Commonly used stamping materials usually include: various steel plates, stainless steel plates, aluminum plates, copper plates and other non-metallic plates. The classification of steel plates (including strip steel):
1. Classification by thickness: (1) Thin plate (2) Medium plate (3) Thick plate (4) Extra-thick plate 2. Classification by production method: (1) Hot rolled steel plate (2) Cold rolled steel plate 3. According to surface characteristics Classification: (1) Galvanized sheet (hot-dip galvanized sheet, electro-galvanized sheet) (2) Tin-plated sheet (3) Composite steel sheet (4) Color coated steel sheet 4. Classification by use: (1) Bridge steel sheet (2) Boiler steel plate (3) Shipbuilding steel plate (4) Armor steel plate (5) Automobile steel plate (6) Roof steel plate (7) Structural steel plate (8) Electrical steel plate (silicon steel sheet) (9) Spring steel plate (10) Others
What we usually call stamped steel plates mostly refers to thin steel plates (strips); the so-called thin steel plates refer to steel plates with a thickness of less than 4mm, which are divided into hot-rolled plates and cold-rolled plates Zinc die casting Manufacturers.
Hot rolling uses slabs (mainly continuous casting slabs) as raw materials. After heating, the rough rolling mill and the finishing mill make strip steel. The hot steel strip from the last rolling mill of finishing rolling is cooled to a set temperature by laminar flow, and then coiled into a steel strip coil by the coiler. The cooled steel strip coils are processed into steel plates, flat coils and flat coils according to the different needs of users through different finishing lines (flattening, straightening, cross-cutting or slitting, inspection, weighing, packaging and marking, etc.) Slitting steel strip products. To put it simply, a steel billet is heated (that is, the red hot steel block in the TV) after several passes, and then trimmed to form a steel plate. This is called hot rolling.
Cold rolling: Hot-rolled steel coil is used as raw material, after pickling to remove oxide scale, cold rolling is carried out. The finished product is hard-rolled coil. Cold work hardening caused by continuous cold deformation increases the strength, hardness and toughness of the hard-rolled coil. Plastic index declines, so the stamping performance will deteriorate, and it can only be used for simple deformed parts. Hard rolled coils can be used as raw materials for hot-dip galvanizing plants, because hot-dip galvanizing lines are equipped with annealing lines. The weight of the rolled hard coil is generally 6 to 13.5 tons, and the steel coil is continuously rolled on the hot-rolled pickled coil at room temperature. The hard-rolled sheet has high hardness (HRB greater than 90) and poor machining performance because it has not been annealed. It can only be processed with a simple directional bending process (perpendicular to the coiling direction) of less than 90 degrees. Simply put, cold-rolled plates are processed and rolled on the basis of hot-rolled coils. Generally speaking, it is a process of hot rolling-pickling-cold rolling.
Since cold-rolled sheets are processed from hot-rolled sheets at room temperature, although the rolling process will heat up the steel sheets, people still call cold-rolled sheets produced by this production process. Because the hot-rolled sheet is continuously cold-deformed, the cold-rolled sheet has poor mechanical properties and high hardness. It must be annealed to restore its mechanical properties, so the cold-rolled sheets we usually use are annealed, so the hardness is lower than that of the hot-rolled sheet, and the toughness is better than that of the hot-rolled sheet, and the surface quality is also good many! The ones that have not been annealed are called rolled hard coils, which are generally used to make products that do not need to be bent or stretched.