Sulphur is generally regarded as harmful in cast Iron. It lowers the viscosity of the melt and tends to make the cast iron hard and brittle. So it should be kept well below 0.1 percent for most foundry purposes.
In wrought iron, 0.01 to 0.04 per cent of Sulphur produces shortness-that is , the metal becomes brittle and unworkable at red heat, although possessing the usual qualities when cold.
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