There are generally four methods to identify 304 stainless steel and 201 stainless steel:

1. Touch with your hands: If you observe it directly with the naked eye at close range, the color of 304 stainless steel is saturated and shiny, and it feels very smooth to the touch; while 201 stainless steel will be slightly dark, the color saturation is low, and there will be some staining when touched by the hand. A little rough feeling.

2. Look at the gloss: From a distance, the surfaces of 304 stainless steel plates and 201 stainless steel plates have the same luster and matte color. Only professionals who look closely will find subtle differences in the surfaces of 304 stainless steel and 201 stainless steel.

3. Water stain test: In the water stain test, the water marks on the 304 surface are very easy to remove, while the 201 treatment is more laborious.

4. Grinding machine: Distinguish by grinding machine: when grinding 304 stainless steel plates, the sparks are short and few; while for 201 stainless steel plates, on the contrary, sparks are scattered and abundant. When you use this method to distinguish, you must keep the polishing intensity consistent to avoid accidents.

5. Sampling inspection: The simple method is to use chemical solution electrolysis test. You can simply distinguish 304 stainless steel and 201 stainless steel according to their nickel content. This method is simple, fast, low-cost, but the accuracy is not high; in addition, with large spectrum, this can Quickly identify the chemical composition of stainless steel and compare the differences between 304 stainless steel and 201 stainless steel. The cost of the spectrometer is high. The most accurate is chemical testing, which can test its chemical composition by taking samples, and its mechanical properties can also be tested, and the values are accurate. However, the time is relatively slow and the operation is complicated, and it requires qualified professional institutions to test.