Multiple choice

______ is the process which involves heating of hard steel to high temperatures followed by plunging into cold water.

  1. Metallurgy

  2. Annealing

  3. Calcination

  4. Quenching
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Quenching is a heat treatment process where a metal is heated to a high temperature and then rapidly cooled, usually in water or oil, to increase its hardness.

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