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Heat treatment method for 20CrNi2Mo steel used in heavy-duty gears

A heat treatment method and gear technology, applied in the direction of solid-state diffusion coating, coating, metal material coating process, etc., can solve the problem of low heat treatment deformation performance, and achieve the effects of simple production process, improved performance, and accelerated production cycle

Inactive Publication Date: 2012-02-29
HUAIYIN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

[0003] The purpose of the present invention is to: conduct research on the problems of heat treatment deformation and low performance of 20CrNi2Mo steel for heavy-duty gears, provide a heat treatment method for 20CrNi2Mo steel for heavy-duty gears, improve the performance of 20CrNi2Mo steel through this heat treatment method, and reduce heat treatment deformation To lay the foundation for expanding the application of 20CrNi2Mo steel in actual production

Method used

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Embodiment Construction

[0008] The heat treatment of 20CrNi2Mo steel for heavy-duty gears is as follows: First, 20CrNi2Mo steel is normalized at 930 °C for 4 hours in a high-temperature resistance furnace; after that, it is carburized at 930 °C for 10 hours in a carburizing furnace; 830°C, 3h oil medium quenching treatment in the furnace; finally, 180°C, 8h tempering treatment in the heating furnace.

[0009] Listed in table 1 is the performance comparison of the 20CrNi2Mo steel sample after using the heat treatment method of the present invention and the common traditional process mentioned in the technical background. Properties of 20CrNi2Mo steel.

[0010] Table 1 Performance experimental data of 20CrNi2Mo steel samples before and after heat treatment

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Abstract

The invention discloses a heat treatment method for 20CrNi2Mo steel used in heavy-duty gears. The invention belongs to the technical field of metal material heat treatment. According to the invention, first, 20CrNi2Mo steel is processed through a normalization treatment under a temperature of 930 DEG C for 4 hours; the 20CrNi2Mo steel is processed through a carburization treatment under a temperature of 930 DEG C for 10 hours; then the 20CrNi2Mo steel is processed through an oil medium quenching treatment under a temperature of 830 DEG C for 3 hours; and finally the 20CrNi2Mo steel is processed through a tempering treatment under a temperature of 180 DEG C for 8 hours. According to the invention, a novel heat treatment method is adopted upon the 20CrNi2Mo steel used in heavy-duty gears. With the heat treatment method, performances of the 20CrNi2Mo steel used in heavy-duty gears are good, and deflection can be effectively reduced. Therefore, a basis is established for the expanding of the application field of the 20CrNi2Mo steel.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and relates to a heat treatment method for 20CrNi2Mo steel for heavy-duty gears, which is applicable to the field of 20CrNi2Mo steel for high-performance heavy-duty gears required by industries such as coal mines and engineering machinery. Background technique [0002] 20CrNi2Mo steel is a new type of carburized gear steel with high content of alloy elements. After heat treatment, it has excellent comprehensive mechanical properties and wear resistance, and is widely used in heavy-duty gears, carburized bearings and agricultural machinery wear parts. And other parts that require wear resistance and impact resistance. When used to manufacture heavy-duty gears, since heavy-duty gears transmit large power and bear relatively large loads, there are many problems and defects in practical applications. In addition, the heat treatment process of the existing 20CrNi2Mo steel is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C21D1/18C21D1/28C23C8/22
Inventor 刘爱辉隋艳伟周广宏丁红燕
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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