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Why is sulfur in pig iron kept low?

(a) Steel impurity

(b) Electrical resistivity

(c) Demagnetizing effect

(d) Low coefficient of expansion

This question was addressed to me by my college professor while I was bunking the class.

I want to ask this question from Sintering and Compacting, Pig Iron and its Manufacture topic in division Testing of Materials, Foundry & Powder Metallurgy of Engineering Material & Metallurgy

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Correct answer is (a) Steel impurity

The best explanation: Basic pig iron must be low in sulfur of about 0.04%. This is since sulfur is an active impurity in steels and is not eliminated in refining furnaces.

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