We have studied free-machining magnetic core stainless steel on the basis of our experience of free-machining core iron.
We confirmed as follows:
(1) In 13 Cr stainless steel with less than 0.03% carbon and adequate amount of silicon we can obtain the best magnetic property as coercive force (Hc) is about 1.5 (Oe).
(2) Addition of lead can make machinability better and both magnetic properties and corrosion strength have not been damaged.