Other Si bearing deoxidizers are calcium (Ca) silicon, calcium barium silicon, calcium barium silicon aluminum, calcium manganese silicon, silicon carbide and ferrosilicon zirconium.įe -Si and Si-Mn are usually available in lump or granular form. Si – Mn is more preferred ferroalloy for deoxidation of liquid steel during steel making. The low C grade of Si – Mn has a C level of 0.1 % maximum. The standard grade contains Mn in the range of 62 % to 68 %, Si in the range of 12 % to 18 % and C in the range of around 2.0 %. These oxides undergo a thermal decomposition reaction. It is produced by heating a mixture of oxides of MnO2, SiO2 and Fe2O3 with C in a furnace. Si – Mn is a ferroalloy with high content of Mn and Si. Fe- Si is made in the submerged arc furnace. It is produced by reduction of quartzite (SiO2) with coke in presence of iron ore. The standard grade of Fe- Si contains Al up to 2 % while the low Al grade has Al content of 0.5 % maximum. These are standard grade, low Al grade, low C grade, and high purity grade having low content of titanium (Ti). Fe – Si is usually produced in four grades. Fe – Si contains 65 % to 90 % of Si and minor amounts of Fe, aluminum (Al) and carbon (C). Ferrosilicon (Fe-Si) and silico manganese (Si- Mn) are by far the most common addition agents.įe-Si is a ferroalloy of iron (Fe) and Si. There are many Si containing addition agents which are used in steel making. Si is present in all the types of steels either as an intentional addition or as a residual from the ore, scrap or deoxidizing agents. The phase diagram of the Fe-Si binary system is at Fig 1. Melting point of Si is 1412 deg C and boiling point is 2355 deg C. Silicon (Si) (atomic number 14 and atomic weight 28.09) has density of 2.34 gm/cc. deoxidation, Electrical steels, Fe-Si, Ferro alloys, Si-Mn, silicon, steels ,.
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