High homogenization bearing steel GCr15 continuous casting billet and preparation method thereof

By employing a fully integrated and controlled preparation method, the problems of compositional segregation and uneven microstructure in GCr15 bearing steel continuous casting billets were solved, achieving high homogeneity, improving the fatigue performance and wear resistance of bearing steel, and meeting the quality requirements of high-end bearings.

CN122081771APending Publication Date: 2026-05-26JIANLONG BEIMAN SPECIAL STEEL CO LTD
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Patent Information

Application Number
CN202610362095.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-24
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing continuous casting billet preparation technology for GCr15 bearing steel has failed to effectively solve the problems of compositional segregation, uneven microstructure and internal defects, resulting in decreased fatigue performance and wear performance, failure to achieve high homogeneity, and impact on bearing service life and quality.

Method used

The preparation method adopts a whole-process collaborative control approach, including strict control of raw material composition and temperature, precise connection of steelmaking, refining and continuous casting processes, and the use of technologies such as electromagnetic stirring and light reduction to ensure the uniformity of steel composition and the stability of solidification structure, thus constructing a whole-process homogenization control system.

Benefits of technology

It achieves high homogeneity of bearing steel continuous casting billets, significantly improves internal quality uniformity and performance consistency, eliminates defects such as center segregation, porosity and shrinkage cavities, and meets the requirements of high-end bearing steel.

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Abstract

This invention relates to a high-homogeneity bearing steel GCr15 continuous casting billet and its preparation method, belonging to the technical field of bearing steel continuous casting billet preparation. To address the problems of compositional segregation, uneven microstructure, and internal defects in high-end bearing steel continuous casting billets, this invention provides a high-homogeneity bearing steel GCr15 continuous casting billet and its preparation method, including the coordinated control of raw material preparation, converter smelting, refining, and continuous casting. This invention strictly controls the chemical composition of bearing steel from the source, eliminates the risk of raw material segregation at its root, precisely connects the refining-continuous casting temperature, coordinates the time nodes of each process, ensures constant pouring temperature and billet pulling speed, avoids time and temperature discrepancies, effectively improves the solidification structure, and reduces segregation and porosity. By constructing a full-process homogenization control system, the center segregation index of the continuous casting billet is ≤1.05, the center porosity level is ≤1, and the shrinkage cavity level is ≤0.5, significantly improving the uniformity and consistency of the product and meeting the requirements of high-end bearing steel.
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