×
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

Use of forged bar as per UG-14

Use of forged bar as per UG-14

Use of forged bar as per UG-14

(OP)
Since the changes the UG-14 and the requirements of code cases 2155 and 2156 it has been almost impossible to obtain forged bar with additional transverse tests already completed.

I would have thought that a market for this requirement would have been created but this simply isn't the case.

Is anyone truly applying the rules of UG-14 and the two code cases, has everyone ignored it or does everyone avoid using forged or hot rolled bar?

RE: Use of forged bar as per UG-14

The silence on this one is deafening!

From our limited experience with this issue,  some folks have been buying bar and then wasting some of it plus a fair bit of money to have the transverse tests done on samples.  This is inefficient relative to having a spec which requires that lots of bar be tested in accordance with these requirements, but to our knowledge this hasn't happened yet.

I presume that large pieces of bar occasionally come with flaws that actually make this a meaningful test.  Perhaps I've never worked with barstock that's large enough or of poor enough quality, but we haven't yet seen material rejected on the basis of these tests.

If I remember correctly this is in relation to barstock greater than 4" OD, correct?

RE: Use of forged bar as per UG-14

(OP)
It's for bar stock greater than 4 1/2" (4" NPS)

You're quite right about the cost.

I have seen some material fail, there generally seems to be a 10% drop in UTS from the longitudinal test to the transverse test.

RE: Use of forged bar as per UG-14

I gave Fawles an opinion in another forum.

This is what I have seen with bar stock,forged and hotrolled.

Hotrolled: Stringers,pipe and seams. Enough to cause longitudinal leaks when used as parts.

Forged: Bursts.

I would suggest LP or MT of the fisnished part along with additional tension testing as reuired by the base material spec.. The overall quality is getting worse. Believe this is due to the market demand and imports from certain countries. Have not had any problems with pipe fittings since the early 90s.

So,unless I had to use one of these product forms,I would try for something else or perform addtional NDE. Maybe spend a little more up front for a higher grade bar material.

Just my opinion...what is really your final cost?

RE: Use of forged bar as per UG-14

deanc:  these were carbon steel bar, correct?  Entirely believable, and I hear you about the quality decrease.  What about for austenitic stainless steels and higher alloys?  I've never seen a flaw in these materials personally, which of course means nothing.

RE: Use of forged bar as per UG-14

Depends on the Spec. and the mill. ie:$$$$$$

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