Fe-Cr-Co permanent magnet alloys containing silicon

The magnetic properties of Fe-Cr-Co alloys as a function of the additional silicon content was studied. It was found that the magnetic properties depend on the compositions of the alloys and the best properties were obtained with an alloy of Fe-28wt%Cr-23wt%Co-1wt%Si. The energy product of this alloy attains 5.3 MGOe when it is step-tempered at low temperatures.