How to identify 304 stainless steel

Use 304 material and 202 material respectively, and put them on a high-speed rotating grinder to see the sparks generated. Due to the high temperature of friction, the number and shape of sparks generated when various element particles are oxidized are different to identify the chemical composition and approximate content of the material.

2. Identification method of stainless steel potion
You can go to stainless steel accessories stores (such as Jiangtou Fansheng, Xin Yongsheng) to buy, the unit price is 15 yuan a bottle. Put the stainless steel identification potion on different materials, and it can be distinguished in two to three minutes, and different colors will be displayed, and then compared with the instructions.
3. Surface observation
First of all, check whether there is rust on the surface. If there is no rust, it can be determined that it is stainless steel, but it cannot be judged by this.
4. Potion detection
There is material testing water on the market. After dripping on it, different colors correspond to different materials. It is very simple and convenient, and you can roughly judge which type of stainless steel material it is.
5. Grinding inspection
Grinding the grinding wheel to see the state of the sparks, this method needs to be identified by experienced people.
6. Spectral detection
Instrument identification is the safest and most accurate method. First remove a layer of the surface with a grinder, but the surface must be smooth and then polished with a spectrum, which can read the metal elements in the material in detail, and then compare the material. This method is the most reliable and authoritative.