A low-cost and high-cleanliness bearing steel production process capable of realizing multi-furnace continuous casting

By comprehensively adopting processes that strictly control the Ti content of raw materials, efficient P-de-P-de-Ti, double-slag-retaining carbon-keeping smelting technology, continuous casting and casting reuse technology, weak slag surface deoxidation technology and different steel grade docking technology, the problems of multi-furnace continuous pouring and high cleanliness production of bearing steel are solved, and efficient and low-cost bearing steel production is achieved.

CN119753260APending Publication Date: 2025-04-04JIANGSU CHANGQIANG IRON & STEEL CO LTD
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Patent Information

Application Number
CN202411965469.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

The prior art is difficult to achieve continuous pouring of bearing steel for multiple furnaces, resulting in low production efficiency and high cost. Due to the prohibition of calcium treatment, Al2O3 inclusions are prone to stick to the water outlet during casting, causing blockage.

Method used

Comprehensive processes including strict control of the Ti content of raw materials, high-efficiency de-P of the converter, double slag removal and carbon-keeping smelting technology, continuous casting and casting reuse process, weak slag surface de-oxidation process and different steel type docking technology are adopted to ensure the low oxygen, low titanium and high purity characteristics of bearing steel.

Benefits of technology

The continuous pouring of bearing steel 18-20 furnaces has been achieved, which reduces production costs, improves production efficiency, and meets the requirements of low oxygen, low titanium and high purity of high-quality steel standards.

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Abstract

The present invention discloses a low-cost high-cleanliness bearing steel production process capable of realizing multi-furnace continuous casting, 1) in the converter smelting process, the converter high-efficiency P and Ti removal double slag carbon preservation smelting process is adopted; 2) in the steel tapping deoxidation alloying process, the continuous casting waste recycling process is adopted; 3) in the LF refining process, the segmented slag surface weak diffusion deoxidation process is adopted; 4) in the continuous casting molding process, the square billet different steel grade continuous casting process is adopted, and the bearing steel production casting requires the first several furnaces to cast other high-quality carbon steel or alloy structural steel that needs to be treated with calcium, so that the tundish can be thoroughly preheated. The present invention improves the production of bearing steel in an all-round way, so that the continuous casting of 18-20 furnaces of bearing steel can be realized, and the products obtained meet the standard requirements of high-grade high-quality steel with low oxygen, low titanium and high purity, saving costs in many aspects.
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