Which outcome consistently emerged when Song Dynasty iron-making exceeded charcoal supply?

💡 Explanation

Steel emerged due to incomplete carbon removal in large cast iron melts, so heterogeneous carbon distribution plagued early steel. The decarburization process was inconsistently controlled, therefore, material heterogeneity was the outcome rather than work prioritization or crucible advancements.

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• Which outcome results when Song Dynasty iron casting efficiency increases rapidly?
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• Which structural mechanism allowed Roman fortifications like Hadrian's Wall to withstand significant ground subsidence over centuries?
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