H13 steel vacuum time-control quenching heat treatment technique

A cold heat treatment and vacuum technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problem of slow cooling speed affecting quenching effect, etc., and achieve the effect of improving service life, improving impact toughness, and improving quenching quality

Inactive Publication Date: 2008-02-13
上海市机械制造工艺研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a special heat treatment process that can effectively improve the impact toughness and service life of H13 steel moulds. This process uses unconventional quenching medium to effectively solve the problem that the quenching cooling speed is slow and the quenching effect is affected. At the same time, the danger of cracking is avoided through time control and other technological methods

Method used

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Examples

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with specific embodiment:

[0013] Take a 100×100×100mm H13 steel sample and heat it in a vacuum furnace to 1050°C for 100 minutes, then remove it from the furnace and let it cool in salt water for 1 to 5 minutes, take it out of the salt water and put it in an oil tank, and cool it for 6 to 8 minutes The oil is air-cooled, and finally tempered to the required hardness range.

[0014] Concrete embodiment parameter value is as follows table

[0015] Example

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PUM

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Abstract

The invention discloses a time-controlled sudden cooling vacuum heat treatment process for H13 steel, which includes heating and heat preserving, quenching and tempering; the quenching media for quenching after heating and heat preserving is salt water containing 5 to 10 percent NaC1, and the quenching treatment lasts for 1 to 5 minutes. The invention adopts a special time-controlled sudden cooling process, which not only prevents the danger of cracking during quenching of the salt water, but also greatly improves the quenching quality, so as to effectively improve the impact toughness of the H13 steel after tempering, and thus greatly extends the service life of the mould.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a vacuum heat treatment process for H13 steel. Background technique [0002] The common failure modes of forging dies are cracking and wear, and improving the strength and toughness may greatly extend its life. H13 steel is a commonly used steel for die-casting molds. How to improve the impact toughness and service life of H13 steel molds through heat treatment is a problem that people have been looking forward to solving. [0003] At present, vacuum high-pressure gas quenching furnace has been widely used in heat treatment of molds, and the main furnace used in China is a gas quenching furnace with a cooling pressure of 6 bar. Because of its low cooling speed, the heat treatment effect of forging molds is not ideal. Abroad, increase the cooling pressure to 10 bar, 20 bar or switch to strong cooling gas to increase the cooling rate of gas quenching. This method is costly and difficul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/60C21D11/00
Inventor 吴怀成王丽莲卢军石江龙田华郭健
Owner 上海市机械制造工艺研究所有限公司
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