Centom Steels & Ferro Alloys Ltd. Manufactures Medium Carbon Silicon Manganese. Centom Steels & Ferro Alloys Ltd. Also manufactures different ranges of Silicon Manganese. Medium Carbon Silicon Manganese comes with 55-60% manganese. Medium Carbon Silicon Manganese contains minimum 20% silicon. It is available with maximum 0.15% potassium. It can also be customised as per customer requirement.