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promotes hardness, toughness, and corrosion resistance in steel.
Correct Answer: A — Chromium
Explanation:
Explanation: Effects of Various Elements in Steels Boron improves hardenability without the loss of (or even with some improvement in) machinability and formability. Calcium deoxidizes steels, improves toughness, and may improve formability and machinability. Carbon improves hardenability, strength, hardness, and wear resistance; it reduces ductility, weldability, and toughness.