Ferrosilicon nitride (Fe-Si3N4) is a new synthetic raw material that has appeared in recent years. It is prepared from FeSi75 iron alloy and Si3N4 as the main component, using nitriding technology and high-temperature synthesis technology. Granular ferrosilicon nitride is mainly used in grain-oriented silicon steel or other steel types that use nitrides to improve strength. Ferrosilicon nitride for refractory materials is a gray-white (or brown) powder, and ferrosilicon nitride for steel-making is gray-white granular material.
Powdered ferrosilicon nitride is mainly used in the plugging mud of large blast furnaces. Due to the small thermal expansion coefficient, high hardness, high elastic modulus and good thermal stability of nitride, it cannot completely wet with slag and iron. . Adding ferrosilicon nitride to the blast furnace gun mud can not only ensure easy drilling in the early stage, but also ensure the resistance to the erosion of molten iron at high temperatures, which can extend the tapping time. A small amount of it is used in trench materials or other amorphous refractory materials.
Granular ferrosilicon nitride was initially used in the production of grain-oriented silicon steel. It can replenish a certain amount of nitrogen to molten steel relatively stably. The advancement of smelting technology has led to the rapid development of high-strength microalloyed steel production in my country. The main strengthening microalloying elements of steel .There are vanadium, niobium and titanium. After calculation, comparison and practical application in production, the FeV50+Fe Si3N4 micro-alloying solution is used to produce HRB400 steel bars. The alloying cost is 127.61 yuan lower than the cost of using FeV50 tons of steel alone, and is 127.61 yuan lower than the cost of using VN12 micro-alloyed tons of steel. The cost is reduced by 44.21 yuan. If this technology is popularized, it will be of great significance to cost reduction and efficiency improvement for manufacturing companies that produce construction steel.
Ferrosilicon nitride, as a cheap alloy that provides nitrogen source, has good prospects for application in other steel types in the future.
