Large diameter steel pipe

Large diameter steel pipe generally refers to OD over 500 mm diameter straight seam steel pipe, for now the biggest diameter can reach 2020 mm, single seam weld maximum diameter is 1220 mm.

Standard
Domestic usually adopt GB/T3091-2008、GB/T9711.1-1997、API 5L standard 。

General material:

Q235A、Q235B、16Mn、20#、Q345、L245、L290、X42、X46、X70、X80、0Cr13、1Cr17、00Cr19Ni11、1Cr18Ni9、0Cr18Ni11Nb

Size: 

∮325×8-20	∮426×8-30	∮508×8-40	∮660×8-50
∮351×8-25	∮450×8-40	∮530×8-40	∮711×8-50
∮355×8-25	∮457×8-40	∮560×8-40	∮720×8-50
∮377×8-25	∮478×8-40	∮580×8-40	∮820×8-50
∮400×8-30	∮480×8-40	∮600×8-50	∮920×8-50
∮402×8-30	∮490×8-40	∮610×8-50	∮1020×8-60
∮406×8-30	∮500×8-40	∮630×8-50	∮1220×9-60