Commonly used stamping materials include various steel plates, stainless steel plates, aluminum plates, copper plates, and other non-metallic plates,When you do stamping part,sheet metal fabrication,CNC part or cold-roll forming part, you need know the material features.
Classification of steel plates (including strip steel):
1. Classified by thickness: thin plate, medium plate, thick plate, extra thick plate
2. Classification by production method: hot-rolled steel plate, cold-rolled steel plate
3. Classified by surface characteristics: galvanized sheet (hot-dip galvanized sheet, electrogalvanized sheet), tinplate, composite steel plate, and color coated steel plate
4. Classified by purpose: bridge steel plate, boiler steel plate, shipbuilding steel plate, armored steel plate, automotive steel plate, roof steel plate, structural steel plate, electrical steel plate (silicon steel sheet), spring steel plate, others
What we usually refer to as stamped steel plates and sheets refers to thin steel plates (strips); The so-called thin steel plate refers to a steel plate with a thickness of less than 4mm, which is divided into hot-rolled plate and cold-rolled plate.
Hot rolling is the process of using slabs (mainly continuous casting slabs) as raw materials, which are heated and then made into strip steel by roughing and finishing mills. The hot steel strip from the last finishing mill is cooled by laminar flow to the set temperature, and then rolled into steel strip coils by the coiler. The cooled steel strip coils are processed into steel plates, flat coils, and longitudinally cut steel strip products through different finishing lines (leveling, straightening, transverse or longitudinal cutting, inspection, weighing, packaging, and labeling) according to the different needs of users. Simply put, after heating a steel billet (which is the red and hot steel block burned in television), it undergoes several rounds of rolling, edge cutting, and straightening to become a steel plate, which is called hot rolling.
Cold rolling: Hot rolled steel coils are used as raw materials, and after acid washing to remove oxide scales, cold continuous rolling is carried out. The finished product is rolled hard coils. Due to the cold work hardening caused by continuous cold deformation, the strength and hardness of the rolled hard coils increase, and the toughness and plasticity index decrease. Therefore, the stamping performance will deteriorate, and can only be used for parts with simple deformation. Rolling hard coils can be used as raw materials for hot-dip galvanizing plants, as hot-dip galvanizing units are equipped with annealing lines. The weight of the rolled hard coil is generally 6-13.5 tons, and the steel coil is continuously rolled on the hot-rolled pickling coil at room temperature. Due to the lack of annealing treatment, the hardness of the hard rolled plate is very high (HRB greater than 90), and its mechanical processing performance is extremely poor. It can only be subjected to simple directional bending processing with less than 90 degrees (perpendicular to the coiling direction).
Simply put, cold rolled sheets are processed and rolled on the basis of hot-rolled coils. Generally speaking, it is a processing process such as hot rolling, pickling, and cold rolling.
