life of the two groups is 2500 and 2600 pieces respectively. H13 and 1.2344 die steel, under other conditions being the same, in the die steel structure of embodiment 4 and embodiment 9, the retained austenite AR (unit %) is 12 and 11 respectively, and the life after comparison is larger improve.

Embodiment 4

[0063] Example 4 and Example 9 adopt the metal treatment method of tissue pretreatment + conventional quenching + placing in a low temperature environment of -150°C for 15 hours for ultra-cryogenic treatment. Example 6, H13 and 1.2344 die steels placed in a low-temperature environment at -150°C for 15 hours for ultra-cryogenic treatment, under the same conditions, in the die steel structures of Examples 4 and 9, retained austenite AR (unit %) is 1.7 and 1.8 respectively, and the life expectancy after comparison is greatly improved.

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Abstract

The invention provides a heat treatment composite process and die steel obtained according to the heat treatment composite process. The heat treatment composite process comprises the following steps of S1 tissue pretreatment: before shipping a die steel raw material from a factory, adopting a tissue pretreatment method which comprises the following steps of in a first stage, heating the die steelraw material in a vacuum environment to 550 DEG C and performing thermal insulation for 30 minutes, heating again to 850 DEG C and carrying out thermal insulation for 60 minutes, continuously heatingthe die steel raw material to 1150 DEG C and then performing thermal insulation for 60 minutes, introducing liquid nitrogen in the die steel raw material in the vacuum environment, and quenching the heated die steel raw material; and in a second stage: heating the die steel raw material obtained through the treatment in the previous procedure to 720 DEG C, then performing thermal insulation for 60minutes, and tempering to room temperature; S2 conventional quenching; and S3: placing the die steel raw material obtained through the treatment in the step 2 in a low temperature environment of -150to -200 DEG C for 15-24 hours for cryogenic treatment. By using the heat treatment process, the service life of die steel can be prolonged.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to a heat treatment composite process and die steel thereof. Background technique [0002] Hot work die steel requires materials with high hardenability, high temperature strength, high wear resistance, high toughness, high thermal cracking resistance and high melting loss resistance. [0003] H13 steel is the most widely used and most representative hot work die steel / die casting die steel. Due to the large differences in the structure and composition of H13 at home and abroad, but the heat treatment process has not been modified according to the composition of domestic H13, making the domestic The defect of H13 has not been improved, resulting in a shorter service life of the die-casting mold. According to relevant information, the average service life of Japanese aluminum alloy die-casting molds is about 110,000 times, and the service life of aluminum alloy die-cast...

Claims

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Application Information

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IPC IPC(8): C21D1/19C21D6/04C23C8/26
CPCC21D1/19C21D6/04C21D2211/008C23C8/26
Inventor 雷佳乐朱裕华
Owner 重庆优特模具有限公司
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