Seamless steel pipe has a hollow section and they are widely used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and some solid materials.

Calculation formula for calculating the theoretical weight of common profiles:

m=F×L×ρ

m—quality Kg; F—cross-sectional area m2; L—length m; ρ—density*Kg/m3

Noted: F calculation method of cross-sectional area:

1. Square steel tube: F= a2

2. Steel pipe: F=3.1416×$(D-$) 

D—diameter $—thickness

3. Steel plate, flat steel: F= a×$ a—width