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You'll probably have a hard time finding a large enough black pipe at the hardware store. At least, I know I've had to order mine online because there's nothing over 1" available locally in black.
The square should work OK. The pipe is a shield against the moving gasses, some areas of which will be hotter than others in a less than perfect forge. The square tube can perform that function pretty well too, I would guess. The atmosphere inside the tube is small and only moves by convection so it should tend to equalize rapidly no matter the shape of the container. Round might indeed be better but square should work well enough ...
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