Steel-N.com : Our Products- Cold Rolled Sheets

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		Pickling The hot-rolled coil passes through the pickling line, where hydrochloric acid solution is used to remove surface scale for smooth surface finish before further processing. After pickling, the steel is thoroughly washed, dried and oiled before undergoing the cold-rolling process
		Cold Rolling Pickled coils are rolled in the tandem cold-rolling mill where they are processed into a specified thickness.Generally, the rolling reduction ratio is 40 to 90 percent. The critical point at this stage of the process is to maintain uniform and precise flatness throughout the entire length of the coil.The rolling process is automatically controlled by the latest computer technology.
		Electrolytic Cleaning The main purpose of electrolytic cleaning is to remove the lubricant left on the strip surface after rolling.Every trace of surface oil is removed by saponification and emulsification of steel in alkaline solution.This degreasing process is necessary for the production of cold rolled strip with smooth surface.
		Annealing After cold-rolling, the steel strip is hard and brittle with its grains elongated in the rolling direction.To obtain the desired grain structure and to improve the mechanical properties, the strip is annealed at an elevated temperature in a reducing atmosphere.
		Temper Rolling Temper rolling slightly reduces the size of the annealed coil to provide a degree of surface hardening that restores temper and prevents strain or coil breakage.
		Finishing and Inspection Product thickness, width and surface quality are checked during this stage.Product samples are also sent to the laboratory for mechanical properties inspection and other testings.Finally, rust-preventive oil is applied to the products and they are packed for shipment.