Why are the 304 stainless steel wires magnetic? And the thinner the wire, the greater the magnetism
However, due to segregation or improper heat treatment during smelting, there will be a small amount of martensite or ferrite in Austenitic 304 stainless steel. In this way, 304 stainless steel will have a weak magnetic.
Generally speaking, stainless steel has magnetism and also has no magnetism. The austenite is nonmagnetic or weakly magnetic, such as 201, 202, 304, 316, etc. the martensite or ferrite is magnetic, such as 430, 420, 410, etc..
In addition, 304 stainless steel after cold processing, the structure of the structure will also change to martensite, and the greater the deformation degree of cold work, the more martensite transformation, the greater the magnetism. Like a lot of stainless steel wire, made straight, no obvious induction, but it is bent into a rectangular or circular, and produce some magnetic for cold bending deformation is large, especially the angle of magnetic is more obvious.
