Large module die steel quenching method

A die steel, large-scale technology, applied in the field of heat treatment, can solve the problems of easy cracking in water quenching, impenetrable oil quenching, high cooling intensity in water quenching and easy cracking, etc., to avoid cracking, reduce quenching stress, and eliminate surface structure transformation stress Effect

Inactive Publication Date: 2019-01-08
武钢集团襄阳重型装备材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the problems existing in the background technology, the purpose of the present invention is to provide a method to solve the problems that the large-scale module of 1.2738 die steel cannot be quenched

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The method for quenching large-scale modular die steel designed by the present invention, the steps are as follows:

[0015] 1. Heat the workpiece to 870°C±10°C and keep it warm for 8 hours;

[0016] 2. Water cooling for 42 minutes for the first time, control the core temperature at 500°C, air cooling for 3 minutes, and return to 350°C;

[0017] 3. Water cooling for 15 minutes for the second time, control the core temperature at 400°C, air cooling for 2 minutes, and return to 300°C;

[0018] 4. Water cooling for 10 minutes for the third time, control the core temperature at 300°C, air cooling for 2 minutes, and return to 260°C;

[0019] 5. Water cooling for 8 minutes for the fourth time, control the core temperature at 250°C, air cooling for 2 minutes, and return to 230°C;

Embodiment 2

[0021] The method for quenching large-scale modular die steel designed by the present invention, the steps are as follows:

[0022] 1. Heat the workpiece to 870°C±10°C and keep it warm for 8.5 hours;

[0023] 2. Water cooling for 46 minutes for the first time, control the core temperature at 500°C, air cooling for 3 minutes, and return to 350°C;

[0024] 3. Water cooling for 12 minutes for the second time, control the core temperature to 400°C, air cool for 2 minutes, and return to 300°C;

[0025] 4. Water cooling for 12 minutes for the third time, control the core temperature at 300°C, air cooling for 2 minutes, and return to 260°C;

[0026] 5. Water cooling for 10 minutes for the fourth time, control the core temperature at 250°C, air cooling for 2 minutes, and return to 230°C;

Embodiment 3

[0028] The method for quenching large-scale modular die steel designed by the present invention, the steps are as follows:

[0029] 1. Heat the workpiece to 870°C±10°C and keep it warm for 9 hours;

[0030] 2. Water cooling for 48 minutes for the first time, control the core temperature at 500°C, air cooling for 3 minutes, and return to 350°C;

[0031] 3. The second water cooling for 13 minutes, control the core temperature of 400 ℃, air cooling for 2 minutes, and return to 300 ℃;

[0032] 4. Water cooling for 11 minutes for the third time, control the core temperature to 300°C, air cooling for 2 minutes, and return to 260°C;

[0033] 5. Water cooling for 9 minutes for the fourth time, control the core temperature at 250°C, air cooling for 2 minutes, and return to 230°C;

[0034] Preferably, the rewarming temperature is the surface temperature of the large module mold to be treated.

[0035] Preferably, the water cooling adopts fully immersing the large module mold to be pr...

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PUM

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Abstract

The invention designs a large module die steel quenching method. The large module die steel quenching method is characterized by comprising the following steps: heating large module die steel to be treated to a temperature in an austenite temperature section and insulating for 8-9 hours; carrying out water cooling and controlling the temperature of a core, hoisting out the large module die steel to be treated, and carrying out air cooling and self-tempering; and after carrying out water cooling and air cooling repeatedly for four times, enabling the temperature of the core of the large moduledie to be treated to reach the temperature at which martensite begins to be transformed and then completing quenching. The cooling intensity of the large module die steel quenching method is between the cooling intensity of oil quenching and the cooling intensity of water quenching, and water quenching cracking is avoided while it ensures that large modules are quenched thoroughly. Repeated waterlifting is carried out to reduce cooling speed, quenching stress is reduced, and quenching cracking is also prevented while the cooling speed of a high-temperature section is increased. Structural stress can be greatly reduced, and cracking of a low-temperature section is avoided.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to a quenching method for 1.2738 large modular mold steel. Background technique [0002] 1.2738 mold steel is a material used to make large-scale plastic molds, and has very strict requirements on hardness uniformity. The quenching and tempering heat treatment process of this material generally includes: heating, heat preservation, quenching, high temperature tempering and other steps. The following problems are prone to occur during the quenching and tempering process: 1. Uneven hardness; 2. Quenching is easy to crack; 3. The comprehensive mechanical properties are unqualified . Usually for small 1.2738 forgings, oil quenching can generally be used to improve material properties. As a large module of 1.2738, if the traditional oil quenching is used, it will not be quenched through, the hardness difference between the core and the surface is large, and even the ...

Claims

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Application Information

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IPC IPC(8): C21D1/18
CPCC21D1/18
Inventor 何建武潘宗
Owner 武钢集团襄阳重型装备材料有限公司
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