Silicon manganese (SiMn) also known as silicomanganese, 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.
Silicon increases the strength without a serious loss of ductility. It also adds scale resistance. These steels are generally heat treated to specific properties.
The standard grade silicon manganese contains 14.0% to 16.0% of silicon, 60% to 65% of manganese and 2% of carbon.
Vulcan Alloys currently trades in multiple grades of SiMn
| Chemical Specification | SiMn Grade 1 | SiMn Grade 2 | |
|---|---|---|---|
| Manganese (Mn) | 60.0% min | 65.0% min | |
| Silicon (Si) | 14.0% max | 16.0% min | |
| Carbon (C) | 2.50% max | 2.50% max | |
| Phosphorus (P) | 0.35% max | 0.30% max | |
| Sulphur (S) | 0.05% max | 0.05% max | |
| Size | Lumps / Powder | Lumps / Powder | |
| Packaging | 50 Kg HDPE bags / Jumbo bags | 50 Kg HDPE bags / Jumbo bags |