Carbon Equivalent Formula
Carbon Equivalent Formula
(OP)
I recently learned that there are more than one carbon equivalent (C.E.) formulas out there. The formulas I am interested in understanding are the AWS and the ASTM versions.
The AWS version includes a term Si/6. The ASTM version includes a term V/5. Can anyone explain the difference? I noticed that ASTM A709 steels contain up to 0.40% Si (some grades even more). The Vanadium content is limited to a much smaller level, typically 0.06% for example. If the silicon content of steel is frequently higher than the limit for Vanadium, then the AWS formula appears more strict.
Is this warranted?
The AWS version includes a term Si/6. The ASTM version includes a term V/5. Can anyone explain the difference? I noticed that ASTM A709 steels contain up to 0.40% Si (some grades even more). The Vanadium content is limited to a much smaller level, typically 0.06% for example. If the silicon content of steel is frequently higher than the limit for Vanadium, then the AWS formula appears more strict.
Is this warranted?





RE: Carbon Equivalent Formula
RE: Carbon Equivalent Formula
One draw back about using Annex XI for determining preheat is that if the preheat/interpass temp is lower than that required for prequalified WPSs, qualification testing must be performed. Ref: D1.1 Section 3.5.2