SA213T23 PWHT vs. Temperbead
SA213T23 PWHT vs. Temperbead
(OP)
My company is being asked by a client to weld SA213-T23 to a SA213-T12 boiler wall tubes, using a temperbead welding procedure to eliminate any carbon migration issues caused by PWHT. In all the research I've read, I can find no recent information supporting any welding T23 material without PWHT. As it is currently unassigned in ASME Section IX, and therefore not addressed in the applicable ASME Sec I, I am just looking for a little advise with this relatively new material. We have a WPS utilizing ER90S-B3 and no PWHT that was developed in 2009, but in light of new research we will be using Bohler P23-IG or equivalent filler with PWHT for our new WPS's. Is thickness a determining factor for PWHT on this material?
Also I am in search of material to qualify the new WPS and am having trouble locating any of the T23, any leads would be appreciated.
Also I am in search of material to qualify the new WPS and am having trouble locating any of the T23, any leads would be appreciated.





RE: SA213T23 PWHT vs. Temperbead
RE: SA213T23 PWHT vs. Temperbead
Though T-23 is termed as at par with P-5A grade (conventional 2.25Cr-1Mo), in reality it's not the same. Presence of W & V will always cause excess as welded hardness which can only be reduced through PWHT. Development of temperbead welding technique for this steel is still has a question mark and a discussion with consumable manufacturer would be advisable.
One thing note PWHT will not reduce the Carbon migration,however could be of immense help in overall better weld properties. You may contact EPRI or seek the expertise of the welding consumable manufacturers as applicable.
Thanks
http://cstools.asme.org/csconnect/pdf/R071614.pdf
http://dspace.vsb.cz/bitstream/handle/10084/89878/...
http://www.nickelalloys.com.br/Metrode%20CD%202011...
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario, Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
RE: SA213T23 PWHT vs. Temperbead
Check out all the massive outages at the new european supercritical units in 2011 due to inability to PWHT final field weld of membrane waterwalls made of T23/T24. Crazy startup water chemistry procedures were needed to avoid H2 cracking. Don't go there, unless you revise the final field weld material in some amnner.
"Nobody expects the Spanish Inquisition! "
RE: SA213T23 PWHT vs. Temperbead
All of the T23 to T91 welds on the one supercritical plant were made in the shop by the Japanese Boiler Manufacturer. I am not sure which filler metal they used. No weld failures of these tube welds have been reported; however, the service has only been a year.
davefitz and pradip,
Thanks for the info. A star for both of you.
RE: SA213T23 PWHT vs. Temperbead
RE: SA213T23 PWHT vs. Temperbead
"Whom the gods would destroy, they first make mad "