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

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

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.
Bissoy MCQ

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