1. Definition 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 surface treatment such as color plating or painting. Therefore, many machinery factories often do not do any paint treatment to show that they are stainless steel, while black materials ( The so-called black material (which is the name of general steel) must be rust-proofed. Stainless steel is the most commonly used one.
2. Simple classification of stainless steel
Stainless steel can be roughly divided into three categories: 200 series, 300 series and 400 series.
Among them, the 300 series is the most commonly used. The 200 series and the 400 series are to a certain extent substitutes for the 300 series. Strictly speaking, the 400 series is not called stainless steel, but stainless steel. Because it does not contain nickel, it can be attracted by magnets. live.
The 200 series and 300 series are made of nickel, so they are non-magnetic and cannot be attracted by iron.
304 is the most common variety in the 300 series, so the price trend of the entire stainless steel can generally be judged from the price changes of 304.
The 200 series contains less nickel, the 400 series contains no nickel, and the 300 series contains the most nickel, so the 300 series is most affected by nickel prices.
The 300 series can be simply divided into 304, 304L, 316, 316L, 321, 309S, 310S, etc. The distinction is based on the different contents of various metal elements. The characteristics of stainless steel with different contents are also different, which lies in the carbon (C) content. The difference is that the one with L means low carbon content, also called low carbon, the same is true.
