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Type classification of stainless steel.
Type classification of stainless steel.

 

Type classification of stainless steel.

 

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, including 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 plate are actually the same, and the factory form is different. The coil is rolled one by one, and the plate is one by one. If the plate is shipped from the factory, it is also called the original plate. It is generally a thick plate because it is very thick. If it is, it cannot be rolled, generally it cannot be rolled if it is more than 16 mm.

 

There are coils and plates. In many cases they are plates. The prices of coils and plates are also different. If it is a purchased coil, it is calculated according to the actual weight. Therefore, the price is high. The plate is calculated according to the theory, and the price is low. , The reason is that there is a drop, such as 10mm thick may actually be 9.6mm, there will be a price difference in the middle.

 

Stainless steel plates are divided into hot rolling and cold rolling according to the different rolling processes of the rolling mill (the rolling mill is the machine name of the rolled plate). Hot rolling is usually marked as NO. 1 and cold rolled is marked as 2B or BA (BA has a better surface than 2B, To be bright, close to the mirror, the best is the mirror surface. The mirror surface is not in stock and needs to be processed). For example, 304 is often a purchased board, which means that the roll must be flattened by a machine. This kind of machine is a flattening machine. It can be opened into different lengths by 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 ask for different length requirements according to actual needs, this time the roll becomes important. The conventional The board cannot meet the requirements.

 

Domestic cold rolling is generally below 3 mm, and hot rolling is generally above 3 mm. The thickness of 3 mm is both hot rolled and cold rolled, but the thickness of imported cold rolled plates can reach 4 mm or even 6 mm. Hot-rolled plates of 3 mm to 12 mm are called medium plates, and those of 12 mm or more are called thick plates, which can be thicker than 120 mm, and are called hot-rolled medium-thick plates, while cold-rolled plates are cold-rolled sheets.

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