A short flow production method of superplastic thin strip steel and superplastic thin strip steel

By optimizing the thin strip continuous casting technology and online hot rolling process, superplastic thin strip steel with low carbon and low alloy content was prepared, which solved the problems of complex and high cost in the production of advanced high-strength steel, achieved a combination of high strength and high elongation, and simplified the production process.

CN116511435BActive Publication Date: 2026-06-26CENT SOUTH UNIV +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CENT SOUTH UNIV
Filing Date
2023-03-20
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

The existing advanced high-strength steel production process is complex and costly, making it difficult to further improve the strength-ductility product. Moreover, the existing steel grades have insufficient elongation at high tensile strength.

Method used

Using thin strip continuous casting technology, molten steel is cast through a twin-roll thin strip continuous casting machine, combined with online hot rolling and cooling control, to produce superplastic thin strip steel with low carbon and low alloy content. This process includes natural air cooling, online hot rolling, rapid cooling and coiling, and optimization of steel composition such as the content of C, Si and Mn.

Benefits of technology

It achieves a combination of low-cost production of high strength and high elongation, simplifies the production process, reduces production costs, and provides a research and development direction for a new generation of thin-gauge hot-rolled ultra-high-strength automotive steel sheets.

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Abstract

The application belongs to the technical field of steel metallurgical material, and relates to a short-flow production method of superplastic thin strip steel and the superplastic thin strip steel. Molten steel is cast into a thin strip with a thickness of 2-5 mm by a double-roller thin strip continuous casting machine; the thin strip is naturally air-cooled to 950-1050 DEG C after leaving the crystallization roller, and then hot-rolled at a temperature of 850-950 DEG C with a reduction of 20-50%. The hot-rolled steel strip is cooled at a cooling speed of not less than 50 DEG C / s. The cooled thin strip is coiled at a temperature of 300-350 DEG C, and immediately water-cooled after coiling to obtain a finished steel coil. The yield strength of the final thin strip steel is 700-865 MPa, the tensile strength is 1024-1078 MPa, the elongation after fracture is 30-36%, and the product of strength and plasticity is 31-39 GPa%. The application realizes the super-high plasticity high-strength steel in a super-short flow and super-low cost mode. The process route of the application is short, efficient and low in cost, and is convenient for the industrialization and industrial application of advanced high-strength steel.
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