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How to distinguish 304 stainless steel from 201 stainless steel, can you use a magnet?

304 stainless steel and 201 stainless steel are indistinguishable from magnets.

The price of 304 stainless steel is much higher than the price of 201, and some people will charge it shoddy. The easiest and most direct way is to use a handheld spectrometer, hit the spectrum, and see the nickel content to understand. The nickel content of 304 stainless steel is 8%. The nickel content of 201 is generally about 1% or even lower.

There is also a simple method to use chemical potion electrolysis test, which can simply distinguish 304 and 201 according to their nickel content. This method is simple and fast, and the cost is low, but the accuracy is not high;

The most accurate is the chemical test, which can be tested for its chemical composition by sampling, and its mechanical properties can also be tested, and the values ​​are accurate. However, the time is relatively slow, the operation is complicated, and a qualified professional organization is required to test.

201 stainless steel is easy to rust: 201 stainless steel contains high manganese, while the nickel content is very low, the surface is very bright with dark and bright, and the high manganese content is easy to rust.

304 stainless steel is 1.6 times more expensive than 201: 304 stainless steel contains 18 chromium and 8 nickel, while 201 stainless steel has only 12 chromium and about 1 nickel. The rust prevention and cost of stainless steel are related to chromium and nickel, so the price of high-quality 304 stainless steel is much higher than that of 201.



Post time: Sep-06-2022