High-surface-quality aluminum coating steel plate and production method thereof

Abstract

The invention provides a high-surface-quality aluminum coating steel plate and a production method thereof. The high-surface-quality aluminum coating steel plate and the production method thereof comprises a substrate and a coating layer; the substrate contains C larger than or equal to 0.0010% and less than or equal to 0.25%, Si larger than or equal to 0.010% and less than or equal to 0.60%, Mn larger than or equal to 0.06% and less than or equal to 2.0%, P less than or equal to 0.015%, S less than or equal to 0.025%, 0.030% to 0.055% of Als, N less than or equal to 0.0050%, Ti less than or equal to 0.10%, Nb less than or equal to 0.10%, Cr less than or equal to 0.15%, B less than or equal to 0.0035%, and the balance Fe and inevitable impurities. The coating layer contains 7% to 11% of Si, 1.0% to 3.0% of Fe, 0.05% to 0.20% of La, 0.05% to 0.2% of Ti, and the balance Al and inevitable impurities. Compared with the prior art, the aluminum coating silicon steel plate produced by the method is high in surface quality, no obvious aluminum flowers are seen, and the surface quality reaches more than FC grade.

Description

technical field [0001] The invention belongs to the technical field of hot-dip plated steel plate processing, and relates to an aluminum plated steel plate with high surface quality and a production method. Background technique [0002] Hot-dip aluminum-silicon coating is an efficient surface protection technology developed after hot-dip galvanizing. It is a protection method that integrates the comprehensive functions of steel surface strengthening, surface protection and surface beautification. Aluminum-silicon coated steel sheet not only has the silver-white appearance and weather resistance of aluminum, but also has excellent resistance to H 2 Corrosion performance of strong corrosive agents such as S, good high temperature oxidation resistance, wear resistance and excellent reflection performance to light and heat, etc. [0003] Due to the excellent performance of hot-dip aluminum-silicon steel plate, it has been widely used, and its excellent performance has been con...

AI Technical Summary

Problems solved by technology

The patented substrate is for hot forming steel, and the hydrogen content in the reduction section of the annealing furnace is relatively high, which poses a large safety hazard in industrial production

And in its patent, the steel plate is rapidly cooled at ≥120°C / s between the aluminum pot and the solidification point of the aluminum-silicon alloy to control the growth of the alloy layer. The cooling rate is fast, and it is not feasible in actual production.

[0005] Chinese Patent No. 201110399806.9 "A Production Method for Continuously Hot-dip Al-Si-Ti-B Alloy Steel Sheet" and Chinese Patent No. 200910231746.2 "A Production Method for Continuous Hot-Dip Aluminum-Si-Cu-Mg Alloy Steel Sheet", passed in Adding a small amount of Ti, B, Cu, and Mg to the aluminum-silicon plating solution increases the cost compared with the addition of rare earth, and the addition of Cu content will cause a decrease in corrosion resistance

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