1. Due to improper segregation or heat treatment during smelting, there will be some Martensite or Ferrite in Austenite, as Martensite and Ferrite is magnetic, so weak magnetic properties will occur.
2. During the cold working process, the microstructure will also transform into Martensite. The greater the degree of cold work deformation, the more Martensite transformation, then the greater the magnetism.
3. When the production process or the use of mesh, it will produce some magnetism due to friction.
So the non-magnetic requirements are difficult to achieve.
If you'd like to completely eliminate the magnetic properties of the 304 steel mesh caused by the above reasons, the austenite structure can be restored by high-temperature solution treatment, then to eliminate the magnetic properties.
In particular, the magnetic properties of the 304 stainless steel mesh caused by the above reasons are not at the same level as the magnetic properties of other materials such as 430 and carbon steel. That is to say, the magnetic properties of 304 steel always show weak magnetic properties.
It means that if the stainless steel mesh is weakly magnetic or not magnetic at all, it should be judged as 304 stainless steel mesh or 316 stainless steel mesh; if it is magnetic similar to carbon steel, and shows strong magnetism, it can be judged not to be 304 material.
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