Q.

Maximum hardness that can be achieved in plain carbon steel is of the order of

A. There is no such limit for hardness
B. 100 - 150 Rockwell 'C'
C. 66 - 67 Rockwell 'C'
D. 50 Rockwell 'C'
E. 80-85 Rockwell 'C'
Answer» C. 66 - 67 Rockwell 'C'
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