Ferromanganese, a ferroalloy with high content of manganese, is made by heating a mixture of the oxides MnO₂ and Fe₂O₃, with carbon in a furnace. They undergo a thermal decomposition reaction. It is used as a deoxidizer for steel.

Ferro Manganese	Mn (%)	Si (%)	Carbon (%)	Phos (%)	Sulphur (%)
High Carbon Ferro Manganese	70 - 75	1.5 Max	6 - 8	0.35 to 0.43	0.05 Max
High Carbon Ferro Manganese	75 - 80	1.5 to 2.0	6 - 8	0.35 Max	0.05 Max
High Carbon Ferro Manganese Low Phos	70 - 75	1.5 Max	6 - 8	0.15 Max	0.05 Max

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Silicomanganese (SiMn), a ferroalloy with high contents of manganese and silicon, is made by heating a mixture of the oxides manganese oxide (MnO₂), silicon dioxide (SiO₂), and iron oxide (Fe₂O₃), with carbon in a furnace. They undergo a thermal decomposition reaction. It is used as a deoxidizer and an alloying element in steel.

Silico Manganese	Mn (%)	Si (%)	Carbon (%)	Phos (%)	Sulphur (%)
High Carbon Silico Manganese	60 - 65	14 - 18	2.0 Max	0.3 Max	0.05 Max
High Carbon Silico Manganese	65 - 70	15 - 20	2 Max	0.25 - 0.30	0.05 Max
Medium Carbon Silico Manganese	56 - 58	23 - 26	0.5 to 0.6	0.15 - 0.20	0.05 Max
Medium Carbon Silico Manganese	55	21	0.5	0.20 Max	0.05 Max

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