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Mild steel is definitely an alloy as has been stated several times. Alloying elements are carbon, typically 0.04% to 0.07%, phosphorus 0.005 to 0.02%, manganese 0.18 to 0.25%, sulphur at 0.008 to 0.02%, and smaller amounts of silicon, aluminium, nitrogen....
A small change can have a significant effect on strength and mechanical properties.
Cheers,
Glen
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