Carbon Equivalent Calculator

Calculate carbon equivalent values for welding assessments and material selection

Select Calculation Method

IIW/CEV

International Institute of Welding

CEV = C +
Mn 6
+
Cu + Cr 15
+
Mo 4
+
Ni 40
+
V 5

Most widely used method for carbon steel welding assessments. Recommended for structural steels.

CET

Carbon Equivalent Threshold

CET = C +
Mn + Mo 10
+
Cr + Cu 20
+
Ni 40

Alternative method for specific applications. Better suited for low-alloy steels with higher carbon content.

About Carbon Equivalent

Carbon equivalent (CE) is a measure used to understand how different alloying elements affect the hardenability and weldability of steel. Higher CE values indicate increased susceptibility to cracking during welding.

Generally, steels with CE values below 0.40% are considered to have good weldability, while values above 0.60% may require preheating and special welding procedures.