Ferro Manganese

Ferro Manganese, 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. There are over 3 grades of Ferro manganese as listed below.

1) High Carbon Ferro Manganese

Mn	70% Min	75% Min	76% Min	76% Min
C	6-8% Max	7% Max	7% Max	7% Max
Si	1.50% Max	1.0% Max	1% Max	1% Max
P	0.30% Max	0.30% Max	0.25% Max	0.12% Max
S	0.03% Max	0.03% Max	0.03% Max	0.30% Max

2) Medium Carbon Ferro Manganese

Mn	75% Min	78% Min	80% Min
C	1.50% Max	1.50% Max	1% Max
Si	1% Max	1% Max	1% Max
P	0.20-0.30% Max	0.20-0.25% Max	0.20% Max
S	0.03% Max	0.03% Max	0.03% Max

3) Low Carbon Ferro Manganese

Mn	70% Min
C	0.10% Max
Si	4% Max
P	0.30% Max
S	0.03% Max

Silicon Manganese

Silico Manganese is an alloy with 65% to 68% manganese, 16% to 21% silicon, and 1.5% to 2% carbon. It is produced by smelting of slag from high-carbon Ferro Manganese or of Manganese ore with coke and a quartz flux. Smelting temperatures are high and greater energy is needed to reduce the quartz to silicon.

There are three variants of Silico Manganese:

1) High Carbon Silico Manganese

Mn	60% Min	65% Min
Si	14% Min	16% Min
C	2.50% Max	2% Max
P	0.30% Max	0.20-0.25% Max
S	0.03% Max	0.03% Max

2) Medium Carbon Silico Manganese

Mn	55% Min
Si	22% Min
C	0.50% Max
P	0.10-0.20% Max
S	0.03% Max

3) Low Carbon Silico Manganese

Mn	55% Min	55% Min
Si	25% Min	27% Min
C	0.20% Max	0.10% Max
P	0.10% Max	0.10% Max
S	0.03% Max	0.02% Max