People often use stainless steel to absorb the stainless steel to verify the strength and inferiority of the 304 stainless steel plate. The 304 stainless steel plate does not absorb non-magnetic and is considered to be good. On the contrary, it is considered a counterfeit fake. In fact, this is an unrealistic method of identification. There are many kinds of stainless steel, which can be divided into austenite type and martensite type or ferrite type according to the structure at room temperature. 304 stainless steel plate, austenitic type is non-magnetic or weak magnetic, martensitic or ferrite type is magnetic. However, this is not necessarily the case. For example, the austenitic 304 stainless steel plate material normally used for decoration pipes is generally non-magnetic. However, due to chemical composition fluctuations or processing conditions due to smelting, magnetic properties may also occur, which cannot be considered as a counterfeit or a failure. In addition, the 304 stainless steel plate is cold-worked, and the microstructure is also transformed into Markov. The greater the degree of cold work deformation, the more the martensite transformation, the greater the magnetic properties of the steel. On the contrary, the 200-series stainless steel of the second-class quality is likely to not With magnetic. It is a mistake to judge that it is a genuine stainless steel.