Circular Hollow Section - Maximum Thickness

[EngrRC]

What is the maximum thickness that is possible (in terms of fabrication) for a circular hollow section? I have cases wherein I need an 800mm circular section with 80mm thickness.

 

[human909]

I'll preface this by saying that I'm no expect... But I presume the realistic limit is the strain limit and the fabrication limit. 80mm thickness is within the strain limit of mild steel. The fabrication limit depends on the equipment and skill of your local fabricator.

 

[azcats]

That's a heck of a pipe. Purely out of curiosity, what's the application? Would definitely be custom made - that's a really inefficient section for most purposes.

These guys say they can roll up to 10" thick - but it depends on the diameter.

https://gbpipemill.com/processes/

 

[JStephen]

Google up the "Schwerer Gustav"- 800mm and presumably a good bit thicker than 80mm.
I expect it depends on what spec you need. I see that Nucor goes up to 2.25" for rolled/welded pipe, not really seeing anything over that right offhand.
I see some photos that look along that line, but no numbers stated on this site:

https://www.nssco.com/plate-forming/

Edit: Another potential source:

https://gbpipemill.com/processes/

Other ideas:
-If you're trying to achieve maximum strength, consider increasing the grade of the material.
-If you're trying to increase stiffness, consider nesting one tube inside another, with spacers between- just an idea, haven't seen this done myself.
-If it's part of stadium, skyscraper, or similar major project, the steel fabricators that normally do that work would be the ones to contact for ideas and capabilities.