×
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

API TR 938-C | Cold work on super duplex tubing

API TR 938-C | Cold work on super duplex tubing

API TR 938-C | Cold work on super duplex tubing

(OP)
We need to make some tubing systems (up to 1/2", ASTM A789) from SAF 2507. API TR 938-C reads that all 25% CR DSS require solution annealing when you cold bend tube
Calculating the amount of strain/cold work when applying a standard Swagelok hand bender to bend a tube, ASME VIII-1 UNF-79(a)(2)(c) tells me I get 16.7% strain (input; 1.1/2" bend radius for a 1/2" tube, based on Swagelok's Tube Fitter's Manual).
Does anyone have any experience with bending super duplex tubing and post heat treatment?

RE: API TR 938-C | Cold work on super duplex tubing

XL83NL;
I would check with a company like Sandvik or the company that supplied you the product line directly. Normally, when I review ASME Code Case submittals, the material supplier of the product, like Sandvik, provides all necessary technical information for committee review.


http://www.smt.sandvik.com/en/products/tube-pipe-f...

RE: API TR 938-C | Cold work on super duplex tubing

(OP)
Good idea. Ill look into it.

RE: API TR 938-C | Cold work on super duplex tubing

The API heat treatment requirement is related to sulphide stress cracking resistance. If the application is not process related with H2S, subclause A.2.6 might be more appropriate. However, the cold work might impact upon chloride SCC resistance too, and this would need to be reviewed.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

RE: API TR 938-C | Cold work on super duplex tubing

(OP)
Ive contacted Sandvik, Ill see what they come up with.
FYI: the service is either lactic acid with w/ traces of Cl (say 10 ppm), or MIBK.

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