Ferroboron is an alloy made from boron and iron which is used to metallurgical industry as additive for boron. Ferroboron can improve steel's quenching degree and mechanical behavior obviously. In high-quality alloy steel boron takes the place of chromium, molybdenum and nickel, and doesn't effect the mechanical behavior. Cast iron added 0.05 per cent boron can improve its wear resistance. With rare earth permanent magnetism industry development, the demand of ferroboron as one of neodymium-ferroboron permanent magnetism materials has increased quickly since 1982.