First, the raw material ready to hot rolled steel coil according to the varieties, specifications from DaiGangChang by pickling coil in the library before cooling and storage, and then as planned by the coil of the rolls of the coil to pickling line feed section steel coil transport mechanic, decoiling, welding, mechanical breaker within the unit and pickling tank baptism, to remove iron oxide on the surface of the steel strip, and rinse. Most strips need to be further rolled without head and treated. Conventionally rolled strips do not undergo purification and are later oiled. Finally, the specified steel coil is rolled in the unit and stored in the warehouse before the rolling mill. The cut waste edge is cut into pieces and shipped out of the factory for rolling. For 5-2mm thick strip, full continuous headless rolling is available and conventional single roll rolling is used. In the case of headless rolling, the steel coil is stored in looper and rolled continuously in five stands to the final thickness, and then cut on the flying shears behind the final stand of the mill. When conventional rolling is adopted, the steel coil is uncoiled on the no.1 uncoiler in the feeding section, and the strip is rolled into each frame in turn, and recoiled by the coiler in the discharging section, which is sent to different units for processing according to different products. 

Annealed flat, most of the cold rolled strip used for general purpose, deep drawing and special drawing is annealed in the hood furnace to improve the mechanical properties of the strip. After cooling, it is sent to the leveling machine, and the tension roller group before the leveling machine or across the tension roller group is directly leveled on the leveling machine. When leveling, the leveling agent can be sprayed for wet leveling, or dry leveling. Generally, the leveling amount is below 3%, and the mechanical properties and quality of the strip can be further improved after leveling.

Some cold-rolled strips are uncoiled and welded in the continuous annealing furnace, stored in looper, and then treated and cleaned, and continuously annealed in the vertical furnace. After coming out of the annealing furnace, it is leveled, straightened and trimmed, and then rolled into steel coil according to the specified weight, which is sent to the intermediate warehouse by transport plane for storage. 

Flat or continuously annealed coils may be processed in crosscutting, slitting or rewinding units. 

Hot-dip galvanized steel sheet and cold-rolled strip shall be sent directly to the feeding section of hot-dip galvanized unit in the warehouse. The steel coil shall be uncoiled and welded in the unit, and then enter the processing section of the unit through looper. Strip in the furnace without terbium first preheating and surface coating of oil, if pick up into the oxygen reduction furnace, heat treatment, and suitable surface for strip steel galvanized next, pull from the furnace directly into zinc pot, zinc coating on the surface, then gas injection, control the zinc layer thickness and with zinc controller control the size of the crystallization of zinc zinc layer, after cooling, Also according to the need of galvanized strip finishing, stretching straightening, surface chemical treatment and other processes. In the discharge section, it is printed, oiled and rolled into galvanized steel coils. If the pipe is delivered according to the steel plate status, the steel coil will be sent to the crosscutting unit for cutting and packaging.