Stainless steel can be divided into five categories: coils, plates, profiles, steel pipes and parts, the most important being coils and plates. Profiles are materials of various shapes made of plates, such as angle steel, flat steel, I-beam, and channel steel. Steel pipe mainly refers to seamless steel pipe, and the opposite of seamless steel pipe is welded pipe, the difference is whether it is formed at one time. Parts mainly refer to elbows and flanges and other small things.
The coil and the sheet are actually the same, but the form is different from the factory. If it is, it cannot be rolled, generally more than 16 mm can not be rolled.
There are coils, boards, and most of the time they are boards. The price of coils and boards is also different. If it is purchased coils, it is calculated according to actual weight, so the price is high. The board is calculated according to theory, and the price is low. , the reason is that there is a difference. For example, the thickness of 10mm may actually be 9.6mm, and there will be a price difference in the middle.
The stainless steel plate is divided into hot rolling and cold rolling according to the different rolling process of the rolling mill (the rolling mill is the machine name of the rolling plate), and the hot rolling is usually marked as NO. To be bright, close to the mirror, the best is the mirror surface, the mirror surface is not in stock, it needs to be processed), for example, 304 is often purchased board, which means that the roll must be opened and flattened by the machine. It can be opened into different lengths by opening the leveling machine. If it is not a regular length, it is called a fixed opening, which means a fixed opening size, because customers often put forward different length requirements according to actual needs. At this time, the roll is important. The board can not meet the requirements.
Domestic cold-rolled sheets are generally below 3 mm, and hot-rolled sheets are generally above 3 mm. There are both hot-rolled and cold-rolled sheets with a thickness of 3 mm, but the thickness of imported cold-rolled sheets can reach below 4 mm or even below 6 mm. Hot-rolled plates from 3 mm to 12 mm are called medium plates, and those above 12 mm are called thick plates, which can be thicker than 120 mm, and are also called hot-rolled medium and heavy plates, while cold-rolled plates are cold-rolled thin plates.
