Look up: ferro-manganese

1. ferro-manganese
   an alloy of iron and manganese(80 to 90% Mn)used in iron,steel and copper alloy foundries.Manganese combines with sulphur.It is a carbide stabilizer Category: Iron and steel industries
   Found on http://www.mijnwoordenboek.nl/definition
   
   
2. ferromanganese
   (from the article `manganese processing`) The primary product of the smelting process outlined above is a carbon-saturated ferroalloy containing 76 to 80 percent manganese, 12 to 15 percent ... Aluminum or ferrosilicon are added to the ladle before or during the tap in order to lower the level of dissolved oxygen in steel. Ferromanganes...
   Found on http://www.britannica.com/eb/a-z/f/20
   
   
3. Ferromanganese
   `Ferromanganese`, a ferroalloy with high content of manganese, is made by heating a mixture of the oxides MnO₂ and Fe₂O₃, with carbon, usually as coal and coke, in either a blast furnace or an electric arc furnace-type system, called a submerged arc...
   Found on http://en.wikipedia.org/wiki/Ferromangan