... Tube and pipe (Thick-wall)AlloyTemperWall Thickness(mm)Width(mm)Adopted standard1*,3*,5*8*H112,O,F5-4020-180GB/T4437.1GJB2381 GB ... Tube and pipe (Thin-wall)AlloyTemperWall Thickness(mm)Width(mm)Adopted standard1*,3*,5*O,H14,H34,H320.5-56-130GB/T6893 ... Tube and pipe (Thick-wall)AlloyTemperWall Thickness(mm)Width(mm)Adopted standard1*,3*,5*8*H112,O,F5-4020-180 GB/T4437.1GJB2381 ...