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Our carbon equivalent calculator is simple to use: Enter the weight percentage composition of each alloying element in their respective fields. Ensure you don't leave blanks — if any element is absent in your alloy, enter 0 in its field. The calculator will automatically determine the carbon equivalent in the following manner:
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Carbon equivalent formulae were originally developed to give a numerical value for a steel composition which would give an indication of a carbon content which would contribute to an equivalent level of hardenability for that steel.
The carbon equivalent is a measure of the tendency of the weld to form martensite on cooling and to suffer brittle fracture. When the carbon equivalent is between 0.40 and 0.60 weld preheat may be necessary. When the carbon equivalent is above 0.60, preheat is necessary, postheat may be necessary.
Due to widespread application of the carbon equivalent in Japan, the Japanese Welding Engineering Society (JWES) published its own carbon equivalent equation in 1973: CE = Wes. C+Si/24+Mn/6+Ni/40+Cr/5+Mo/4+V/14 (2)
The carbon equivalent is a measure of the tendency of a material to form cold cracks depending on its chemical composition. Further explanations of the individual carbon equivalents (CET, CE, PCM, CEM, CEN) can be found here.
Equation: PCM = C + Si/30 + (Mn + Cu + Cr)/20 + Mo/15 + Ni/60 + V/10 + 5*B . CEM. The carbon equivalent CEM can only be used under the very limited conditions of the short cooling time range (2 to 6 s) and the narrow validity range of the chemical composition (C: 0.02 - 0.22, Si: 0.00 - 0.50, Mn: 0.40 - 2.10, Cu: 0.00 - 0.60, Cr: 0.00 - 0.50 ...
CE is Carbon Equivalent as given in AWS D1.1. Pcm formula is by Japanese Welding Engineering Society’s critical metal parameter: C.E. Weldability. 0.15 Max. Excellent Weldability with all process, No preheat, Interpass or Postheat necessary. 0.15 to 0.30.
