Galvanized steel sheet coils, with excellent corrosion resistance and formability, serve as a core basic raw material in the construction, home appliance, automobile, and other industries. The slitting deep processing is a key procedure that longitudinally and precisely cuts wide galvanized steel sheet coils into narrow-width coils according to downstream demands. Its process characteristics and application uses are as follows:
Specialized slitting equipment paired with cemented carbide circular knives is adopted. During the slitting process, the width tolerance of the strip can be precisely controlled (the conventional tolerance is ±0.1–0.3mm), resulting in smooth, burr-free, and curl-free cut edges, which eliminates the risk of edge corrosion. Meanwhile, the slitting tension can be adjusted as required to ensure the flatness of the slit narrow-width coils without warping or distortion.
The entire slitting process adopts scratch-proof guide rollers and flexible conveying design, which minimizes the abrasion or scratch of the galvanized coating and color coating (for color-coated galvanized coils). Some high-precision slitting production lines are also equipped with edge deburring and passivation functions to further enhance the edge corrosion resistance of the slit coils.
Wide-width galvanized steel sheet coils (e.g., 1000mm, 1250mm, 1500mm) can be slit into various narrow-width sizes according to customers’ specifications, with the slitting width ranging from 20mm to the original width of the coil. The process supports both mass continuous slitting and small-batch customized orders, featuring high production efficiency and short delivery cycles.
Multiple inspection procedures are set up before and after slitting. Before feeding, the galvanized layer thickness and surface quality of the original coils are verified; during slitting, the width and plate shape are monitored in real time; after the finished products are produced, weighing, coiling, and packaging are carried out. All these steps ensure that the specifications and performance of each slit coil meet the customer requirements.
Slit narrow-width galvanized coils are the core raw material for manufacturing profiled steel sheets (such as HV-225 roof/wall color steel sheets), light steel keels, and metal corrugated sheets. The precise width dimensions can match the feeding requirements of profiling equipment, ensuring the lap joint accuracy and structural stability of the formed sheets. They are widely used in the enclosure systems of industrial plants, warehouses, and steel structure buildings.
They are used to produce shells, inner containers, brackets, and other components of refrigerators, washing machines, air conditioners, and other home appliances. The slit coils can be directly put into stamping and bending processes. The high-precision dimensions reduce processing waste and improve production efficiency, while the intact galvanized coating ensures the corrosion resistance of home appliance components and extends their service life.
They serve as the raw material for stamping parts such as auto door frames, trunk bottom plates, and chassis protection parts. The slit galvanized coils, with precise dimensions and flat plate shape, can meet the high-precision stamping requirements of automobile manufacturing. Their excellent corrosion resistance enhances the rust resistance of auto parts, making them suitable for the humid and highly corrosive working environments like automobile chassis.
They are applied to the production of guardrails, shelves, hardware stamping parts, pipe supports, and other products. Narrow-width galvanized coils facilitate subsequent processing such as welding, bending, and punching. Customized slitting specifications can be provided according to the size requirements of different hardware products, reducing the raw material cutting costs for small and medium-sized enterprises.