During the smelting or forging process, the composition segregation or improper heat treatment will lead to a small amount of martensite or ferrite structure in the 304 stainless steel plate. Therefore, the 304 stainless steel plate will have weak magnetic properties. In addition, the microstructure of 304 stainless steel plate will also be transformed into martensitic stainless steel after cold working. The greater the degree of cold working deformation, the more martensitic transformation of 304 stainless steel, and the greater the magnetic properties.
To completely eliminate the magnetism of 304 stainless steel plate, it can be recovered by high-temperature solution treatment (heating the alloy to a high-temperature single-phase region for constant temperature maintenance, so that the excess phase is fully dissolved into the solid solution and then rapidly cooled to obtain a supersaturated solid solution. Heat treatment process) Stabilizes the austenite structure, thereby eliminating magnetism.
Specific method: heat the 304 stainless steel plate to about 1050 ℃, and use cold water to quench the carbides in the 304 stainless steel plate to produce carburization. This method is suitable for workpieces after heat treatment and workpieces after welding.
Apply an alternating decaying magnetic field: demagnetize it with a DC welding machine that is turned on: clamp one of the welding tongs of the welding machine to one end of the material, and then use another welding tong to clamp the other end of the diagonal of the 304 stainless steel plate, and the current gradually increases. Reduced, and can be divided into multiple times; but the time should not be too long, the number of times should not be too many, otherwise it will easily burn the welding machine.
Just like you, 70% customers choose long-term cooperation with BBN steel not only for our good product and service quality, good reputation in the international market, but also for our experienced one-stop raw material supply and further steel processing!
