Calculated to control weight

4xWall thicknessx(Side-Wall thickness)x7.85

Among them, the side length and thickness are in millimeters as a unit, directly into the above-mentioned numerical formula is derived for each square meter of the weight, in grams.

4x2.5x(30-2.5)x7.85=275x7.85=2158.75g，about 2.16kg

When the wall thickness and length are in millimeters when, 4x wall thickness x (side length - thickness) is calculated per meter of pipe length to the size of a cubic centimeter as a unit, and then multiplied by the proportion of iron per cubic centimeter 7.85 grams, which is drawn tube per meter square in grams of weight.