16. What is the process if hot steel is cooled slowly the old structure is retained and it will have fine grains that makes it easily machined?
Annealing
Hardening
Tempering
Normalizing
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Answer:
The hardening treatment for most steels consists of heating the steel to a set temperature and then cooling it rapidly by plunging it into oil, water, or brine. Most steels require rapid cooling (quenching) for hardening but a few can be air-cooled with the same result.
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Tempering is the right answer
Explanation:
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