×
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

Austenitic SS for Steam Application

Austenitic SS for Steam Application

Austenitic SS for Steam Application

(OP)
Hi,

Would it be a good idea to make a pipe fitting out of ASTM A182 Gr F316 material for an application where steam at high pressure / temperature (100+ Barg / 525°C) is present?

I'm not sure if plain austenitic steels like gr 316 would end up with Intergranualar Corrosion at temperature 525°C  in presence of corrosive ambience. Has anyone experienced it?

OR Instead of F316, would it be better to use a stabilized grade like F347 for this application?

Thanks in advance.

RE: Austenitic SS for Steam Application

pingmi;
No. During normal service conditions, you will not experience SCC. I would be more concerned with sigma phase formation and ID exfoliation in 316 ss over time that could result in creep failure.

My preference would be to use a stabilized grade of austenitic stainless steel - 347H or 321H, which is more suitable for high temperature and pressure steam service.

RE: Austenitic SS for Steam Application

intergranular corrosion due to sensitization can be a problem for prolonged exposure to high temeperature 800 to 1500°F (427 to 816°C).
It all dependeds on the time of exposure and corrosivity of the service.
"Both Alloys 316 and 317L are susceptible to precipitation of chromium carbides in grain boundaries when exposed to temperatures in the 800 to 1500°F (427 to 816°C) range. Such "sensitized" steels are subject to intergranular corrosion when exposed to aggressive environments."
http://www.sandmeyersteel.com/316-316L.html#3
S.

Corrosion Protection & Corrosion Control
 

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