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


API 5CT-Gr. K55 structural properties.

API 5CT-Gr. K55 structural properties.

API 5CT-Gr. K55 structural properties.

Just checking if anyone has seen API 5CT- Grade K55 used for structural purposes.
(Steel piles in this case).
The chemical composition table (Table C.4 in API 5CT) does not list any limits (max. or min.) for any elements other than Phosphorous (P) and Sulfur(S).
Without a max./min. on critical elements including Carbon, I don’t see how Gr. K55 can be used for
structural purposes.
I've also seen test results reporting E=23,000+/- or about 20% less than the 29,000 ksi value used for steel design.
Any feedback would be appreciated.
I’ll also post this in the Structural Forum

RE: API 5CT-Gr. K55 structural properties.

The only intended use is for well casing with threaded couplings , yield strength 55,000 psi.

RE: API 5CT-Gr. K55 structural properties.

I saw people make bridges for light traffic on rough terrain and local roads, but only to avoid discarding used pipe.

New only for casing.

RE: API 5CT-Gr. K55 structural properties.

I would think this depends on the structural code you are designing to and how this treats non listed materials and testing/certification of these.

Note casing can be brittle at ambient temperatures.

RE: API 5CT-Gr. K55 structural properties.

API 5CT is, as said above Casing pipe of which K55 is a fairly basic grade and is designed as a screwed connection and not tested at low temperature or to any great extent.

I don't think it can be used for any other purpose without more testing and addition of elements to the specification.

Does someone just have a pile of this hanging around?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

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!


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