Correct option is A
Sodium (Na) is
not used in
alloy steels because:
·
It is highly reactive – Sodium reacts easily with moisture and oxygen, making it unsuitable for strengthening steel.
·
It has low mechanical strength – It does not enhance hardness, toughness, or corrosion resistance in steel.
·
It is not metallurgically beneficial – Unlike other elements, sodium does not contribute to wear resistance, machinability, or strength in steels.
