×
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!

*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

Cl SCC in 300SS

Cl SCC in 300SS

Cl SCC in 300SS

(OP)
Question on Chloride Stress Corrosion Cracking in 300SS material - working in oil refinery industry, looking to retube a naphtha furnace with new 317/L tubes. Some materials engs have expressed concern with CL SCC potential. The Process engs are claiming aqueous chlorides are not possible in normal operation of furnace inside these tubes. However, there is concern that transient operations may introduce chlorides inside these new 317/L tubes and cause Cl SCC. I understand many refineries have retubed furnaces with 300SS material though, so this must be managed somehow? The 300SS tubes are preferred option since they allow for higher operation temperatures over long term & have higher allowable stresses under both the elastic & rupture (creep) design basis (per API530).

RE: Cl SCC in 300SS

This service is world of its own.
There are tons of papers out there about it.
Any sensitization (such as in welds) is fatal.
You can do this with 300 SS materials, but you have to have safeguards to PREVENT the introduction of water.
At temperatures of 150-250C, low ppm levels of Cl, low pH, and any S and the SCC will initiate quickly.
Such as times measured with a stopwatch and not a calendar.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

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! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close