Quench cooling process for H13 steel

A cooling process and workpiece technology, applied in the direction of quenching agent, manufacturing tools, heat treatment equipment, etc., can solve problems such as cracking and deformation, and achieve the effect of slowing down cooling speed, reducing tissue stress, and not deep cracking

Active Publication Date: 2014-07-09
GUANGZHOU DIE & MOLD MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the above-mentioned technical problems, the object of the present invention is to provide a quenching and cooling process for H13 steels, through which the cracking and deformation of H13 steel quenching devices can be avoided, and a good martensitic structure can be obtained

Method used

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  • Quench cooling process for H13 steel

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Experimental program
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Effect test

Embodiment 1

[0028] The gas quenching furnace adopts a vacuum pressure gas quenching furnace, which is evacuated to a pressure of 0.08Pa in the furnace, and then filled with N with a pressure of 100Pa. 2 Carry out protection; heat up at a heating rate of 15°C / min, and keep warm for 200 minutes when the furnace temperature reaches 650°C; then continue heating at a heating rate of 13°C / min, and keep warm for 140 minutes when it reaches 850°C; Heating at a heating rate of 13°C / min, keeping warm at 1050°C for 135min; filling the vacuum high-pressure gas quenching furnace with N 2 , the workpiece is cooled to a surface temperature of 680 °C; the workpiece is taken out and quenched into a 50% sodium hydroxide aqueous solution and cooled to a surface temperature of 370 °C; the workpiece is taken out of the aqueous solution and isothermal until the difference between the core temperature and the surface temperature of the workpiece The temperature is less than 90°C, and then the workpiece is air-c...

Embodiment 2

[0030] The gas quenching furnace adopts a vacuum pressure gas quenching furnace, which is evacuated to a pressure of 0.08Pa in the furnace, and then filled with N with a pressure of 100Pa. 2 Carry out protection; heat up at a heating rate of 15°C / min, and keep warm for 200 minutes when the furnace temperature reaches 650°C; then continue heating at a heating rate of 13°C / min, and keep warm for 140 minutes when it reaches 850°C; Heating at a heating rate of 13°C / min, keeping warm at 1050°C for 135min; filling the vacuum high-pressure gas quenching furnace with N 2 , the workpiece is cooled to a surface temperature of 720°C; the workpiece is taken out and quenched into a 50% sodium hydroxide aqueous solution and cooled to a surface temperature of 410°C; the workpiece is taken out of the aqueous solution and isothermal until the difference between the core temperature and the surface temperature of the workpiece The temperature is less than 90°C, and then the workpiece is air-coo...

Embodiment 3

[0032] The gas quenching furnace adopts a vacuum pressure gas quenching furnace, which is evacuated to a pressure of 0.08Pa in the furnace, and then filled with N with a pressure of 100Pa. 2 Carry out protection; heat up at a heating rate of 15°C / min, and keep warm when the furnace temperature reaches 650°C for 200 minutes; then continue heating at a heating rate of 13°C / min, and keep warm when it reaches 850°C for 140 minutes; Heating at a heating rate of 13°C / min, keeping warm at 1050°C for 135min; filling the vacuum high-pressure gas quenching furnace with N 2 , the workpiece is cooled to a surface temperature of 700°C; the workpiece is taken out and quenched into a 50% sodium hydroxide aqueous solution and cooled to a surface temperature of 390°C; the workpiece is taken out of the aqueous solution and isothermal until the difference between the core temperature and the surface temperature of the workpiece The temperature is less than 90°C, and then the workpiece is air-coo...

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Abstract

The invention relates to a quench cooling process for H13 steel. The process sequentially comprises a grading heating step, a gas cooling step, a water cooling step and an air cooling step. During quench cooling in the invention, gas cooling, water cooling and air cooling occur in order. Water cooling speeds up the cooling rate of quenching, so that austenite is rapidly supercooled to a martensite region, thus ensuring a martensitic structure obtained during quenching. The air cooling after water cooling greatly slows down the cooling rate, therefore, the structural stress generated when the austenite structure transforms into the martensitic structure is reduced, thus guaranteeing that a workpiece does not crack and a deeper hardening layer can be obtained. The process provided in the invention is suitable for quench cooling of H13 steel.

Description

technical field [0001] The invention relates to a steel quenching process, in particular to a quenching and cooling process for H13 steel. Background technique [0002] Die-casting molds generally use H13 steel with better hardenability. The more commonly used quenching methods are water quenching and oil quenching, but for H13 steel with better hardenability, water quenching is not suitable for the whole process, because water has a strong cooling ability, direct quenching, in the martensitic transformation temperature zone If the cooling rate is too high, the internal stress will increase sharply due to the dual effects of tissue stress and thermal stress, causing serious deformation or even cracking of the parts; it is also not suitable to use oil quenching, because the cooling rate of oil quenching is small, the hardening diameter is small, and large workpieces Not easy to harden. [0003] At present, there is no simple and convenient quenching and cooling process that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/19C21D1/613C21D1/60
Inventor 马广兴肖伟雄叶能
Owner GUANGZHOU DIE & MOLD MFG
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