Q22
When low carbon steel is heated up to upper critical temperature
A.
There is no change in grain size
B.
The average grain size is a minimum
AnswerC.
The grain size increases very rapidly
D.
The grain size first increases and then decreases very rapidly
Answer: Option B
Solution
Answer: Option B
Solution:
When low carbon steel is heated up to upper critical temperature, the average grain size is a minimum.