Cold rolled refers to the process of continuously rolling hot-rolled steel coils at room temperature after acid washing to remove oxide surface, and finally obtaining cold-rolled steel coils. Cold rolled steel coils, due to their high hardness, have poor mechanical processing performance without annealing treatment and can usually only be used for simple deformation processing. The purpose of cold rolled process is to create thinner metal materials with a good dimensional accuracy and a smooth surface quality.
Features of Cold Rolled process
1. High hardness: Cold rolled steel has a high hardness (HRB greater than 90) due to the lack of annealing treatment, and its mechanical processing performance is poor. It can only be subjected to simple directional bending less than 90 degrees.
2. Good surface quality and high dimension accuracy: Cold rolled steel materials have better surface quality, appearance, and dimensional accuracy than hot rolled steel materials.
3. Limited application fields: Due to its high hardness and low toughness, cold rolled steel materials are mainly used for manufacturing of components that require high strength but do not require complex processing.
Applications of Cold Rolled process
1. Machine manufacturing: In the fields of automobiles, mechanical equipment, aerospace, shipbuilding, etc., cold rolled steel pipes are used to manufacture various components, such as transmission shafts, frames, etc., with high strength and excellent mechanical properties.
2. Petrochemical: Due to its good corrosion resistance, cold rolled steel pipes play an important role in the field of petrochemical. It is usually used for transport various corrosive fluid or gas.
3. Building structures: Due to their high strength, cold rolled steel pipes are usually used for manufacturing of bridges, buildings, and steel structures, etc.
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