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Analysis of The Effect of Element Action on Galvanized Sheet
First, the impact of manganese. Manganese is sometimes added to steel as a performance-enhancing element. If the original plate contains a certain amount of manganese, and the aluminum content in the zinc solution is about 0.15%, it has little effect on the growth of the iron-aluminum compound layer. However, when the aluminum content in the zinc solution is about 0.20%, with the manganese As the content increases, the amount of Fe-Al compound layer formation decreases. Generally, the manganese content in the original plate is controlled at about 0.25% to 0.40%.
Second, the impact of copper. Copper in the original plate can significantly improve the abrasion resistance of the Galvalumed steel sheet made in China, so when producing special-purpose corrosion-resistant galvanized sheet, the original sheet with a copper content of 0.2% to 0.3% is often selected. However, copper-containing steel strips may form network crack defects during hot rolling, which is more obvious after pickling and is still visible after cold rolling. After galvanizing, the plate surface is formed in the same direction as the rolling direction, similar to thick plate scratches. Scars or stripes. Therefore, the galvanized sheet requires copper content not higher than 0.15%.
Third, the effect of phosphorus. Phosphorus is an inexhaustible harmful element in steel. Phosphorus also has a significant adverse effect on zinc plating. When the phosphorus content is about 0.15%, the iron-zinc compound layer becomes thicker, the pure zinc layer becomes thinner, and even the pure zinc layer is completely absent, and the coating appears matte spots. Deteriorate the adhesion of the coating. In addition, steel belts with high phosphorus content are very brittle, especially the extremely thin original plates with a thickness of less than 0.23mm are easily broken when the production line is running. Therefore, the lower the phosphorus content of the galvanized original sheet, the better, and generally less than 0.025%.
Fourth, the impact of sulfur. Sulfur is also an inexhaustible harmful element in steel. Sulfur has little effect on the galvanizing process, but sulfur seriously affects the mechanical properties of the steel strip. Therefore, the lower the sulfur content, the better, generally less than 0.03%.