Metal plate, a processing process, sheet metal has not yet a relatively complete definition. According to a definition in a foreign professional journal, it can be defined as: sheet metal is for metal sheet (usually below 6mm) a comprehensive cold processing process, including shear, punching/cutting/composite, folding, riveting, splicing, forming (such as car body), etc.. Its remarkable feature is the same thickness of the same part.

There are many sheet metal materials suitable for stamping processing. Sheet metal materials widely used in the electronic and electrical industry include:
SPCC refers to the steel ingot is continuously rolled into steel coil or sheet material of required thickness by cold rolling machine. SPCC surface without any protection, exposure to the air is easy to be oxidized, especially in the humid environment, the speed of oxidation, dark red rust, in use to spray paint, electroplating or other protection surface.
⒉ Galvanized steel plate SECCSECC base material for the general cold rolled steel coil, in the continuous electric galvanized production line after degreasing, pickling, electroplating and various post-processing process, that is, electric galvanized products. SECC not only has the mechanical properties and similar machinability of ordinary cold rolled steel sheet, but also has superior corrosion resistance and decorative appearance. In the electronic products, home appliances and furniture market has a great competitiveness and substitution. For example, SECC is commonly used in computer cases.
Hot dip galvanized steel SGCC hot dip galvanized steel coil refers to the hot pickling or cold rolling semi-finished products, after cleaning, annealing, immersed in the temperature of about 460°C melt zinc tank, and the steel plated with zinc layer, and then by conditioning leveling and chemical treatment. SGCC material is harder than SECC material, has poor ductility (avoiding deep pumping design), thicker zinc layer, and poor weldability.
The content of stainless steel SUS301Cr (chromium) is lower than that of SUS304, the corrosion resistance is poor, but after cold processing can obtain good tension and hardness, good elasticity, mostly used for spring and anti EMI.
Stainless steel SUS304 is used one of the most widely used stainless steel, because it contains Ni (nickel) than Cr (chromium) steel is rich in corrosion resistance, heat resistance, has very good mechanical properties, no heat treatment hardening phenomenon, no elasticity.