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Subzero treatment technology for improving wear resistance of alloy structural steel

An alloy structural steel and cryogenic treatment technology is applied in the field of cryogenic treatment for improving the wear resistance of alloy structural steel parts, achieving the effects of low cooling rate, avoiding thermal shock and brittle fracture, and improving wear resistance

Inactive Publication Date: 2017-03-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, alloy structural steel parts are not subjected to cryogenic treatment after quenching

Method used

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  • Subzero treatment technology for improving wear resistance of alloy structural steel
  • Subzero treatment technology for improving wear resistance of alloy structural steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: 40Cr cryogenic treatment process

[0021] A cryogenic treatment process for improving the wear resistance of structural steel, comprising the steps of:

[0022] (1) Put the 40Cr workpiece into the quenching furnace, heat it to 850°C, keep it warm for 60-100 minutes, then oil quench it, and cool it to room temperature;

[0023] (2) Put the quenched workpiece into the cryogenic box, close the box door, set the cooling rate to 2~4 ℃ / min, and the holding temperature to -80℃~-160℃, then open the liquid nitrogen valve to set The cooling speed makes the room temperature drop from -80°C to -160°C in the cryogenic box, and then keep it warm for 1 to 2 hours;

[0024] (3) Close the liquid nitrogen valve, cut off the power supply, take out the workpiece and place it in the air to return to room temperature naturally;

[0025] (4) Then put the workpiece into the cryogenic box again, and repeat the operations of (2) and (3) once;

[0026] (5) After the workpiece has un...

Embodiment 2

[0029] Embodiment two: cryogenic treatment process of 40MnB

[0030] A cryogenic treatment process for improving the wear resistance of structural steel, comprising the steps of:

[0031] (1) Put the 40MnB workpiece into the quenching furnace, heat it to 850°C, keep it warm for 60~100 minutes, then oil quench it, and cool it to room temperature;

[0032] (2) Put the quenched workpiece into the cryogenic box, close the box door, set the cooling rate to 2~4 ℃ / min, and the holding temperature to -80℃~-160℃, then open the liquid nitrogen valve to set The cooling speed makes the room temperature drop from -80°C to -160°C in the cryogenic box, and then keep it warm for 1 to 2 hours;

[0033] (3) Close the liquid nitrogen valve, cut off the power supply, take out the workpiece and place it in the air to return to room temperature naturally;

[0034] (4) Then put the workpiece into the cryogenic box again, and repeat the operations of (2) and (3) once;

[0035] (5) After the workpi...

Embodiment 3

[0036] Embodiment three: the cryogenic treatment process of 42CrMo

[0037] A cryogenic treatment process for improving the wear resistance of structural steel, comprising the steps of:

[0038] (1) Put the 42CrMo workpiece into the quenching furnace, heat it to 860°C, keep it warm for 60-100 minutes, then oil quench it, and cool it to room temperature;

[0039] (2) Put the quenched workpiece into the cryogenic box, close the box door, set the cooling rate to 2~4 ℃ / min, and the holding temperature to -80℃~-160℃, then open the liquid nitrogen valve to set The cooling speed makes the room temperature drop from -80°C to -160°C in the cryogenic box, and then keep it warm for 1 to 2 hours;

[0040] (3) Close the liquid nitrogen valve, cut off the power supply, take out the workpiece and place it in the air to return to room temperature naturally;

[0041] (4) Then put the workpiece into the cryogenic box again, and repeat the operations of (2) and (3) once;

[0042] (5) After th...

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Abstract

The invention discloses a subzero treatment technology for improving the wear resistance of alloy structural steel. The subzero treatment technology comprises the following steps: placing a quenched alloy structural steel workpiece in a subzero box, carrying out cooling in a liquid nitrogen vaporization latent heat and low-temperature nitrogen gas refrigeration manner, lowering the temperature to 80-160DEG C at a cooling speed of 2-4DEG C per minute, and keeping the temperature for 1-2 hours; then, taking the workpiece out of the subzero box, and naturally raising the temperature to a room temperature in air; and after repeating the operation, carrying out tempering treatment and finishing the technology. After the alloy structural steel is treated by the method of the invention, the wear quantity of the material is obviously reduced, and the wear resistance is obviously improved.

Description

technical field [0001] The invention relates to the technical field of cryogenic treatment of alloy structural steel, in particular to a cryogenic treatment process for improving the wear resistance of alloy structural steel parts. Background technique [0002] Alloy structural steel is widely used in parts such as gears, shafts, crankshafts, sleeves, etc. These parts need to have high wear resistance. At present, the methods to improve the wear resistance of alloy structural steel are mainly high-frequency surface quenching and nitriding treatment. In the prior art, the alloy structural steel parts are not subjected to cryogenic treatment after quenching. As a continuation of ordinary heat treatment, cryogenic treatment can improve the microstructure of alloy structural steel, thereby improving the wear resistance of alloy structural steel. Therefore, study the cryogenic treatment process of alloy structural steel to improve its wear resistance, reduce its wear and tear d...

Claims

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Application Information

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IPC IPC(8): C21D6/04C21D1/18
CPCC21D6/04C21D1/18
Inventor 刘旺玉骆涛谢镇鸿谢凡
Owner SOUTH CHINA UNIV OF TECH
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