_______________ is the most important element, which controls the physical properties of steel ?
Correct answer: C. Carbon
- A. Manganese
- B. Silicon
- C. Carbon
- D. Vanadium
Explanation
Carbon has the greatest effect on steel hardness, strength, ductility, and weldability because it changes the steel’s microstructure and forms carbon-rich phases. The other alloying elements modify properties, but carbon is the principal controlling element.
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