1, austenitic body size: such as 304, 321, 316, 310, etc.
2, martensite or ferrite body size: 430, 420, 410, etc.
Austenitic type is non-magnetic or weak magnetic, martensite or ferrite is magnetic.
Usually used as decorative tube sheet stainless steel wire mesh is mostly austenitic 304 material, generally non-magnetic or weak magnetic, but because of smelting chemical composition fluctuation or processing state may also be magnetic, but this can not be considered counterfeit or unqualified, what is the reason?
The above mentioned austenite is non-magnetic or weak magnetic, and martensite or ferrite is magnetic, due to the smelting process of segregation or improper heat treatment, will cause austenite 304 stainless steel wire mesh small number of martensite or ferrite tissue. In this way, 304 stainless steel wire mesh will have a faint magnetism.
In addition, 304 stainless steel wire mesh after cold processing, the organizational structure will be converted to martensite, cold processing deformation, the greater the martensite transformation, the more magnetic steel. Like a number of steel strips, production φ 76 tubes, no apparent magnetic sense, production φ 9.5 tubes. Because of the greater magnetic sense of the deformation of the cold bending, the production side of the rectangular tube due to the deformation of larger than circular tube, especially the corner part, more intense magnetic deformation.
To completely eliminate the above-mentioned causes of the 304 of the magnetic steel, can be treated by high temperature solution to the restoration of stable austenite, thus eliminating magnetism.