Austenitic stainless steel (201, 202, 301, 304, 316) is non-magnetic or weakly magnetic, martensitic or ferritic stainless steel (430, 420, 410) is magnetic.
Most of the stainless steel usually used as decorative pipe plate is austenitic, generally speaking, is non-magnetic or weakly magnetic, due to smelting composition bias or improper heat treatment, will cause austenitic 304 stainless steel has a small amount of martensite or ferrite organization, 304 stainless steel will be weakly magnetic.
In addition, 304 stainless steel after cold processing, the organizational structure will also be transformed to martensite, the greater the degree of cold processing deformation, the more martensite transformation, the greater the magnetic properties of steel. Such as the same batch number of steel strip, the production of square rectangular tube due to deformation than the round tube, especially the folded part, the magnetic properties are more obvious.
