Calculate thickness of steel square tube

[manu_vmv]

I want to design a welded structure steel stand to hold the weight of 600 pounds, by using 4X4 square tube. Please help me to find the thickness of steel tube.

[edgepflow]

Use basic beam formulas for stress and deflection based on your loading style. Establish limits on these.

The thickness of the beam will increase the section modulus and decrease the stress and deflection. Choose a thickness to meet your stress and deflection limits.

[polymerou]

I think he is asking to calculate him the value, not the way he will solve it.

If it is so, you must give us some more info, like the distance between those two square tubes (36.2) on the top, and the dimensions and distances of the ribs.

That's all I can think for now.

[manu_vmv]

Thanks for the reply.
The distance between top two square tube is 397 mm(ceter to center). A plate 10 mm thick is place over the tube. So the entire weight is acted on the plate.

[polymerou]

3mm thick is enough. I considered it by using galvanized steel with yield strength of 200GPa