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Quality optimization process for H13 steel vacuum thermal treatment

A vacuum heat treatment and process technology, used in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of high cost, difficult to popularize and apply, and achieve long service life, improve quenched hardness and impact toughness, and have considerable practical value. and economic value

Inactive Publication Date: 2008-09-03
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

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Problems solved by technology

This method is expensive and difficult to popularize and apply at present

Method used

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Experimental program
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Effect test

Embodiment Construction

[0007] The present invention will be further described below in conjunction with specific embodiment:

[0008] The sample we selected (100×100×100 mm, material H13), the specific heat treatment process is as follows:

[0009] a. Select the treatment piece to load into the furnace;

[0010] b. Heat up to 600°C with the furnace and keep it for a while; then raise the temperature to 800°C and keep it for a while; then raise the temperature to 1050°C and keep it for 100 minutes; then take the sample out of the furnace and put it into the Cool to room temperature in NaCl brine medium;

[0011] c. Finally temper to the required range.

[0012] The quenching medium is selected from brine containing 5%, 7%, 8% and 10% NaCl respectively, and the performance test of the sample after heat treatment is as follows:

[0013] The quenched state hardness is 59.1HRC, 59.8HRC, 60.9HRC and 60.2HRC respectively; the impact toughness values ​​are 10.2J, 11.7J, 12.8J and 12.2J respectively.

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Abstract

The invention discloses a quality optimizing process for vacuum heat treatment of H13 steel, comprising the steps of: heating and heat preserving, quenching and tempering. In the quenching process, the quenching medium is 5-10% brine, and the processing part is cooled in a quenching tank to room temperature and tempered. The process can effectively improve the quenching hardness and impact ductility of a H13 steel mould, so that the mould is more durable, the service life is extended. The process has considerable practical value and economical value.

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] Vacuum high pressure gas quenching furnace has been widely used in heat treatment of die casting molds. However, the main type of furnace currently used in China is a gas quenching furnace with a cooling pressure of 6 bar. Because of its low cooling rate, the heat treatment effect for forging dies 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 difficult to popularize and apply at present. A simple new method of increasing the quenching cooling rate suitable for our national conditions should be studied to improve the impact toughness and service life of the forging die. [0003] We have applied for a national invention patent, patent number ZL200610029825.1, on the basis of studyin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D11/00
Inventor 王丽莲石江龙郭健沈正元
Owner 上海市机械制造工艺研究所有限公司
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