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?
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
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
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
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
RE: Use of forged bar as per UG-14