1. Alloyed cold-rolled steel sheet : This special-shaped tube steel sheet is manufactured by hot-dip method, but immediately after exiting the tank, it is heated to about 500°C to form an alloy film of zinc and iron. This galvanized sheet has good paint adhesion and weldability;
2. Single-sided and double-sided differential cold-rolled steel sheets: Single-sided cold-rolled steel sheets are products that are galvanized on one side only. In welding, painting, anti-rust treatment, processing, etc., it has better adaptability than double-sided galvanized sheet. In order to overcome the shortcomings of uncoated zinc on one side, there is another kind of galvanized sheet coated with a thin layer of zinc on the other side, that is, double-sided differential galvanized sheet;
3. Hot-dip cold-rolled steel sheet: immerse the thin steel sheet in the molten zinc tank to make the thin steel sheet with a layer of zinc adhered to the surface. At present, the continuous galvanizing process is mainly used for production, that is, the rolled steel sheet is continuously immersed in a galvanized bath with molten zinc to make a galvanized coil;
4. Alloy and composite cold-rolled steel sheet: it is a steel sheet made of zinc and other metals such as lead and zinc alloy or even composite plating. This special-shaped tube steel sheet not only has excellent anti-rust performance, but also has good coating performance;
5. Electric cold-rolled steel sheet: The cold-rolled steel sheet for special-shaped tubes manufactured by electroplating has good workability. However, the coating is thinner and the corrosion resistance is not as good as the hot-dip galvanized sheet.
In addition to the above five types, there are also colored cold-rolled steel sheets, printed coated cold-rolled steel sheets, and PVC laminated cold-rolled steel sheets. According to the purpose, cold-rolled steel sheets can be divided into cold-rolled steel sheets for general use, roofing, building exterior panels, structural use, corrugated sheeting, drawing and deep drawing.
