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For early cast iron production in China, which outcome resulted from charcoal containing high sulfur?

A)Brittle iron parts, increased failure
B)Higher carbon content, increased hardness
C)Lower melting point, easier casting
D)Faster oxidation, better steel creation

💡 Explanation

Increased brittleness of parts occurred because sulfur acted as an impurity during solidification via grain boundary segregation, causing stress concentrations; therefore, components made with high-sulfur iron failed at lower stresses, rather than gaining the lower melting points or superior hardness.

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