Preparation method of low-titanium low-nitrogen high-carbon chromium bearing steel

By modifying converter final slag and ladle top slag and optimizing LF refining slag, the Ti and N content in high carbon chromium bearing steel was controlled, solving the problem of fatigue performance degradation caused by TiN inclusions, and achieving high-cleanliness and low-cost bearing steel production.

CN123027504APending Publication Date: 2026-11-03UNIV OF SCI & TECH BEIJING +1
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Patent Information

Application Number
CN202611497908.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-09-24
Publication Date
2026-11-03

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively control TiN inclusions in high-carbon chromium bearing steel, leading to decreased fatigue performance. Furthermore, methods for controlling Ti and N content suffer from problems such as complex processes, high costs, and narrow operating windows.

Method used

By employing methods such as converter final slag pre-modification, ladle top slag secondary modification, staged alloying, and LF refining slag functional optimization, a cerium-strontium composite slag modifier composed of Ce2O3, SrO, CaO, and SiO2 is used to regulate the TiOx and N content during the converter and LF refining processes, forming a continuous control path and reducing the migration of TiOx and N into the molten steel.

Benefits of technology

It achieves synergistic control of Ti and N content, reduces the number and size of TiN inclusions, improves the fatigue resistance and cleanliness of bearing steel, reduces production costs, and has economic and market competitive advantages.

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Abstract

The application provides a preparation method of low-titanium low-nitrogen high-carbon chromium bearing steel and relates to the metallurgy field. The low-titanium low-nitrogen high-carbon chromium bearing steel comprises the following components: C 0.95-1.05%, Si 0.2-0.35%, Mn 0.25-0.40%, Cr 1.45-1.60%, Mo ≤0.04%, Ni ≤0.08%, P ≤0.020%, S ≤0.005%, Cu ≤0.15%, Ca ≤0.0003%, Alt ≤0.05%, Ti ≤0.0008%, T.O ≤0.0006%, and N ≤0.0025%. The preparation method forms a continuous control path of early stable solid titanium and promoting oxidation and titanium removal, middle stage of removing titanium-rich slag source, and late stage of inhibiting titanium return and increasing nitrogen by converter end slag pre-modification, ladle top slag secondary modification, phased alloying, titanium-rich oxide slag removal and LF refining slag function optimization, so that the low-titanium low-nitrogen high-carbon chromium bearing steel is obtained.
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Citation Information

Patent Citations

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