what is mill phosphatized
The answer is yes, and the added advantage is that the galvanized steel maintains its corrosive protection qualities. Consider Your Steel Type. For exposed ductwork, two types of steel are generally used-hot dipped galvanized steel and âpaint gripâ steel. ï· âPaint Gripâ steel is mill phosphatized or galvannealed. o Galvanneal steel is, as its name implies, annealed. This annealing softens the steel, making it more prone to dings and dents. o Mill phosphatized steel has a zinc phosphate coating. Zinc phosphate is considered dangerous to aquatic life and special handling is required at the mill to prevent its release into the environment.