There are a lot of methods to distinguish 304 stainless steel and 201 stainless steel.
201 stainless steel constitute 17Cr-4.5Ni-6Mn-N, which saves Ni and is an alternative steel for 301 steel. 201 stainless steel is magnetic after cold working and used in railway vehicles.
304 stainless steel constitute 18Cr-9Ni, which is the most widely used stainless steel and heat resistant steel. 304 stainless steel is used for food production equipment, chemical equipment, nuclear energy and so on.
201 stainless steel has high manganese content, the surface is bright with dark, and easy to rust. 304 stainless steel contains more chromium, and the surface is matte. Stainless steel is not easy to rust because the formation of chromium-rich oxides on the surface of the steel can protect the steel, so 304 stainless steel is not rust.
The most important thing is the different corrosion resistance, the corrosion resistance of 201 stainless steel is very poor, and because 201 stainless steel contains low nickel, so the price of 201 stainless steel is lower than 304, and its corrosion resistance is not as good as 304 stainless steel.
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