Steel

Greg1959 · Jan 29, 2014

3 inch square tube or 3 inch round tube. Both have 3/8 inch wall and identical alloy components.

Application: Sub frame support for Ford 702 Dozer blade mounted onto Ford 860.

Which one (square tube or round tube) will provide the strongest support?

dpendzic · Jan 29, 2014

square tube is stronger

VicS · Jan 29, 2014

Square tube is sure a lot easier to work with. I wouldn't even consider using round.

LAA · Jan 29, 2014

Square -- it has more cross sectional area and even though it is the same wall thickness it is heavier due to the area. Thats steel, wood is just the opposite, round is stronger for any given dimensions, such as a 4'' round post compared to a 4X4.

bjb in TX from Ne · Jan 30, 2014

If you want pure strength then perhaps the square tube would be stronger; however, I do not show a 3" x 3/8 tube or pipe (they are different) in any of my structural tables. Also the square tube is most likely ASTM 500B, where the round tube could be a pipe and actually be a different alloy which could be stronger (yield point) and could be a tougher steel especially considering your application.

dpendzic · Jan 30, 2014

I would have to disagree on the wood. the section modulus for a 4X4 square is greater than a 4 inch circle---thus the bending stress are less

bjb in TX from Ne · Jan 30, 2014

Wood?

Steel

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