Equivalent Carbon Calculator

Iñaki Durañona

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About this app

Actual supported formulas: AWS, IIW (Dearden and O'Neill formula), PCM Cracking Parameter (Ito and Bessyo formula), PLS Pipeline Steels (Mannesmann formula) and Short Cracking Parameter for missing values.

AWS
The AWS states that for an equivalent carbon content above 0.40% there is a potential for cracking in the heat-affected zone (HAZ) on flame cut edges and welds. However, structural engineering standards rarely use CE, but rather limit the maximum percentage of certain alloying elements. This practice started before the CE concept existed, so just continues to be used. This has led to issues because certain high strength steels are now being used that have a CE higher than 0.50% that have brittle failures.

IIW
Dearden and O'Neill formula, which was adopted by IIW in 1967. This formula has been found suitable for predicting hardenability in a large range of commonly used plain carbon and carbon-manganese steels, but not to microalloyed high-strength low-alloy steels or low-alloy Cr-Mo steels.

PLS
Mannesmann formula its common used for critical metal parameter like Pcm. Most common use is for Weldabilty of Heavy Wall Seamless Line Pipe Steel.

PCM
The Japanese Welding Engineering Society adopted the critical metal parameter (Pcm) for weld cracking, which was based on the work from Ito and Bessyo.

What’s new

1.3
PCM Cracking formula
Yurioka formula (which could determine the critical time in seconds Δt8-5 for the formation of martensitic in the Heat Affected Zone (HAZ) in low-carbon alloy steels.)
Other minor changes

1.1 and 1.2
Correction on PCM name error
Correction on Short PCM formula
Small changes to preheat result