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Heat treatment process of high-wear-resistance antirust gear steel

A high wear resistance, gear steel technology, applied in heat treatment furnaces, hot dip plating processes, heat treatment equipment, etc., can solve the problems of uneven heat dissipation, low structural integration, affecting the service life of gear steel, etc.

Inactive Publication Date: 2020-08-18
ZHANGJIAGANG CITY GUANGDA MACHINERY FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Banded structure is a structural defect of steel. For gear steel, severe banded structure will affect the uniformity of carburization, increase the degree of quenching deformation, low degree of structural integration, uneven heat dissipation, and greatly reduce its wear resistance , affecting the service life of gear steel

Method used

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  • Heat treatment process of high-wear-resistance antirust gear steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The invention provides a high wear resistance antirust gear steel heat treatment process, the specific operation steps are:

[0032] Step 1: Use medium alloy steel raw material 30Mn 2 MoW hot die forging gear blanks, pre-heating the gear blanks, performing sub-temperature secondary normalizing to refine the structure, and periodically supplying oxygen to the normalizing furnace at a uniform speed when the gear blanks are heated by the secondary normalizing, And fully pyrolysis combustion dehydrogenation, sub-temperature secondary normalizing process are as follows:

[0033] The first normalizing heating temperature is 930°C, after heating for 30 minutes, keep warm for 20 minutes, and air cool to 500°C;

[0034] The second normalizing heating temperature is 870°C. After heating for 30 minutes, keep it warm for 20 minutes, and then take it out of the oven and air cool to room temperature;

[0035] Excellent strength and toughness are obtained through sub-temperature sec...

Embodiment 2

[0053] The invention provides a high wear resistance antirust gear steel heat treatment process, the specific operation steps are:

[0054] Step 1: Use medium alloy steel raw material 30Mn 2 MoW hot die forging gear blanks, pre-heating the gear blanks, performing sub-temperature secondary normalizing to refine the structure, and periodically supplying oxygen to the normalizing furnace at a uniform speed when the gear blanks are heated by the secondary normalizing, And fully pyrolysis combustion dehydrogenation, sub-temperature secondary normalizing process are as follows:

[0055] The first normalizing heating temperature is 950°C, after heating for 30 minutes, keep warm for 20 minutes, and air cool to 500°C;

[0056] The second normalizing heating temperature is 900°C. After heating for 30 minutes, keep it warm for 20 minutes, and then take it out of the oven and air cool to room temperature;

[0057] Excellent strength and toughness are obtained through sub-temperature sec...

Embodiment 3

[0075] The invention provides a high wear resistance antirust gear steel heat treatment process, the specific operation steps are:

[0076] Step 1: Use medium alloy steel raw material 30Mn 2 MoW hot die forging gear blanks, pre-heating the gear blanks, performing sub-temperature secondary normalizing to refine the structure, and periodically supplying oxygen to the normalizing furnace at a uniform speed when the gear blanks are heated by the secondary normalizing, And fully pyrolysis combustion dehydrogenation, sub-temperature secondary normalizing process are as follows:

[0077] The first normalizing heating temperature is 980°C, after heating for 30 minutes, keep warm for 20 minutes, and air cool to 500°C;

[0078] The second normalizing heating temperature is 920°C. After heating for 30 minutes, keep it warm for 20 minutes, and then take it out of the oven and air cool it to room temperature;

[0079] Excellent strength and toughness are obtained through sub-temperature ...

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Abstract

The invention discloses a heat treatment process of high-wear-resistance antirust gear steel. The heat treatment process comprises the following steps of carrying out hot die forging on a gear blank by using a medium alloy steel raw material; carrying out heating pretreatment on the gear blank; carrying out sub-temperature secondary normalizing; refining a tissue structure; periodically supplyingoxygen into a normalizing furnace at a constant speed during secondary normalizing heating of the gear blank; and carrying out sufficient pyrolysis combustion dehydrogenation. According to the heat treatment process, crystalline grains of the gear blank are refined through sub-temperature secondary normalizing, so that the cracking tendency of a steel part is reduced; the oxygen is supplied for sufficient pyrolysis combustion dehydrogenation, so that the hydrogen embrittlement phenomenon is reduced; the structure is uniformly strengthened through quenching and tempering treatment, so that theinternal structure is uniform and compact, the heat conduction and dissipation performance is improved, and steel structure layering is avoided; dirt on the surface of steel is removed through shot blasting treatment, so that the bonding strength between a workpiece and a protective coating is improved, the wear-resisting and rust-preventing effects are achieved through cooperation with a hot galvanizing layer, and the surface organization structure of the rough gear is strengthened; and overall carburizing and outer side quenching layer carbonitriding are combined, so that the overall performance of the gear steel is improved.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing, in particular to a high wear resistance rust-proof gear steel heat treatment process. Background technique [0002] Gear steel is one of the key materials with high requirements in the special alloy steel used in automobiles, railways, ships, and construction machinery, and is a manufacturing material for core components that ensure safety. Gear steel is developing in the direction of high performance, long life, smooth gear operation, low noise, safety, low cost, easy processing, and multiple varieties. Grain size is an important indicator of gear steel. The fine and uniform austenite grains in the gear steel form a fine martensite structure after quenching, which can significantly improve the fatigue performance of the gear and reduce the deformation of the gear after heat treatment. [0003] Meticulous microstructure can improve the hardness and toughness of steel, but bande...

Claims

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Application Information

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IPC IPC(8): C21D1/28C21D3/06C21D1/25C21D1/06C21D7/06C21D9/32C23C2/06C23C2/34C23C8/32
CPCC21D1/06C21D1/25C21D1/28C21D3/06C21D7/06C21D9/32C23C2/06C23C2/34C23C8/32
Inventor 于广文周青春罗晓芳徐卫明顾金才
Owner ZHANGJIAGANG CITY GUANGDA MACHINERY FORGING
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