Ferromanganese

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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.

A North American standard specification is ASTM A99. The ten grades covered under this specification includes;
Standard ferromanganese
Medium-carbon ferromanganese
Low-carbon ferromanganese

A similar material is a pig iron with high content of manganese, is called spiegeleisen.