A method for quality control of 200 square meter spring steel continuous casting billet

By adopting a complete process of converter-LF refining-RH vacuum-continuous casting, the problems of lack of coordination of multiple process parameters and insufficient tooling precision in the quality control of 200 cubic meter spring steel continuous casting billets have been solved, and the internal density and surface quality of the billets have been improved, making them suitable for high-stress service scenarios.

CN122441908APending Publication Date: 2026-07-24JIANLONG BEIMAN SPECIAL STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANLONG BEIMAN SPECIAL STEEL CO LTD
Filing Date
2026-06-22
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In the existing technology, the quality control of 200 cubic meter spring steel continuous casting billets has problems such as lack of coordination among multiple process parameters, insufficient tooling precision, and difficulty in achieving coordinated standards for the internal and surface quality of the billet. In particular, there are significant defects in terms of central shrinkage cavities, segregation, and subcutaneous cracks.

Method used

The process adopts a complete process of converter-LF refining-RH vacuum-continuous casting. Through refined parameter matching and process collaborative design, including raw material control, smelting, refining, vacuum treatment and continuous casting equipment control, combined with low superheat casting, electromagnetic stirring, segmented cooling and light reduction technology, the accuracy of the crystallizer water gap and the water distribution in the secondary cooling zone are optimized to ensure the purity of molten steel and the uniformity of the billet.

Benefits of technology

It significantly reduces central shrinkage and segregation, improves the internal density and surface quality of the billet, and ensures the high quality of the billet, making it suitable for high-stress service scenarios such as automotive suspension and rail transportation.

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Abstract

The present application relates to a kind of 200 square spring steel continuous casting billet quality control method, belong to steel metallurgy technical field.To solve the problem that existing 200 square spring steel continuous casting billet quality control lacks synergy in multiple process parameters, insufficient precision constraint, purity and continuous casting disconnection, the present application provides a kind of 200 square spring steel continuous casting billet quality control method, including raw material control, converter smelting, LF refining, RH vacuum treatment, continuous casting equipment control and continuous casting process control.The present application solves the problem of 200 square spring steel continuous casting billet center shrinkage hole, segregation and surface crack by whole-process multi-parameter coordinated control, systematically.The 200 square spring steel continuous casting billet produced by the method of the present application, center loose ≤1 level, shrinkage hole ≤0.5 level, segregation index is stably between 0.950~1.050, lay a solid organizational foundation for high-quality spring steel wire subsequent rolling and heat treatment, with significant economic benefits and application prospect.
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