Silico manganese is an alloy of Iron, Silicon & Manganese. It has higher Silicon content in comparison to Ferro Manganese. Silicon reduces the solubility of carbon in manganese alloys, so carbon contents are inversely proportional to silicon content. It is a more potent deoxidizer of steel compared to Ferro manganese.
Ferro Phosphorus, a combination of phosphorus with iron, is used as an ingredient in high-strength low-alloy steel and is used as a good dehydrating agent that can remove water during the alloy formation. Addition of Ferro Phosphorous to steel alloys imparts many desirable properties upon the new alloy.