Simple classification of stainless steel has the following types: Stainless steel can be roughly divided into three categories: 200 series, 300 series and 400 series, among which 300 series is the most commonly used, 200 series and 400 series are alternatives to 300 series to a certain extent , And strictly speaking, the 400 series is not called stainless steel, but stainless iron, because it does not contain nickel, so it can be attracted by a magnet. The 200 series and 300 series have nickel, so they are not magnetic and cannot be absorbed by iron.
Because of the Simple classification of stainless steel, the effect of some elements is more obvious. 304 is the most common variety in the 300 series, so generally the price trend of the entire stainless steel can be judged from the price change of 304. The 200 series contains less nickel, the 400 series does not contain nickel, and the 300 series contains the most nickel. Therefore, the 300 series is most affected by the nickel price. This also shows that the characteristics of stainless steel are diverse.
The 300 series can be simply divided into 304, 304L, 316, 316L, 321, 309S, 310S, etc. The distinction is based on the content of various metal elements, the content is different, the Characteristics of stainless steel are also different, the difference between 304 and 304L It lies in the difference in carbon (C) content. The one with L means low carbon content, which is also called low carbon. The difference between 316 and 316L is also the same.
The form of stainless steel is classified into the following categories: 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. The form of stainless steel is different, so the thickness of the plate is also different.
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, all need to be processed), for example, 304 is often a purchase board. The characteristics of stainless steel and the form of stainless steel will also be affected. That means that the roll must be flattened into a plate form by a machine, which is a flattening machine.
Tags: simple classification of stainless steel, characteristics of stainless steel, the form of stainless steel
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