×
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

Normalizing 516 gr 70 for use at high temperatures

Normalizing 516 gr 70 for use at high temperatures

Normalizing 516 gr 70 for use at high temperatures

(OP)
Is there any advantage to using normalized 516 gr 70 at temperatures around 800F?

RE: Normalizing 516 gr 70 for use at high temperatures

McT178;
There is no significant advantage for using this pressure vessel steel in elevated temperature service. The reason is slightly lower creep strength in comparison to coarse-grained steels, which are tailored for use at elevated temperature service. The normalized steels are good for moderate to low temperature service.
 

RE: Normalizing 516 gr 70 for use at high temperatures

(OP)
Thanks metengr.  I always thought normalizing was only helpful at lower temperatures, and its benefits were lost at higher temperatures - but the customer is asking for it.

RE: Normalizing 516 gr 70 for use at high temperatures

The fine grained, normalized SA-516 gr 70 steels have lower higher temperature creep properties and a greater tendency to graphitize than A-515 gr 70, especially at 800 F.  

RE: Normalizing 516 gr 70 for use at high temperatures

Agree with Stanweld, something like A515 is a better choice.  
BTW A515 is NOT a good choice for low temperature service.   

RE: Normalizing 516 gr 70 for use at high temperatures

(OP)
Just for my curiosity if you don't mind - how does the grain structure effect the creep strength at different temperatures?

RE: Normalizing 516 gr 70 for use at high temperatures

McT178;
Coarse grained material means fewer grain boundaries, which means fewer sites for creep void nucleation, which ultimately means higher creep strength.
 

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