Carbon Equivalent Calculator

Inputs

View results
Carbon content by mass percent from the mill test report.
%
Manganese content by mass percent.
%
%
%
%
%
%
Silicon is used by Pcm. It is not part of the IIW CE formula.
%
Boron is small but heavily weighted in Pcm. Enter mass percent, not ppm.
%
Procedure, project or shop screening limit to compare against CE/CEV. This is user-entered because code and WPS rules differ.
%
Procedure, project or shop screening limit to compare against Pcm. This is not a built-in code limit.
%

Results

Default result
Edit inputs
CE / CEV(CE)
0.336%
Pass

within entered CE limit

C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15.

Also computed

Pcm(Pcm)Pass0.2265%

within entered Pcm limit

CET(CET)0.2608%

CE limit margin(CE_lim - CE)0.064%

Pcm limit margin(Pcm_lim - Pcm)0.0235%

Controlling ratio(max(r))0.906x

Preheat attentionPass0band

within entered limits

0 within entered limits; higher bands need procedure review.

Method notes 3 notes
  • Inputs are chemistry mass percentages from an MTR or verified material specification.
  • The CE and Pcm limits are user-entered comparison limits; the calculator does not embed code, WPS or customer preheat tables.
  • Higher carbon equivalent means higher hardenability risk, but real preheat also depends on thickness, hydrogen level, heat input, restraint, joint detail, ambient temperature and procedure qualification.

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