There are so many series of stainless steel products, which must be divided into 369 grades. If the stainless steel shopping mall is so large and profitable, it will inevitably lead to the change of pillars. If the bad people near the masses give us a second best, then we good people who are sincere will not lose the big. Good people should learn to fight against lawbreakers in a scientific way. How can we distinguish the truth from the falsehood of stainless steel. Today's editor teaches us the fundamental way to distinguish. Take various pipe types for stainless steel railings as examples. Now, the most commonly used way of changing jobs is to replace 304 with 201 and 316 with 304. Generally, we will hear that it is a one-sided way to test stainless steel with a magnet. If you don't, you will think it's real. If you do, you will think it's fake. To answer this question, we need to understand several terms: austenite, martensite, ferrite. If it's very professional or not, we just need to remember that austenite is not magnetic or weakly magnetic. However, 304316 belongs to austenitic stainless steel, and others are magnetic. The principle of detecting stainless steel with magnet comes from this. However, 410, 420 and 430 are all attributed to martensite or ferrite. It's hard to see that. After cold deformation treatment, the crystal phase of austenitic stainless steel will change and become magnetic. If we want to restore austenite crystal phase, we need quenching process. Magnetic attraction identification method is not completely scientific, but it can be used as a preliminary judgment of 304 and 316. There are also stainless steel testing reagents tested, but can not accurately distinguish types. In order to get a certain type of stainless steel, a professional testing agency is the most accurate and reliable.