Which metallurgical outcome occurred when early steel production introduced manganese during iron smelting?

💡 Explanation

When manganese is added during early steel production, it suppresses the formation of cementite and stabilizes austenite, allowing martensite formation because austenite transforms into martensite upon quenching, increasing hardness. Therefore enhanced hardness results, rather than brittleness, weldability, or oxidation reduction which require different alloying elements and conditions.

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