Ferromanganese: A ferrous alloy composed of manganese and iron. Main categories: high carbon ferromanganese (7% carbon content), medium carbon ferromanganese (1.0~1.5% carbon content), low carbon ferromanganese (0.5% carbon content), metal manganese, mirror iron, silicon-manganese alloy.

In steelmaking, it is used as a deoxidizer and alloy additive, and it is an iron alloy with a large amount. The manganese ore used for smelting ferromanganese generally requires 40-50% manganese, the ratio of manganese to ferromanganese is greater than 7, and the ratio of phosphorus to manganese is less than 0.003. Before smelting, manganese carbonate ore needs to be roasted, and powder ore needs to be sintered and agglomerated. Generally, ore with high iron and phosphorus content can only be used in combination, or through selective reduction to obtain manganese-rich slag with low iron and low phosphorus. Coke is used as a reducing agent during smelting, and some factories also use lean coal or anthracite. The auxiliary raw material is mainly lime, and silica is generally added when smelting manganese-silicon alloys.