A method for preparing a 500 MPa grade galvannealed high-strength steel strip for low-cost photovoltaic supports

By employing a process of smelting-continuous casting-hot rolling-pickling-cold rolling-continuous hot-dip galvanizing, a low-cost, high-strength, and corrosion-resistant galvanized aluminum-magnesium high-strength steel strip for photovoltaic brackets was produced. This solved the high strength and corrosion resistance requirements of photovoltaic bracket materials in existing technologies, achieving improved mechanical properties and reduced costs.

CN122405944APending Publication Date: 2026-07-17INNER MONGOLIA BAOTOU STEEL UNION
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Patent Information

Application Number
CN202610726717.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-25
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies cannot provide low-cost, high-strength, and corrosion-resistant galvanized aluminum-magnesium high-strength steel strips for photovoltaic brackets, thus failing to meet the photovoltaic industry's demand for high-strength, high-corrosion-resistance, and low-cost materials.

Method used

The process of smelting-continuous casting-hot rolling-pickling-cold rolling-continuous hot-dip galvanizing is adopted, and the chemical composition and process parameters are controlled to prepare galvanized aluminum-magnesium high-strength steel strip with a yield strength of 500MPa. This includes specific component ratios and process flows such as converter top and bottom blowing smelting, LF ladle refining, hot rolling and cold rolling processes.

Benefits of technology

A galvanized aluminum-magnesium high-strength steel strip for photovoltaic brackets was prepared, which has high strength, good bending performance, corrosion resistance, and low alloy cost. Its mechanical properties meet the requirements of yield strength ≥500MPa and tensile strength ≥530MPa, making it suitable for various natural environments.

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Abstract

本发明公开了一种低成本光伏支架用屈服强度500MPa级镀锌铝镁高强钢带的制备方法，包括：冶炼—连铸：供铸机钢水质量百分比的化学成分为C：0.16‑0.18%，Si≤0.08%，Mn：0.80‑1.20%，P≤0.025%，S≤0.020%，Ti：0.070‑0.085%，Alt：0.015‑0.050%，Ca：0.0005‑0.0030%，其余为Fe及杂质；热轧；酸洗冷轧；连续热镀锌、光整工艺。本发明制备的产品具有较高的强度、良好的折弯性能、较强的耐腐蚀性、相对较低的合金成本等特点，符合光伏行业对光伏支架用钢高强度、高耐腐蚀性、低成本选材需要。
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