Segregation or improper heat treatment during smelting may result in a little of martensite or ferrite structure in the austenitic 304 stainless steel wire mesh. Thus, 304 stainless steel will have weak magnetic properties.
If want to eliminate the magnetic properties of 304 stainless steel caused by the above reasons, you can restore the stable austenite structure by high temperature treatment to eliminate the magnetic properties.
In addition, after cold-worked, the microstructure of 304 stainless steel is also transformed into martensite. The greater the cold work deformation, the more martensite transformation and the greater the magnetic properties of the steel.
Besides, stainless steel 304 is weakly magnetic due to friction during use.
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