## Calculate thickness of steel square tube

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.
Attached Files
 4X4 square steel tube.pdf (65.7 KB, 41 views)
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 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.
 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.