High Carbon Silicon Manganese with Low Phosphorous contains minimum 60% manganese. Centom Steels & Ferro Alloys Ltd. Manufactures High Carbon Silicon Manganese with Low Phosphorous. Centom Steels & Ferro Alloys Ltd. Also manufactures different ranges of Silicon Manganese. High Carbon Silicon Manganese with Low Phosphorous consists of minimum 15% silicon. The potassium level it contains, range like 0.15- 0.20%. It can also be customised as per customer requirement.