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Ferrosilicon is an iron alloy composed of iron and silicon. Ferrosilicon is an iron-silicon alloy made of coke, steel scraps, quartz (or silica) as raw materials and smelted in an electric furnace.
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 Grade | Chemical Composition (mass fraction)% | |||||||
Si | Al | Ca | Mn | Cr | P | S | C | |
≥ | ≤ | |||||||
FeSi90Al1.5 | 87.0~95.0 | 1.5 | 1.5 | 0.4 | 0.2 | 0.04 | 0.02 | 0.2 |
FeSi9oAI3.0 | 87.0~95.0 | 3 | 1.5 | o.4 | o.2 | 0.04 | 0.02 | 0.2 |
FeSi75AI0.5-A | 74.0~80.0 | 0.5 | 1 | o.4 | l0.3 | 0.035 | 0.02 | 0.1 |
FeSi75AI0.5-B | 72.0~80.0 | 0.5 | 1 | 0.5 | 0.5 | 0.04 | 0.02 | 0.2 |
FeSi75Al1.0-A | 74.0～80.0 | 1 | 1 | 0.4 | 0.3 | 0.035 | 0.02 | 0.1 |
FeSi75Al1.0-B | 72.0~80.0 | 1 | 1 | 0.5 | 0.5 | 0.04 | 0.02 | 0.2 |
FeSi75AI1.5-A | 74.0~80.0 | 1.5 | 1 | 0.4 | 0.3 | 0.035 | 0.02 | 0.1 |
FeSi75Al1.5-B | 72.0~80.0 | 1.5 | 1 | 0.5 | 0.5 | 0.04 | 0.02 | 0.2 |
FeSi75Al2.0-A | 74.0~80.0 | 2 | 1 | 0.4 | 0.3 | 0.035 | 0.02 | 0.1 |
FeSi75AI2.0-B | 72.0~80.0 | 2 | — | 0.5 | 0.5 | 0.04 | 0.02 | 0.2 |
FeSi75-A | 74.0~80.0 | — | — | 0.4 | 0.3 | 0.035 | 0.02 | 0.1 |
FeSi75-B | 72.0~80.0 | — | — | 0.5 | 0.5 | 0.04 | 0.02 | 0.2 |
FeSi65 | 65.0~72.0 | — | — | 0.6 | 0.5 | 0.04 | 0.02 | — |
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Application of Ferrosilicon
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Used as deoxidizer and alloying agent in steelmaking industry. In order to obtain steel with qualified chemical composition and ensure the quality of steel, deoxidation must be carried out. The chemical affinity between silicon and oxygen is very large, so ferrosilicon is a strong deoxidizer in steelmaking for precipitation and diffusion deoxidation. Improving the shape of inclusions and reducing the content of gas elements in molten steel is an effective new technology to improve steel quality, reduce costs and save iron. It is especially suitable for continuous casting molten steel deoxidation requirements. Practice has proved that ferrosilicon not only meets the deoxidation requirements of steelmaking, but also has desulfurization performance and has the advantages of large specific gravity and strong penetration.
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It is used as an inoculant and a nodularizing agent in the cast iron industry. Cast iron is an important metal material in modern industry. It is cheaper than steel, easy to melt and smelt, has excellent casting properties and much better shock resistance than steel. In particular, ductile iron, its mechanical properties are at or close to those of steel. Adding a certain amount of ferrosilicon to cast iron can prevent the formation of carbides in iron and promote the precipitation and spheroidization of graphite. Therefore, in the production of ductile iron, ferrosilicon is an important inoculant and spheroidizer.
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It is used as a reducing agent in the production of ferroalloys. Not only is the chemical affinity between silicon and oxygen high, but the carbon content of high-silicon ferrosilicon is very low. Therefore, high-silicon ferrosilicon (or siliceous alloy) is a commonly used reducing agent in the production of low-carbon ferroalloys in the ferroalloy industry.
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