Tool for heat treatment of high-temperature carburizing bearing steel bearing ring and process method for reducing heat treatment deformation

CN121896433AInactive Publication Date: 2026-04-21上海皎燕科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
上海皎燕科技有限公司
Filing Date
2026-01-27
Publication Date
2026-04-21
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing heat treatment processes cannot effectively improve the high-temperature hardness retention, dimensional stability, and toughness of high-temperature bearing rings, resulting in loss of bearing preload, reduced rotational accuracy, and increased risk of failure.

Method used

By employing high-temperature austenitizing solution treatment, low-temperature pulsed carbonitriding, and sub-temperature quenching followed by double high-temperature tempering, combined with specific tooling design, a dense compound layer and a deep diffusion layer are formed, thus optimizing the microstructure.

Benefits of technology

It significantly improves the high-temperature hardness retention, dimensional stability, and toughness of bearing rings, reduces heat treatment deformation, and ensures long-term stability and rotational accuracy.

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Abstract

The invention discloses a tool for heat treatment of a high-temperature carburizing bearing steel bearing ring and a technological method for reducing heat treatment deformation, and relates to the field of heat treatment.The technological method comprises the following steps that S1, the bearing ring is subjected to solution treatment and then quenched; s2, the pretreated bearing ring is subjected to low-temperature pulse carbonitriding; and S3, the bearing ring obtained after co-permeation is completed is subjected to subcritical quenching and two times of high-temperature tempering. Aiming at a bearing ring of a high-temperature bearing steel base material, a low-temperature pulse carbonitriding process is adopted, a fine and continuous nitrogen-rich carbon compound layer and a diffusion layer with large depth can be formed, and compared with traditional carbonitriding, the low-temperature pulse carbonitriding process has the advantages that the temperature is high, a thick and brittle compound layer is easy to form, deformation is large, and the service life is long. According to the technology, the softening resistance of the bearing ring at the high temperature is enhanced, the deformation is controllable, microcracks are effectively inhibited, and therefore the dimensional stability of the bearing ring at the long-term service high temperature is improved.
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