In our lives, no matter where we are, we can see steel-insulated steel pipes. However, everyone’s understanding of steel pipes is really narrow, and there is only one kind of steel pipe.In fact, there are two types of steel pipes used in our lives, namely, steel sleeve steel insulation steel pipes

Carbon steel pipes with square and rectangular (rectangular) cross-sections:　　 Weight unit per meter: kg/m (kilogram/meter) & lb/ft (lb/ft)　Commonly used square tube calculation formula 1:　　(Length + width)×2÷3.14-thickness×thickness×0.02466= kg/m　　 Formula 2:　　Kg/m = (Oc-4Wt) * Wt * 0.00785