Pick out the wrong statement ?

CHEMICAL ENGINEERING 23/04/2021

A. Cold cracking of a weld is due to the presence of hydrogen gas in the weld
B. True stress is given by, ζ = ζE (1 + εE), where ζE and εE are engineering stress and
engineering strain respectively
C. Phosphorous can be easily recovered in the iron blast furnace
D. High residual stress at the surface is beneficial for fatigue properties of a material

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