How to distinguish between 304 and 201？

1.The chemical formula of 201 is 1Cr17Mn6Ni5, and the chemical formula of 304 is 06Cr19Ni10. The main difference between them is nickel and chromium, 304 is 19 chromium and 10 nickel, while 201 is 17 chromium and 5 nickel

2.201 stainless steel contains manganese, but 304 does not. In terms of color, 201 stainless steel because the manganese will be darker than 304, and 304 will be whiter, but that's not something that can be easily distinguished by the naked eye

3.Because the content of nickel is different, the corrosion resistance of 201 is not as good as that of 304. Acid-base energy 201 is not as good as 304; Because the carbon content of 201 is higher than 304, so 201 is harder and brittle than 304, and the toughness of 304 is better. The scratch on 304 will not be obvious when the surface of 201 is scratched with a hard cutter

4.Because 201 contains manganese, it will rust in humid and salty air for a long time, while 304 will not rust

5.Spectrometer detection method, which is the fastest and most accurate method, but the price of spectrometer is very expensive, and generally individuals will not buy a spectrometer to test for the purchase of materials. If the material is very important and the content of the elements is very high then you can go to a special testing company, and they usually have spectrometers