Types of sheet metal materials
There are many sheet metal materials suitable for stamping. Sheet metal materials widely used in electronic and electrical industries include the following:
- Cold-rolled steel sheet / SPCC
The steel ingot is continuously rolled into steel coil or sheet with required thickness by cold rolling mill. These coils and sheets are SPCC. There is no protection on the surface of SPCC, which is easy to be oxidized when exposed to the air. Especially in humid environment, the oxidation speed is accelerated and dark red rust appears. The surface shall be painted, electroplated or otherwise protected during use.
- Steel plate galvanized / SECC
The substrate of SECC is a general cold-rolled steel coil, which becomes an electro galvanized product after degreasing, pickling, electroplating and various post-treatment processes in the continuous electro galvanized production line. SECC not only has the mechanical properties and similar processability of general cold-rolled steel sheets, but also has superior corrosion resistance and decorative appearance. It has great competitiveness and substitutability in the market of electronic products, household appliances and furniture. For example, SECC is widely used in computer chassis.
- Hot-dip galvanized steel / SGCC
Hot dip galvanized steel coil refers to the semi-finished products after hot-rolled pickling or cold rolling, which are cleaned and annealed, immersed in the zinc melting tank with a temperature of about 460 ° C, and then coated with zinc layer, and then quenched, tempered, leveled and chemically treated. SGCC material is harder than SECC material. It has poor ductility, thick zinc layer and poor weldability.
- Stainless steel 301 / SUS301
The content of Cr (chromium) is lower than SUS304 and the corrosion resistance is poor, but it can obtain good tensile force and hardness after cold processing, and has good elasticity. It is mostly used for shrapnel spring and anti EMI.
- Stainless steel 304 / SUS304
This is one of the most widely used stainless steels. Because it contains Ni (nickel), it is richer in corrosion resistance and heat resistance than Cr (chromium) steel. It has very good mechanical properties, no heat treatment hardening phenomenon and no elasticity.