1, friction spark identification method: 304 material and 201 material, respectively, placed in the high-speed rotation of the sander to see the sparks generated, due to friction and high temperature, the number of sparks generated by the oxidation of various elemental particles, the shape of the fork and so on the different to identify the chemical composition of the material and the approximate content.
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2, stainless steel potion identification method: you can directly to the stainless steel accessories store (such as Jiangtou Prosperity, Xin Yongsheng) to buy, the unit price of 15 yuan a bottle. Stainless steel identification potion drops in 304 material and 201 material, two to three minutes can be differentiated, will show a different color, and then refer to the instructions for comparison. ?
The above two methods are the most simple and effective identification method.
The rest of the method is as follows:
3, surface observation, first look at the surface of the vessel whether there is rust, if there is no rust, can be determined to be stainless steel, but can not be concluded.
4, potion detection, the market sells material testing water, after dropping up, different colors correspond to different materials, it is very simple and very convenient, you can roughly determine which type of stainless steel material.
5, grinding detection, grinding wheel grinding to see the state of sparks, but this method requires experienced people to identify.
6, spectral detection, instrument identification of the safest and most accurate method. First, the surface with a grinding machine to beat off a layer, but the surface must ensure that the flat and then use the spectrum to fight, can read in detail the metal elements in the material, and then against the material, this method is the most reliable, but also the most authoritative.
304 stainless steel is a common material in stainless steel, density 7.93 (g/cm3), the industry is also called 18/8 stainless steel. High temperature resistance of 800 ℃, with good processing performance, high toughness, widely used in industrial and furniture decoration industry and food medical industry.
The common labeling methods in the market are 0Cr18Ni9, SUS304, of which 0Cr18Ni9 generally indicates that the national standard production, 304 generally indicates that the ASTM standard production, SUS 304 indicates that the Japanese standard production.
304 is a general-purpose stainless steel, which is widely used in the production of equipment and machine parts requiring good overall performance (corrosion resistance and molding). In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 18% chromium and more than 8% nickel. 304 stainless steel is a grade of stainless steel produced in accordance with the American ASTM standard.
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