- Sulphur
- Phosphorus
- Manganese
- Silicon
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Answer: Option 3
It is a mild deoxidant acting as a cleanser taking the sulphur and oxygen out of the melt into the slag. It increases the harden ability and tensile strength but decreases ductility. It combines with sulphur to form globular manganese sulphides, essential in free cutting steels for good machinability.
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