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Physics Chemistry

Engineering :: Metallurgy

  Maximum hardness that can be achieved in plain carbon steel is of the order of
[A]. 50 Rockwell 'C'[B]. 66 - 67 Rockwell 'C'
[C]. 100 - 150 Rockwell 'C'[D]. 80-85 Rockwell 'C'
[E]. There is no such limit for hardness    

Answer: Option B
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