Cold Rolling is a process by which the sheet metal or strip stock is introduced between rollers and then compressed and squeezed. Galvanizing or HDG is a process in which zinc bonds to steel at the molecular level to produce a four-layer corrosion-resistant finish. The first three layers are zinc-iron alloy layers that are actually harder than the base steel. The fourth or top layer is pure zinc. We can supplier the broad modals of galvanized steel plain sheet , cold-rolled steel sheets in our business line .