×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

T22 U bend heat treatment

T22 U bend heat treatment

T22 U bend heat treatment

(OP)
ASME code does not require T22 tube bends to be post bend stress relieved.

However, what is the industry practice?  Should T22 material bends be stress relieved to reduce possibility of cracking or corrosion.  Or perhaps these are non-issues with this type of material?

Thanks,

Alex

RE: T22 U bend heat treatment

This is dependent on service conditions, and is client driven. For heat exchanger applications in a wet environment, I would recommend a post bend stress relief operation of U-bends to reduce susceptibility to corrosion fatigue.

For steam conditions in a boiler reheater or superheater, I don't see any benefit in performing a post bend stress relief.

RE: T22 U bend heat treatment

(OP)
The application is a steam boiler so the U bends will see water, steam and a mixture. Most of the unit in fact will have some wetness except the bottom couple of rows which will be superheat.  I guess in this case post bend stress relief would be required.

In this application, the water conductivity is low (ie. 0.25 microseimens)so .  Exhaust gas is based on combusted natural gas with no sulfur.

Thanks,

Alex

RE: T22 U bend heat treatment

With T22 I would not post-bend stress relieve.  The risk of screwing up the heat treatment is greater than the possible benifits.

= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm

RE: T22 U bend heat treatment

edstainless;
You must be thinking of T91 material. You really cannot screw up the heat treatment of this material unless the stress relief temperature gets away, and you re-austenitize (1600 deg F) and quench. The T22 tube materials are very forgiving, and are commonly stress relieved after welding attachments during fabrication of tube assemblies.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources