Carbon Equivalent of forged flanges
Carbon Equivalent of forged flanges
(OP)
Our supplier is proposing a carbon steel F52 forged flange with a CEV of 0.42, while our client specification is asking for 0.39 saying that the line is sour service. In my personal opinion once we adopt a welding procedure capable to maintain hardness below 22HRc (248 HV10) the request for 0.39 is meaningless (considering also that the supplier has already said he cannot reach such value!)
Anybody has more experience on this subject?
Thanks
Anybody has more experience on this subject?
Thanks





RE: Carbon Equivalent of forged flanges
In this case, your client is absolutely correct in specifying an upper limit to CE for base metals. Just because you are using a weld procedure that has been qualified will not assure you will have 22 HRc after welding.
RE: Carbon Equivalent of forged flanges
Besides supplier gives us the flange but we will perform all welding qualification therefore we will be able to verify if after welding harness is <22HRc or not
RE: Carbon Equivalent of forged flanges
The vanadium concerns me because it promotes increased resistance to softening (hardness reduction) during and after thermal treatment (such as PWHT). I totally agree with your approach to qualify this material.
RE: Carbon Equivalent of forged flanges
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/