Cold-Rolled Steel Sheet

Cold-rolled steel sheet is a semi-finished industrial material produced by passing hot-rolled steel through rollers at room temperature to achieve precise thickness, dimensional accuracy, and superior surface quality. In metal furniture manufacturing, it serves as the primary structural substrate for office desks, filing cabinets, industrial workbenches, and storage systems. This material enables high-volume production through efficient stamping, bending, and welding processes while maintaining consistent mechanical properties. As a B2B commodity, it flows through industrial supply chains from steel mills to furniture fabricators who transform it into finished products. The material is typically supplied in coil form, with coil weights ranging from 5 to 15 tonnes, which affects handling and logistics. Thickness ranges from 0.3 to 3.0 mm, and width from 600 to 1500 mm, per GB/T 708. Mechanical properties include yield strength of 180–360 MPa, tensile strength of 270–420 MPa, elongation of 26–40%, and hardness of 45–80 HRB, as specified in GB/T 5213. Surface finish is classified as B to D (Ra) per GB/T 708, and flatness tolerance is ≤5 mm/m. Chemical composition is limited to low carbon (≤0.12% C), manganese (≤0.50% Mn), phosphorus (≤0.035% P), and sulfur (≤0.035% S) to ensure weldability and ductility. For corrosion resistance, galvanized variants have a zinc coating mass of 60–180 g/m² per GB/T 2518. These parameters are reference ranges; actual values must be confirmed with the supplier for specific applications. The material is suitable for stamping, bending, and welding, but its formability depends on the grade and surface treatment. Buyers should verify that the supplied material meets the required mechanical and dimensional tolerances for their intended use. Standards such as GB/T 708 and GB/T 5213 serve as procurement references, not as proof of certification. Always consult the manufacturer or supplier for model-specific data and compliance.

Hot-rolled steel is cleaned, pickled, and passed through tandem rolling mills at ambient temperature, reducing thickness through plastic deformation while improving surface finish and dimensional tolerance. The process involves multiple passes to achieve the desired thickness and mechanical properties. Cold rolling increases strength through strain hardening but reduces ductility, so subsequent annealing may be applied to restore formability. The final product has a smooth, uniform surface suitable for painting or coating. The process parameters, such as reduction ratio and rolling speed, are controlled to meet specified tolerances. The material's mechanical properties, including yield strength and elongation, are influenced by the degree of cold reduction and any heat treatment. For furniture applications, the sheet must exhibit consistent flatness and surface quality to ensure efficient fabrication. Verification of these properties requires tensile testing and surface roughness measurement per relevant standards.