Pick out the wrong statement ?

A. High residual stress at the surface is beneficial for fatigue properties of a material

B. Phosphorous can be easily recovered in the iron blast furnace

C. Cold cracking of a weld is due to the presence of hydrogen gas in the weld

D. True stress is given by, ? = ?E (1 + ?E), where ?E and ?E are engineering stress and

E. ineering strain respectively

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