Carbon Equivalent and Preheat Screen
IIW carbon equivalent CE = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15 from the steel chemistry.
Example
You enter
- Carbon C (wt %) 0.25
- Manganese Mn (wt %) 0.8
You get
- Carbon equivalent (IIW) 0.383333
Details, formula, and sources
With a plain-English weldability / preheat band (the formula adopted in AWS D1.1; a screen, not a welding procedure).
CE_IIW = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15. Bands: < 0.35 readily weldable; 0.35-0.55 preheat advised; > 0.55 high hardenability.
The IIW carbon-equivalent formula as adopted in AWS D1.1 Structural Welding Code, by name; published formula.
Published weighted-sum formula; the output is a screening band, not a qualified welding procedure.
Estimate. AHJ and licensed professional govern.
Field names used by the API: c, mn, carbon_equivalent
- Composition the steel chemistry (weight percent of C, Mn, Cr, Mo, V, Ni, Cu) is user-supplied from the mill certificateAWS D1.1