ALUMINUM ALLOY-COATED STEEL SHEET THAT HAS EXCELLENT WORKABILITY AND CORROSION RESISTANCE, AND METHOD FOR MANUFACTURING IT
Patent Information
- Authority / Receiving Office
- MX · MX
- Patent Type
- Patents
- Current Assignee / Owner
- POHANG IRON & STEEL CO LTD
- Filing Date
- 2022-06-16
- Publication Date
- 2026-06-12
AI Technical Summary
Existing aluminum and zinc plated steel sheets face issues such as microcracks, corrosion resistance, and productivity limitations during hot forming due to alloy phase formation, liquefaction of the plated layer, and difficulty in achieving in-line alloying with high Si content.
An aluminum alloy plated steel sheet with a dual-layer structure comprising an alloy plated layer containing 35 to 50% Fe, 1 to 20% Zn, 0.1 to 1.5% Si, and a non-alloy plated layer with 1 to 30% Zn, 0.1 to 1.8% Si, and a controlled interface roughness of 2.5 μm or less, combined with a manufacturing process involving immersion in a specific aluminum plating bath, cooling, and online alloying at 550°C to 650°C for 1 to 20 seconds.
The solution prevents dust formation, enhances bulging resistance and corrosion resistance, and improves productivity by allowing in-line alloying in a short time, ensuring stable manufacturing and improved adhesion of the plated layer.