Steel Technological

Big spangle galvanized sheet

Big spangle galvanized sheet
This is one of the most original production of galvanized steel, well known, total zinc and lead ore symbiotic, in the smelting of zinc, lead is not possible to remove all impurities, the content of 0.05% or more can be formed in a large spangle. Each one spangle, its crystallization centers are raised, the edge is concave, the surface is uneven appearance, which its subsequent processing and coating are unfavorable. Furthermore, since the amount of lead in the zinc solution is very low, it will precipitate during the cooling at the grain boundaries, resulting in stress and electrochemical corrosion at the grain boundaries, so that intergranular corrosion of galvanized layer, reducing its corrosion resistance. Thus, in recent years this has been gradually understanding large spangle galvanized sheet will be gradually phased out.
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