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Why do stainless steel pipes also have magnetic properties
The reason why stainless steel is magnetic is that most stainless steel contains martensite, austenite or iron elements. Martensite or iron elements will exhibit magnetism, so some stainless steel will be magnetic. While austenite does not exhibit magnetism. This is why some stainless steel shows magnetism while others do not.
As mentioned above, austenite is either non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to component segregation during smelting or forging, or improper heat treatment, austenite 304 stainless steel may contain a small amount of martensite or ferrite structure. Thus, 304 stainless steel will have a weak magnetic property. Additionally, 304 stainless steel undergoes cold processing, and its structure will transform into martensite. The greater the degree of cold processing deformation, the more martensite will transform, and the greater the magnetic property of the steel. Just like a batch of steel strips, when producing 6-centimeter diameter steel pipes, there is no obvious magnetic effect. When producing 2-centimeter diameter steel pipes, due to the large cold bending deformation, the magnetic effect becomes more obvious. When producing rectangular pipes, the deformation is greater than that of round pipes, especially the folded part, the deformation is more intense and the magnetic property is more obvious. The same principle applies. The originally non-magnetic 304 stainless steel plate, during the cold stretching process for making sinks, will generate magnetism. The position where magnetism is most obvious in the sink is the folded part, which is also the part with the greatest deformation.
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