Cold Rolled Commercial Quality Sheets

Cold Rolled Commercial Quality Sheets have an unlimited number of uses and applications, such as automobile parts including interior and exterior parts including roofs, appliance parts, highly formable parts, parts needing good dent resistance, parts that demand a high surface finish and high strength formed parts, furniture parts including structural strength for upholstered furniture and exposed parts of metal furniture, cabinets, cabinet and furniture hardware, light industrial applications such as tool boxes, shelving, and lighting fixtures, and general utility uses.

Cold rolled steel sheets offer a variety of outstanding properties, including easy formability and a smooth, clean surface, and are used in automobiles, appliances, furniture, and many other everyday items.

Cold rolling

The thickness accuracy of cold rolled products is determined by the cold rolling process. Rolling force and strip tension are computer-controlled to minimize thickness deviations during rolling, based on measurements of the strip thickness at the entry and delivery sides of the mill.

Cleaning

Rolling oil on the cold rolled strip is burned off during annealing, which is the next process after cold rolling. Other types of rolling oil are removed by electrolytic cleaning prior to annealing. In particular, electrolytic cleaning is used with products which require a clean surface to ensure good paintability

Annealing

The formability of products is determined by annealing. Because cold rolling significantly increases material hardness, making forming difficult, annealing is performed to improve ductility by inducing a recrystallized structure in the steel. As the annealing process, coils are piled and covered by the box and annealed and this is called the batch annealing. The other is the continuous annealing process, in which coils are continuously treated.

Skinpass rolling

Annealed coils are lightly rolled by the skinpass mill to prevent a defect called stretcher strain, improve strip shape, and adjust mechanical properties. Skinpass rolling is also used to produce dull finish and bright finish products.

Finishing

After skinpass rolling, coils are processed at the recoiling line, where they are cut to produce product coils of the specified weight, or at the shearing line, where they are cut to sheets of the specified dimensions. Product thickness, width, shape, and surface quality are inspected, and mechanical properties are tested using specimens taken at the finishing line.

Chemical Composition

DC01 steel chemical composition is listed in the following table based on ladle analysis.

Country (Region)	Standard	Chemical Composition (ladle analysis), %, ≤	Surface quality	Deoxidation	Classification
Steel name (Steel number)	C	Mn	P	S
European Union	EN 10130	DC01 (1.0330)	0.12	0,60	0,045	0,045	A, B	Manufacturer’s discretion	Non-alloy quality steel
EN 10152	DC01+ZE (1.0330+ZE)	A, B
EN 10139	DC01-C390, C340, C440, C490, C590, C690	–