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PO product is called pickled & oiled coil. The surface scale is removed during acid pickling process with hot rolled coil, rust preventive oil is spread to protect product from corrosion and the rate of rust preventive oil being spread can be designated according to the particularity of the process on customer’s order.

HGI product is called hot dip galvanized steel.The surface scale is removed during acid pickling process and Zn coating is done on surface through Zn coating bath. Normally, chromic acid or cr-free is used to avoid white corrosion when Zn layer on layer is exposed to air.

	Plating Layer	Summary Picture
PO;Pickled & Oiled coil	None		Processing Ability Welding Ability Coating Ability
HGI;Hot dip galvanized steel	Pure Zn layer		Corrosion Resistance Processing Ability