201 stainless steel in circulation on the market, nickel content from 0.5-5 nickel, according to the requirements of the composition of a larger difference. Steel 201 contains manganese, which rusts in humid, high-salt air over long periods of time. Because the manganese element relations will be darker than the 304 steel grade, but on the naked eye is more difficult to distinguish. Because of the different nickel content, the corrosion resistance of 201 is not as good as that of 304, and the higher carbon content makes 201 stainless steel harder and more brittle than 304.  This type of steel is mainly used to replace 304 stainless steel in some specific applications.The more common 201 stainless steel products on the market are steel tubes (including square tubes and round tubes) , steel plates, steel bars, steel coil, steel strip and steel wire. This type of steel is mainly used in high temperature applications, except for a few used in industry, the vast majority of civil applications, such as architectural decorative pipes and some shallow tensile products.