The theoretical weight of square pipe should be calculated according to the formula:4x wall thickness x (side length - wall thickness) x 7.85. where the side length and wall thickness are in millimeters. Substitute the values directly into the above formula to arrive at the weight in grams per meter of square tube. For example, a 30 x 30 x 2.5mm square tube, its weight per meter can be calculated according to the above formula:4x2.5x(30-2.5)x7.85=275x7.85=2158.75g, that is, about 2.16kg, when the wall thickness and the side length are both measured in millimeters, 4x wall thickness x (side length - wall thickness) calculates the volume of the square tube in meters, the units are Cubic centimeters, and then multiplied by the specific gravity of iron 7.85g a rectangular tube weight formula:2 x (side length 1 + side length 2 - wall thickness) x wall thickness x length x density kg / m calculating the weight of the square tube of the company:4 x wall thickness x (side length - wall thickness) x 7.85kg / m.
Calculation of the weight of round tubes formula: (pipe diameter - wall thickness) x wall thickness x 0.02466kg / m
Square tube is a Q235 hot-rolled or cold-rolled strip or coil as the base material, after cold bending and then high-frequency welding of the cross-section of the shape and size of the square steel. Hot rolled extra thick square tube in addition to wall thickness thickening, corner dimensions and edge straightness to reach or even exceed the level of resistance welding cold bending square tube.