Heat treatment process for die steel

A technology of die steel and preliminary heat treatment, which is applied in the field of steel heat treatment process, can solve problems such as brittle cracking, and achieve the effects of eliminating quenching stress, reducing thermal stress, high hardness and wear resistance

Inactive Publication Date: 2016-06-22
重庆基石机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, 7Cr7Mo2V2Si steel has the disadvantage of brittle cracking due to carbide segregation. In order to ensure product quality, it is necessary to make further improvements.

Method used

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Embodiment Construction

[0009] Below in conjunction with embodiment the present invention will be further described, and its operating steps are as follows:

[0010] A heat treatment process for mold steel, the process method comprising the following steps:

[0011] (1) Preliminary heat treatment: Isothermal spheroidizing annealing should be carried out immediately after forging, heating temperature: 840-860°C, heat preservation for 2-4h; then cool to 720-740°C, hold constant temperature for 4-6h, cool to below 500°C and leave the furnace for air cooling ;

[0012] (2) Quenching and tempering: Quenching temperature 1100-1150°C, oil cooling; tempering temperature 530-540°C, tempering 2-3 times, each holding 1.0-2.0h, hardness 57-63HRC.

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Abstract

The invention discloses a heat treatment process for die steel. The heat treatment process for the die steel is characterized in that the heat treatment process comprises the following steps that 1, preheating treatment is conducted, specifically, isothermal spheroidizing annealing needs to be conducted immediately after the die steel is forged, the heating temperature is 840 DEG C-860 DEG C, and heat preservation lasts for 2-4 h; then the die steel is cooled to 720 DEG C-740 DEG C, and the constant temperature lasts for 4-6 h; the die steel is subjected to furnace cooling till to be 500 DEG C or blow, taken out of a furnace and subjected to air cooling; and 2, quenching and tempering are conducted, specifically, the quenching temperature is 1100 DEG C-1150 DEG C, and oil cooling is conducted; the tempering temperature is 530 DEG C-540 DEG C, tempering is conducted for two to three times, heat preservation lasts for 1.0-2.0 h each time, and the hardness of the die steel is 57-63 HRC. According to the heat treatment process for the die steel, the hardness and the abrasion resistance of the die steel can be improved.

Description

technical field [0001] The invention belongs to the field of steel heat treatment technology, in particular to a mold steel heat treatment technology. Background technique [0002] 7Cr7Mo2V2Si is a high-strength and toughness cold work die steel. Compared with Cr12 cold work die steel and W6Mo5Cr4V2 high-speed steel, it has higher strength and toughness, and has better wear resistance. The processability of cold and hot processing is excellent, the deformation of heat treatment is small, and the versatility is strong. 7Cr7Mo2V2Si steel is suitable for manufacturing high-load cold extrusion, cold heading, cold stamping dies, etc. However, 7Cr7Mo2V2Si steel has the disadvantage of brittle cracking due to carbide segregation. In order to ensure product quality, further improvement is necessary. Contents of the invention [0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a die steel heat treatment process, which can impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00
Inventor 不公告发明人
Owner 重庆基石机械有限公司
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