Do You Know How to Identify 201 and 304 Stainless Steel Sheet?

It is difficult for people engaged in building materials to distinguish between 201 and 304 stainless steel sheet. In particular, some bad businessmen use 201 materials to sell 304 materials to customers. This not only causes customers to suffer losses but also disrupts market order, and more serious may occur. Danger, here's how to distinguish between 201 and 304 stainless steel plates:

The chemical formula of 1,201 is 1Cr17Mn6Ni5, and the chemical formula of 304 is 06Cr19Ni10; the main difference between them is nickel-chromium element, 304 is 18 chromium and 8 nickel, and 201 is 0.8 nickel.
2,201 stainless steel contains manganese, but 304 does not; color, 201 stainless steel because manganese color will be darker than 304, 304 is white, but this is not easily distinguishable by the naked eye.
3, because of the different nickel content, 201 corrosion resistance is far less than 304; acid and alkali resistance 201 is not as good as 304; because 201 carbon content is higher than 304, so 201 is more rigid than 304, 304 toughness Better, scratching the surface of 201 with a hard knife will generally have obvious scratches, scratches on 304 will not be obvious
4, because 201 contains manganese, it will rust in the humid and high salt air for a long time, and 304 will not rust; but many people say that 304 is rusted, it may not be 304 at all, do not look at the material printed There are 304 marks
5, there is now a stainless steel test syrup on the market, as long as a few drops can be used to distinguish the stainless steel in a few seconds, this syrup is particularly convenient, the principle is to make the elements contained in the material and identify the substance in the syrup The chemical reaction produces colored substances. This method is very convenient and accurate and feasible. At present, this identification syrup can be purchased online, which is difficult to buy on the market.
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Anna H.//SMC Editor