Stainless steel, usually used as a decorative tube plate, is mostly an austenitic 304 material, generally non-magnetic or weak magnetic, but due to smelting caused by fluctuations in chemical composition or different processing State may also appear magnetic.
304 stainless steel after cold processing, the tissue structure will also be converted to martensite, the greater the deformation of cold processing, the more martensite conversion, the greater the magnetism of steel. Like a batch of steel strip, the production of φ76 tube, no obvious magnetic sense, the production of φ9.5 tube.Because of the large magnetic sense of the corner deformation is obvious, the production square rectangular tube because the deformation is larger than the circular tube, especially the folding part, deformation more intense magnetism is more obvious.
In order to completely eliminate the magnetic properties of 304 steel caused by the above reasons, the stable austenitic tissue can be restored by high temperature solidification treatment, thus eliminating magnetism.
In particular, due to the above reasons caused by the 304 stainless steel magnetism, and other materials of stainless steel, such as 430, carbon steel magnetism is not the same level at all, that is, 304 steel magnetism always shows weak magnetism.