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← HistoryWhich problem limited ancient crucible steel production even with good ore?
A)Insufficient buoyancy eliminates slag
B)Thermal expansion resisted mold
C)Inadequate oxygen initiated eutrophication
D)Carbon control caused embrittlement✓
💡 Explanation
Carbon control in steelmaking involves precise alloying additions, as high carbon levels cause embrittlement due to cementite (iron carbide) formation in the grain boundaries. Therefore, poorly-managed furnaces led to brittle tools, rather than tools with greater ductility or hardness obtained via controlled techniques.
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