Carbon equivalent (CEV) calculator

CEV (IIW) and Pcm from a steel's chemical composition, with a weldability indication. Prefill any grade from the database.

Prefill from a grade (mid-range composition)

C (%)

Si (%)

Mn (%)

Cr (%)

Mo (%)

V (%)

Ni (%)

Cu (%)

Carbon equivalent CEV (IIW): 0.772

Pcm (Ito–Bessyo): 0.512

Difficult to weld — high preheat, low-hydrogen process and a qualified procedure are essential.

CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 · Pcm = C + Si/30 + (Mn+Cu+Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B. Values are the mid-points of the grade's standard composition range; adjust any element and the result updates. For a real heat, use the mill certificate values.