Zn-al-mg plated corrugated steel sheet

By controlling the chemical composition and heating/cooling rate of the Zn-Al-Mg alloy coating, the deformation problem of the convex and flat parts of the textured steel sheet after hot-dip galvanizing was solved, thereby improving the uniformity and corrosion resistance of the coating and enhancing its processability.

CN117062935BActive Publication Date: 2026-06-12NIPPON STEEL CORPORATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NIPPON STEEL CORPORATION
Filing Date
2022-04-05
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

After hot-dip galvanizing with Zn-Al-Mg alloy, the expansion and contraction of the raised and flat parts of the textured steel sheet are different due to temperature changes, resulting in deformation and uneven coating thickness, which affects corrosion resistance and processability.

⚗Method used

By controlling the chemical composition of the Zn-Al-Mg alloy coating and the heating and cooling rates during the coating process, uniform heating and cooling of the convex and flat parts are ensured, and the conditions of specific layer thickness ratio and gap height are met, resulting in a coated textured steel sheet with excellent flatness, corrosion resistance and workability.

🎯Benefits of technology

The flatness, corrosion resistance and processability of Zn-Al-Mg coated textured steel sheets have been improved, the unevenness of the coating has been suppressed, and the overall performance of the product has been improved.

✦ Generated by Eureka AI based on patent content.

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Abstract

The Zn-Al-Mg plated corrugated steel sheet of the present application is a Zn-Al-Mg plated corrugated steel sheet having a convex portion and a flat portion on the surface of the sheet, the plated layer has a prescribed chemical composition, and when a cut surface obtained by cutting the central portion of the convex portion in the length direction thereof and in a direction orthogonal to the length direction of the convex portion and along the thickness direction of the sheet is observed, the layer thickness ratio (layer thickness of the left side plated layer / layer thickness of the right side plated layer) of the plated layer of the flat portion at the left and right of the convex portion is 0.2 or greater and 5.0 or less, and the height of the corrugation T-t when the thickness of the base corrugated steel sheet at the convex portion is set to T and the thickness of the base corrugated steel sheet at the flat portion is set to t and the gap height x when the plated corrugated steel sheet is left to stand and the surface on which it is left to stand satisfy the following formula 1 and formula 2, formula 1: x / (T-t)≤1.5 formula 2: 0.5
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