What are the commonly used materials for hot rolled sheet metal processing?

The base material of SECC is common cold-rolled steel coil. After degreasing, pickling, electroplating and various post-treatment processes, it becomes an electro-galvanized product. SECC not only has the mechanical properties and approximate machinability of common cold-rolled steel plates, but also has excellent corrosion resistance and decorative appearance. It has great competitiveness and substitution in the markets of electronic products, household appliances and furniture. For example, the commonly used computer case is SECC SPCC, which means that steel ingots are continuously rolled into coils or steel plates with required thickness by cold rolling mill. The surface of SPCC is unprotected, and it is easy to be oxidized when exposed to air, especially in humid environment, the oxidation speed is accelerated and dark red rust appears. When in use, the surface should be painted, electroplated or otherwise protected.

Hot-dip galvanized steel coil refers to the semi-finished products after hot rolling, pickling or cold rolling, which are washed, annealed and immersed in molten zinc bath at a temperature of about 460℃ to coat the steel plate with zinc layer, and then tempered, leveled and chemically treated. SGCC material is harder than SECC material, with poor ductility (avoiding deep drawing design), thicker zinc layer and poor weldability. One of the most widely used stainless steels, because it contains Ni (nickel), has better corrosion resistance and heat resistance than steel containing Cr (chromium), and has very good mechanical properties, no heat treatment hardening and no elasticity. The content is lower than SUS304, and the corrosion resistance is poor. However, after cold working, good tensile force and hardness can be obtained during stamping, and the elasticity is good. It is mainly used for leaf springs and is one of the most widely used anti-electromagnetic interference stainless steels. Because it contains Ni (nickel), it has better corrosion resistance and heat resistance than steel containing Cr (chromium), has very good mechanical properties, does not need heat treatment and hardening, and has no elasticity. 5. The content of stainless steel SUS30 1Cr (chromium) is lower than that of SUS304, and its corrosion resistance is poor. However, after cold working, it can obtain good tensile force and hardness and good elasticity when stamping, which is mostly used for leaf springs and EMI prevention.