High temperature carburizing and double quenching process method for heavy load gear steel

By employing a double quenching process following high-temperature carburizing, the problems of long carburizing cycles, high costs, and grain coarsening in heavy-duty gears have been solved, achieving efficient and low-cost improvement in microstructure and properties.

CN117758199BActive 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 carburizing process for heavy-duty gears has problems such as long cycle time, high cost, low efficiency and high energy consumption. Moreover, the original austenite grains coarsen after high-temperature carburizing, resulting in a decline in overall performance.

Method used

A double quenching process is adopted after high-temperature carburizing, including two high-temperature tempering and deep cryogenic treatment. This process refines the austenite grains and induces the transformation of twinned martensite into dislocation martensite, thereby improving the overall microstructure properties.

Benefits of technology

It significantly shortens the carburizing cycle, reduces energy consumption, improves tensile strength and elongation, reduces raw material costs, and simplifies the process.

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Abstract

The present application belongs to the field of metal materials, and particularly relates to a high-temperature carburizing double quenching process method for heavy-load gear steel. In order to solve the problems of long cycle, low efficiency and high cost of heavy-load gear with large carburized layer in the conventional carburizing process, and the problems of grain coarsening and poor comprehensive performance in the high-temperature carburizing process, the present application can shorten the carburizing cycle and save energy consumption by increasing the carburizing temperature to accelerate the diffusion rate of carbon atoms. At the same time, the present application can refine the original austenite grains and improve the comprehensive performance of the structure through the double quenching process, thereby avoiding the problems of high cost of micro-alloying of raw materials and complicated pre-carburizing + re-carburizing process in the prior art.
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Citation Information

Patent Citations

  • CN109082628B

  • CN109321739A

  • CN113430461A

  • CN110564922A

  • CN116574883A