The entire surface of durgrip galvannealed showed red rust. Superdyma is a new type of highly corrosion resistant coated steel sheet with a coating composition consisting of zinc as the main substrate in combination with aluminum about 11 magnesium about 3 and a trace amount of silicon adding al mg and si to superdyma the composite effect of these added elements improves corrosion resistance compared with hot dip galvanized steel sheet and hot dip galvanized 5 aluminium alloy steel sheet superdyma has less adhesion but equal corrosion. Focusing mainly on superdyma this paper presents nippon steel sumitomo metal s coated sheet products for structural use and technically reviews the mg addition which enabled the develop ment of the product.
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