×
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

Steel Pipe Classification

Steel Pipe Classification

Steel Pipe Classification

(OP)
I had some samples of steel pipe tested.  The pipe was supposed to be A53 (Grade B).  The yield and tensil came out better than required (on all except for one) but the Modulus of Elasticity for each sample were 24,000ksi, 21,000ksi, 27,000ksi and 14,000ksi...all below what I would expect for steel and the last one is very low.  Could this be a cast iron?  I had planned on using this as faslework posts but am not liking what I am seeing in these results.  Any thoughts?

RE: Steel Pipe Classification

I would be inclined to use new material - used equipment of unknown origin is dubious at best.  Maybe just use a Safety Factor of 4 or 5??

RE: Steel Pipe Classification

How did you measure the modulus?  As far as that goes, how did you measure the tensile properties?

If you are taking the modulus from the load/extension curve of the strip tensile specimen, the modulus is most certianly in error.  For one, the extensometer is probably not percise enough for an accurate modulus determination, but more important is the alignment and geometry of the test specimen is not controlled well enough.

If you had cast iron, you would have very low elongation.  If you met the elongation requirements of A53, it isn't cast iron.

If you are taking the taking the modulus from the load/extension diagram, and those are your results, I would question the tensile properties (tensile and yield) since those values are, in some cases, 50% lower than what you would expect, which would suggest to me that something went wrong with the tests.

It is kind of hard not to meet the A53 Grade B properties.

rp

RE: Steel Pipe Classification

OK, on your attachement, there is
#1-18"   .429

Is that to indicate 18" diameter pipe with a wall of 0.429"?

Is this a case where you have some unknown pipe and you are trying to use it for something?  If so, you need to get some chemical analysis tests done.  Looking at the results for #4, I'd wonder if it was even magnetic.  If you had the chemical analysis, that might help.

rp

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