×
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

creep range

creep range

creep range

(OP)
I have a heat exchanger of material SA516-70 , I need to know the creep range of this material and other material , where can I find such a data whether in a code or website ?

RE: creep range

Look in the allowed stress tables, below the dark line is creep limited.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: creep range

The time dependent (creep) allowable stress values are in ASME Section II, part D in italicized font.

RE: creep range

(OP)
Merengr , I have ASME Section 2 part D ,, but can't find th exact page , I found wording about time dependant only but I can't find the table

RE: creep range

Ok, the table in the 2015 Edition of ASME B&PV Code is 1A. Page 20, the time dependent values start at 750 deg F for SA 516 Gr 70.

RE: creep range

For the first time that I can recall, I am actually going to disagree with metengr surprise. The italics that he refers to are when the allowable stress becomes governed by time-dependent behaviour.

However, that is NOT when creep starts. For that, you will need to refer to API 579-1/ASME FFS-1, Table 4.1, titled "Temperature Limit Used To Define The Creep Range". Here, you will find that the creep range actually starts at a lower temperature than would be inferred by the italics method in Section II, Part D. SA-516 Gr. 70, being a carbon steel with a UTS > 60 ksi would start the creep range at 700°F (371°C).

RE: creep range

TGS4 you are technically correct, if you only accept FFS-1 versus ECCC versus NIS creep-rupture data and definitions. I could disagree on the temperature when creep-rupture begins as defined by FFS-1 versus the approach by Section II, part D. I am going on memory here but the European Creep Collaborative Committee (ECCC) publishes an even lower threshold creep temperature than what is published in FFS-1 or even the time dependent value in Part D.

RE: creep range

TGS4, Metengr,
Agree with you on the lower temperature at which creep starts but it is hard to convince people of this.

RE: creep range

DSB123,
If it can happen it will happen, somewhere, sometime. Materials are perverse that way.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: creep range

Hi Mech212,
In addition to the guidance provided by metengr, you may find additional resources at this link http://www.ommi.co.uk/etd/eccc/advancedcreep/DShee....
The steel specifications mentioned in these data sheets conforms to European Specifications. However nearest ASME/ASTM equivalence could always be found by proper searches.
Hope this would help you.
Thanks.

Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

RE: creep range

ironic metallurgist,
Eh????

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


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