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Silico Manganese Specifications
Si-Mn is a ferroalloy composed principally of manganese, silicon, and iron. It normally contains much smaller proportions of minor elements, such as carbon, phosphorus, and sulphur. The ferroalloy is also sometimes referred to as ferro-silicon-manganese. It is being used to add both silicon and manganese as ladle addition during steelmaking. Si-Mn is produced in a number of grades and sizes and is consumed in bulk form primarily in the production of steel as a source of both Si and Mn, although some Si-Mn is also used as an alloying agent in the production of iron castings. Because of its lower carbon content, it is a preferred ladle addition material during making of low carbon steels. Both manganese and silicon play an important role in the production of steel as deoxidizing, desulphurizing, and alloying agents. Si-Mn adds additional silicon in liquid steel which is a stronger deoxidizer and which also helps to improve some mechanical properties of steel.
Si-Mn with high content of manganese and silicon is produced by heating a mixture of oxides of manganese (MnO2) silicon (SiO2), and iron (Fe2O3) with carbon in a furnace. These oxides undergo a thermal decomposition reaction. The standard grade contains manganese in the range of 62 % to 68 %, silicon in the range of 12 % to 18 % and carbon in the range of around 2 %. The low carbon grade of Si- Mn has a carbon level of 0.1 % maximum. Si-Mn is more preferred ferroalloy by the steel melting shop operators for deoxidation. The steel industry is the only consumer of these alloys.
