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Why is 304 # steel wire magnetic? People often think that magnets absorb stainless steel, verify its pros and cons and authenticity, do not attract non-magnetic, think it is good, genuine goods; if the sucker has magnetism, it is considered a fake. In fact, this is an extremely one-sided and impractical method of identifying errors. There are many types of stainless steel, which can be divided into several types according to the structure at room temperature: 1. Austenitic type: such as 304, 321, 316, 310, etc .; 2. Martensitic or ferritic type: such as 430, 420, 410, etc. The austenite type is non-magnetic or weakly magnetic, and martensite or ferrite is magnetic. Most of the stainless steel commonly used for decorative tube plates is austenitic 304 material, which is generally non-magnetic or weakly magnetic, but it may also appear magnetic due to chemical composition fluctuations or different processing conditions caused by smelting, but this cannot be considered as What is the reason for counterfeiting or disqualification? As mentioned above, austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to component segregation or improper heat treatment during smelting, a small amount of martensite or ferrite in austenitic 304 stainless steel will be caused. Body tissue. In this way, 304 stainless steel will have weak magnetism. In addition, 304 stainless steel undergoes cold working, and the structure will also be transformed to martensite. The greater the degree of cold working deformation, the more martensite transformation, and the greater the magnetic properties of the steel. Like a batch of steel strips, Φ76 tubes are produced without obvious magnetic induction, and Φ9.5 tubes are produced. Due to the large bending deformation, the magnetic induction is obvious. Due to the larger amount of deformation in the production of rectangular tubes than round tubes, especially the corners, the deformation is more intense and the magnetic is more obvious. In order to completely eliminate the magnetic properties of 304 steel caused by the above reasons, a stable austenite structure can be restored by high-temperature solid solution treatment, thereby eliminating magnetic properties. In particular, the magnetic properties of 304 stainless steel due to the above reasons are completely different from those of other materials such as 430 and carbon steel, which means that the magnetic properties of 304 steel always show weak magnetism. This tells us that if stainless steel is weakly magnetic or completely non-magnetic, it should be judged as 304 or 316; if it is as magnetic as carbon steel, it shows strong magnetism because it is judged not to be 304. At the same time, in terms of chemical composition, nickel is used as an indicator of its weight. 304 # and 316 # contain more than 8% nickel. Because nickel is as magnetic as iron, it also has a weak magnetic condition. Therefore, please rest assured that all 304 # steel wires produced by our company are national standard products, and all the products have been inspected by the inspection department. Please rest assured to use them. At the same time, you can use the company's potion or other methods for inspection and comparison. doubt!
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