Need help w/carbon equivalency determination
Need help w/carbon equivalency determination
(OP)
OK here's a dumb question from someone who usually works in the oil patch, not metallurgy.
I need to calculate a carbon equivalent so that I can show that a steel proposed for use in a tank will meet UL 142.
There are several formulae one can use to calc the carbon equivalent %. Which is the one to use? None of my references have this info (Marks dropped the ball on this one... at least I can't find it in there!) and a web search produces at least five different eqns for carbon equiv %.
Thanks for your help guys! Pete
I need to calculate a carbon equivalent so that I can show that a steel proposed for use in a tank will meet UL 142.
There are several formulae one can use to calc the carbon equivalent %. Which is the one to use? None of my references have this info (Marks dropped the ball on this one... at least I can't find it in there!) and a web search produces at least five different eqns for carbon equiv %.
Thanks for your help guys! Pete
Thanks!
Pete





RE: Need help w/carbon equivalency determination
for low alloy steel, elements are w% amounts;
Ceq = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
for modern low carbon steels, elements are expressed in weight percent amounts;
Ceq = C + Si/25 + (Mn+Cr)/16 + (Cr+Ni+Mo)/20 + V/15
RE: Need help w/carbon equivalency determination
Thanks!
Pete
RE: Need help w/carbon equivalency determination
Thanks!
Pete
RE: Need help w/carbon equivalency determination
Use IIW for comparison with SA 36 to SA 516 Grade 70. These are considered C-Mn low alloy steels, and the IIW is used by AWS and ASME B&PV code for base metal weldability comparisons.
The second CE equation was referenced from a Welding Research Council Bulletin.
RE: Need help w/carbon equivalency determination
Thanks!
Pete