Guide arm spring flat steel surface crack control process method

By optimizing the entire process to control surface cracks in guide arm spring flat steel, the problem of high incidence of surface cracks in guide arm spring flat steel has been solved, achieving high pass rate and low-cost production, and ensuring product safety and reliability.

CN121104043APending Publication Date: 2025-12-12HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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Patent Information

Application Number
CN202511511136.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-22
Publication Date
2025-12-12

AI Technical Summary

Technical Problem

In existing production processes, the surface cracking rate of guide arm spring flat steel is high, affecting product quality and safety. Furthermore, traditional processes lack sufficient coordinated control of multiple stages, resulting in poor parameter matching and delayed quality inspection feedback.

Method used

A process optimization approach is adopted, including smelting, continuous casting, rolling, and quality inspection. By optimizing smelting processes (such as converter smelting control, LF furnace refining, and vacuum treatment), continuous casting processes (such as crystallizer parameter optimization and protective slag selection), and rolling processes (such as heating control and descaling control), combined with online and offline detection, a closed-loop control is formed to dynamically adjust process parameters to reduce crack initiation.

Benefits of technology

It significantly reduces the gas and inclusion content in steel, reduces surface cracks in billets and finished products, increases the product qualification rate to over 95%, reduces scrap rate and production costs, and ensures the production of high-reliability guide arm spring flat steel.

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Abstract

The invention relates to the technical field of guide arm spring flat steel, and discloses a guide arm spring flat steel surface crack control technological method.The guide arm spring flat steel surface crack control technological method comprises the following technological methods of S1, smelting technology optimization, S2, continuous casting technology control, S3, rolling technology optimization and S4, quality detection and feedback adjustment. In the smelting stage, through slag stopping and tapping, LF furnace long-time refining white slag making (the alkalinity is 5.0-7.0, and the white slag retention time is longer than or equal to 30 min) and vacuum deep degassing (the vacuum degree is smaller than or equal to 67 Pa, and the retention time is longer than or equal to 15 min), the content of gas (the hydrogen content is smaller than or equal to 1.5 ppm) and the content of inclusions in steel are remarkably reduced, component fluctuation in the later period is avoided through accurate use of a diffusion deoxidizing agent (the use amount is larger than or equal to 80 kg / furnace), a pure molten steel foundation is laid for the follow-up process, and the production cost is reduced. And crack inducements caused by inclusion and gas are reduced from the source.
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