Which of the following impurity in cast iron makes it hard and brittle?

LohaHridoy
  1. Silicon
  2. Sulphur
  3. Manganese
  4. Phosphorus

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Answer: Option 2

Sulfur is normally regarded as an impurity and has an adverse effect on impact properties when a steel is high in sulphur and low in manganese. Sulphur improves machinability but lowers transverse ductility and notched impact toughness and has little effects on the longitudinal mechanical properties.

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