1. If you want to completely eliminate the magnetism of the 304 stainless steel plate, you can use high-temperature solid solution treatment (heating the alloy to a high-temperature single-phase zone and maintaining it at a constant temperature to fully dissolve the excess phase into the solid solution and then quickly cool it to obtain a supersaturated solid solution) Restore the stable austenite structure, thereby eliminating magnetism. Specific method: Heating the 304 stainless steel plate to about 1050°C and using cold water or quenching method will cause the carbides in the 304 stainless steel plate to produce carburization. This method is suitable for workpieces that require heat treatment and welded workpieces.
2. Apply an alternating attenuated magnetic field: You can demagnetize it with a DC welding machine that is turned on: Clamp one of the welding tongs on one end of the material, and then use another welding tong to clamp the opposite end of the 304 stainless steel plate, and the current Gradually reduce and can be done in multiple times; but the time cannot be too long and the number of times cannot be too many, otherwise the welding machine may be easily burned.

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