Cold rolled

The HOT rolled steel coil is used as raw material, the oxide skin is removed by pickling, and the finished product is rolled hard coil. The cold work hardening caused by continuous cold deformation increases the strength and hardness of rolled hard coil, decreases the toughness and plastic index, and deteriorates the stamping performance, so it can only be used for simple deformed parts. Hard rolling coil can be used as raw material for hot dip galvanizing plant because hot dip galvanizing units are equipped with annealing line. The rolling coil weight is generally 6~13.5 tons, and the inner diameter of the steel coil is 610mm. In order to eliminate cold working hardening and rolling STRESS and reach THE mechanical properties SPECIFIED in the STANDARD, the plate and reel should be annealed by continuous annealing (CAPL unit) or hood furnace. The surface quality, appearance and dimensional accuracy of cold rolled steel plate are better than those of hot rolled steel plate.

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Cold rolled strip is widely used, such as automobile manufacturing, electrical products, rolling stock, aviation, precision instruments, canned food, etc. Cold rolled sheet steel is the abbreviation of common carbon structural steel cold rolled sheet, also known as cold rolled sheet, commonly known as cold plate, sometimes mistakenly written as cold tied sheet. Cold plate is made of ordinary carbon structural steel hot rolled steel strip, after further cold rolling into a thickness of less than 4mm steel plate. Due to rolling at room temperature, does not produce iron sheet, therefore, cold plate surface quality, high dimensional accuracy, coupled with annealing treatment, its mechanical properties and process properties are better than hot rolled thin steel sheet, in many fields, especially in the field of home appliance manufacturing, has gradually replaced hot rolled thin steel sheet.