High-strength pickled enamel steel is produced using a high-performance, uniform production method with a straight-through rolling process.

By optimizing the chemical composition and process route of high-strength pickled enamel steel, the problem of uneven product performance under the straight rolling mode was solved, achieving uniform performance and good anti-scaling properties of high-strength pickled enamel steel, and reducing production costs.

CN122128499APending Publication Date: 2026-06-02LIUZHOU IRON & STEEL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LIUZHOU IRON & STEEL
Filing Date
2026-03-17
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In the hot rolling process of high-strength pickled enamel steel, the problem of uneven product performance is difficult to solve when the straight rolling mode is used, especially when a hot coil box is not used, which affects the anti-scaling performance, post-furnace mechanical properties and cost economy.

Method used

By optimizing the chemical composition and process route of high-strength pickled enamel steel, including the speed control of the finishing mill stand, coiling temperature and cooling mode, the performance uniformity of the product is ensured under the straight rolling mode. The Ti microalloying composition system is adopted, combined with a reasonable rolling process, the finishing mill temperature and speed are controlled, and the back cooling mode is used to improve the grain uniformity of the steel coil.

Benefits of technology

The performance uniformity of high-strength pickled enamel steel under the straight rolling mode was achieved, with yield strength fluctuation range less than 50MPa, tensile strength fluctuation less than 30MPa, elongation after fracture reaching more than 35%, meeting the requirements for single-sided enamel use, yield strength attenuation after firing less than 20MPa, and good adhesion performance.

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Abstract

This invention provides a high-performance uniform production method for high-strength pickled enamel steel using a straight-through rolling process. The chemical composition of the high-strength pickled enamel steel, by weight percentage, includes: C: 0.04~0.08%; Si: ≤0.05%; Mn: 0.20%~0.40%; P ≤0.020%; S: 0.01~0.02%; Al: 0.020%~0.040%; Ti: 0.030%~0.045%; N: 0.0030~0.0070%, with the remainder being Fe and unavoidable impurities. The resulting high-strength pickled enamel steel exhibits a yield strength difference (head, middle, and tail) ≤25MPa, an adhesion test grade of 1~2, and excellent enamel coating effect.
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