How much does a square pipe of 400*200* 15 (mm) weigh per meter?

(40+90) × 2 ÷1000×1× 3 ÷1000× 7.8 = 0.0055224 tons =5.5224 kilograms, which is approximately equal to1/kloc-. Here, 3 indicates that the square pipe thickness is 3 mm (3 is my hypothetical data, and the general square pipe thickness is 1 mm, 2 mm, 3 mm, etc.