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Which among the following media of quenching the slowest?

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in Engineering Material & Metallurgy by (773k points)
Which among the following media of quenching the slowest?

(a) Caustic soda

(b) Sodium chloride

(c) Mineral oil

(d) Air

The question was asked in an international level competition.

Enquiry is from Normalising & Quenching in section Heat Treatment of Engineering Material & Metallurgy

1 Answer

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Best answer
Correct option is (d) Air

Easiest explanation: The rate of cooling heavily depends on the quenching medium used. 5-10% caustic soda and 5-20% NaCl are the two most popular media in terms of severity, followed by cold and warm water. This is followed by mineral, animal, and vegetable oils. Finally, air has the lowest severity of the preferred media.

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