CE(IIW) = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15
CET = C + (Mn + Mo)/10 + (Cr + Cu)/20 + Ni/40
Ceq = C + Si/24 + Mn/6 + Ni/40 + Cr/5 + Mo/4 + V/14
CEN = C + A(C) * (Si/24 + Mn/6 + (Cu + Ni)/15 + (Cr + Mo + Nb + V)/5 + 5B), where A(C) = 0.75 + 0.25*tanh(20(C - 0.12))
Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B
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