Stainless Steel Definition
Stainless steel is a kind of high alloy steel that can resist corrosion. Has a beautiful surface, do not have to go through the surface treatment such as colour plating or paint, so many machinery factories to show that their own is stainless steel, often without any paint treatment, while the black material (the so-called black material is the name of the general steel) is necessary to carry out anti-rust treatment.
Simple classification of stainless steel
Stainless steel can be roughly divided into 200 series, 300 series and 400 series of three categories, of which the 300 series is the most commonly used, 200 series and 400 series to a certain extent is the 300 series of alternatives, and strictly speaking 400 series is not called stainless steel, called stainless steel, because it does not contain nickel elements, so with a magnet can attract. The 200 series and 300 series are nickel, so it is not magnetic, suction iron can not suck.
304 is the most common varieties of 300 series, so generally from the price change of 304 can judge the price trend of the whole stainless steel. 200 series contains less nickel, 400 series does not contain nickel, 300 series contains the most nickel, so by the price of nickel is the most affected by the 300 series.
300 series can be briefly divided into 304, 304L, 316, 316L, 321, 309S, 310S, etc., the distinction is based on the content of various metal elements, the content of different stainless steel characteristics are not the same, 304 and 304L is the difference between the carbon (C) content of the different, with the L is said to be low in carbon, also known as low carbon, 316 and 316L is the difference is the same. The difference between 316 and 316L is also the same.
Stainless steel form classification
Stainless steel can be divided into coils, plates, profiles, tubes and parts of five categories, the most important is the volume and plate. Profiles are a variety of different shapes of materials made of plate, with angles, flat steel, I-beams, channels. Pipe mainly refers to seamless steel pipe, and seamless steel pipe is the opposite of welded pipe, the difference is whether the one-time moulding. Components are mainly elbows and flanges and other small things.
Coil and plate is actually the same, the factory form is not the same, coil is a roll of a roll, plate is a sheet of a sheet, if the factory is plate, also known as the original plate, generally thick plate, because it is very thick, it is not able to be rolled, generally 16 mm or more can not be rolled.
There are rolls, there are plates, many times it is the plate, volume and plate prices are not the same, if the procurement volume, is calculated according to the actual weighing, so the price is high, the plate is calculated in accordance with the theory, the price is low, the reason is that there is a difference between the lower, such as 10mm thick actual may be 9.6mm, which will have a price difference in the middle.
Stainless steel plate according to the mill (mill is the name of the machine rolling plate) rolling process, divided into hot-rolled and cold-rolled, hot-rolled usually marked as NO.1 cold-rolled marked as 2B or BA (BA is better than the surface of the 2B, to be bright, close to the mirror, the best is the mirror, the mirror surface is not in stock, all need to be processed), for example, 304 many times is purchased plate, that means that the volume must be levelled by the machine into the form of the plate This machine is the levelling machine. Through the levelling machine levelling can be opened into different lengths, if not the conventional length is called fixed open, meaning that the fixed open size, because customers according to the actual need, often put forward different length requirements, this time the volume appears to be important, the conventional plate can not meet the requirements.
Domestic cold-rolled generally below 3 mm, hot-rolled generally above 3 mm, 3 mm thickness of both hot-rolled and cold-rolled, but the thickness of imported cold-rolled plate can be up to 4 mm or even 6 mm below. Hot rolled 3 mm to 12 mm plate is called medium plate, more than 12 mm is called thick plate, can be thicker than 120 mm, and called hot rolled medium thick plate, and cold rolled is cold rolled thin plate.
Theoretical weight of stainless steel plate simple calculation method
Plate weight = specific gravity × thickness (mm) × width (m) × length (m) (mm is the unit of millimetres, m is the unit of metres)
In the field of construction machinery due to the precision of the size, the world has adopted mm as the unit 1000 mm = 1 metre, 1 mm = 100 wire.
According to this formula the weight is kilograms (KG), to be accurate to two decimal places, because stainless steel is expensive, the transaction volume is large, the number after the decimal point is also very important, so the money should also be accurate to two decimal places.
