Addition of _____________________ to steel does not impart hardness?
Correct answer: B. Copper
- A. Nickel
- B. Copper
- C. Chromium
- D. Silicon
Explanation
Copper is added to steel mainly to improve atmospheric corrosion resistance and strength, rather than as a principal hardening element. Chromium and silicon can increase hardness, while nickel also strengthens the steel matrix.
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