High temperature carburizing process for different media quenched gear steels

By optimizing the high-temperature carburizing process using different quenching media, the problem of excessively high hardness and poor toughness in the center of the high-temperature carburizing process for heavy-duty gear steel was solved. This resulted in improved core toughness and maintained surface hardness, thus improving the overall performance of heavy-duty gears.

CN117758198BActive Publication Date: 2026-07-24CHANGSHU TIANDI COAL MINING EQUIP CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGSHU TIANDI COAL MINING EQUIP CO LTD
Filing Date
2023-12-06
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The existing high-temperature carburizing process for heavy-duty gear steel has problems such as long process cycle, high energy consumption, high labor intensity, and high core hardness and poor toughness after quenching. Existing improvement methods have increased the complexity of the process and the cost of raw materials.

Method used

Different media quenching processes, including a combination of oil cooling and air cooling, were employed to reduce the martensite content in the core and increase the bainite content. The carburizing heat treatment process was optimized through finite element simulation to control grain growth and maintain the surface martensite structure.

Benefits of technology

Without increasing the process flow and cost, it significantly improves the toughness of the gear steel core, reduces the core hardness, and maintains high surface hardness, thus improving the overall performance.

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Abstract

The present application belongs to the field of metal materials, and particularly relates to a high-temperature carburizing process method of gear steel quenched by different media. The present application develops the carburizing process of gear alloy carburizing steel by finite element simulation mode, and proposes a double-medium quenching process to improve the phase organization of the core of the sample, reduce the martensite content of the core, increase the bainite content, thereby reduce the hardness of the core, and further improve the toughness of the core of the sample, on the basis of ensuring the control of production cost, without increasing the process flow and improving the use performance. The carburized surface is still martensite organization, and the high hardness of the surface layer is maintained.
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Citation Information

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