Magnetism of stainless steel

There are many kinds of stainless steel, which are usually divided into Austenitic stainless steel, Martensitic stainless steel and Ferritic stainless steel according to the matrix structure.           

Most common stainless steels are 200 series, 300 series and 400 series.           

200 series is Austenitic stainless steel, according to alloy composition can be called chromium nickel manganese stainless steel           

300 series is Austenitic stainless steel, according to alloy composition can be called chromium nickel stainless steel           

400 series is Ferritic and Martensitic stainless steel, which is called chromium stainless steel according to alloy composition.           

In the alloy composition, Chromium (CR) can produce magnetism. Nickel (Ni) can inhibit the formation of magnetism.          

The main alloy composition of austenitic stainless steel is Chromium and Nickel, which is nonmagnetic or weakly magnetic.

Martensitic, Ferritic stainless steel, the main alloy composition is chromium, no nickel, its composition is similar to carbon steel, which has magnetic.