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. Supply superdyma steel coil sheet al mg zn coated steel standard iso jis astm as en thickness 0 27 9 00mm coating thickness 60 450g m2 skip to content shanghai aiyia industrial co ltd. The entire surface of durgrip galvannealed showed red rust.
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