Originally Posted by AtTheHelm
Astm schedule 40 pipe is a different alloy than hrew and dom tube.. It's built to hold pressure rather be a structural building material. There is 'pipe size tubing' though, which comes in pipe sizes but is uncoated and A500 spec for structural use.
Nominal 1 1/2" pipe is 1.90" OD btw.
The most common NPS pipes seen and used is A53,the old A36 is pretty much become obsolete.
A53 pipe is for LOW pressure and structural uses..which is the most common schedule 40 mentioned here...........
The most common used HREW these people use and most cost effective is the A513-1..which has several chemical composition allowances according to ASTM from 1008-1015....
To really understand the actual chemical composition difference between the 2 would be to take a close look at the Carbon and Manganese contents in the material itself..then notice the very close if not exact alloy...
Also notice the "loose" requirements of percentages allowable to be "tagged" a certian ASTM
Also notice mills pouring the from the same "pot"(furnace) and spread out to different size tubing/pipe sizes and both HREW or CREW.(i've worked many of the US Steel,Bethlehem,RG Steel,,which is shutdown now in baltimore,etc plants on shutdowns and such and SEEN the actual processes).
If you want to get into a real freindly debate without cluttering this man's thread up anymore than it already has and add any expertise to the actual differences in pipe and tube chemical compositons and alloy mixtures in detail according to the ASTM grades..then lets do it over here and open this old thread up where a few of us who actulay work the trades and hands on expereince chimed in on some pretty good debates on pipe vs tubing to clear up some internet myths and mumbo jumbo...
I'm all for it,for the fact i am in some pre-metalurgic studies at the moment on my own to be more than ready for an AWS-CWI school and test and venture into the WE side of it too(welding engineer)..and i am getting some GREAT help from a GE-Engineer i have known for years as a scheduler on these nuke outages and just this outage he moved up to the new Project manager/engineer for GE now and we are trying to help design some new lifting rigs to make the heavy lifting jobs much easier,safer and quicker..and we have to be "on our toes" so to speak when presenting these designs to the people who will actualy approve the money spent to build these..and that includes knowing the type of steel and such we will be using in our plans..
So i'm all for another debate in that thread to update it if you all like.
Bottom line here,,if i have a choice between common HREW and common NPS pipe and the pipe size fits the purpose..I'd more than likely buy the cheaper priced pipe over the higher priced HREW....
And..i will only reply as i can..i am at the moment in the middle of a Pre-outage prepping for another Turbine outage with GE on overtime and will be on 7-13's and more for a month or 2 in a week or so now..thats why i haven't been around in the past week much
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