Knowledge Of Stainless Steel

Stainless steel is a kind of high alloy steel that can resist corrosion. It has a beautiful surface and does not need to undergo surface treatment such as color plating or paint. Therefore, many machinery plants often do not do any paint treatment to show that they are stainless steel, while the black material (the so-called black material is the name of general steel and iron) must undergo rust prevention treatment.

Rust steel can be roughly divided into three categories: 200 series, 300 series and 400 series, of which 300 series is the most commonly used, and 200 series and 400 series are to some extent the substitutes of 300 series. Strictly speaking, 400 series is not called stainless steel, but stainless iron, because it contains no nickel element, so the magnet can be used to attract. The 200 series and 300 series have nickel, so they have no magnetism and can't absorb iron.

304 is the most common variety in the 300 series, so the price trend of the whole 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, so the 300 series is most affected by the nickel price.

The 300 series can be simply divided into 304, 304L, 316, 316L, 321, 309S, 310S and so on. The basis of differentiation is the different content of various metal elements, and the characteristics of stainless steel with different content are also different. The difference between 304 and 304L is the difference in carbon (C) content. The one with L indicates low carbon content, also called low carbon, and the difference between 316 and 316L is the same.