A method for preparing continuously hot-dip galvanized steel strip

By adjusting the composition of the strip steel substrate and the hot-dip galvanizing process, especially by introducing rare earth elements Yb and Dy, and optimizing the zinc bath composition, the problems of zinc layer thickness and uniformity were solved, and the corrosion resistance and mechanical properties of galvanized strip steel were improved.

CN117625908BActive Publication Date: 2026-05-26TANGSHAN SHENGXIN COLD ROLLED SHEET CO LTD
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Patent Information

Application Number
CN202311664021.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-06
Publication Date
2026-05-26
Estimated Expiration
2043-12-06

AI Technical Summary

Technical Problem

In existing technologies, galvanized steel strips have poor corrosion resistance and mechanical properties, and the thickness and uniformity of the galvanized layer are difficult to control to meet high-quality requirements, resulting in limited product performance.

Method used

By adjusting the chemical composition of the strip substrate and the hot-dip galvanizing process parameters, especially by introducing rare earth elements Yb and Dy, the composition of the zinc bath is optimized, the coating quality is controlled, and the wettability and coating uniformity of the zinc bath are improved.

Benefits of technology

It significantly improves the mechanical properties and corrosion resistance of hot-dip galvanized steel strip, ensures coating quality, and enhances the overall performance of the product.

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Abstract

This invention relates to the field of metallurgical technology and proposes a method for preparing continuously hot-dip galvanized steel strip, comprising the following steps: molten iron pretreatment, smelting, refining, hot rolling, and cold rolling to obtain a steel strip substrate; electrolytic cleaning of the steel strip substrate, annealing followed by hot-dip galvanizing treatment, cooling, and post-treatment to obtain hot-dip galvanized steel strip; the steel strip substrate is composed of the following components by mass percentage: C 0.09%~0.12%, Mn 0.9%~1.15%, Al 0.03%~0.05%, B 0.004%~0.005%, Nb 0.02%~0.04%, Si≤0.01%, Ca 0.003%~0.005%, Yb 0.001%~0.003%, with the balance being Fe and other unavoidable impurities. This technical solution solves the problem of poor corrosion resistance and mechanical properties of existing galvanized steel strips.
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