A) Heating to a high temperature and then cooling suddenly, e.g. by dipping in water, makes steel hard and brittle
B) Steel can be softened by heating it to a high temperature for a prolonged time and then cooling slowly. This is called quenching.
C) Tempering of hardened steel is done by heating it to just below red heat at controlled temperature and duration
D) Phosphorus impurity makes steel ?cold short?
Correct Answer: D
Solution :
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