ASTMA528 -- 90 Deep drawing hot dip galvanized steel coil; Hot dip galvanized steel coil for roofing and wainscoting;
Astma 444-89 hot dip galvanized steel coil for ditches;
alvanized Steel Coil gets coated in layers of zinc because rust won't attack this protective metal. The most external layer is all zinc, but successive layers are a mixture of zinc and iron, with an interior of pure steel.



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