Magnesium ferrosilicon is instrumental in the formation of nodules, which give?ductile iron?its flexible property. Unlike gray cast iron, which forms?graphite?flakes, ductile iron contains graphite nodules, or pores, which make cracking more difficult.
Ferrosilicon is also used in a ratio of 3–3.5% in the manufacture of sheets for the magnetic circuit of?electrical transformers.
Ferrosilicon is also used in the?Pidgeon process?to make magnesium from?dolomite. Treatment of high-silicon ferrosilicon with?hydrogen chloride?is the basis of the industrial synthesis of?trichlorosilane.