Straight seam steel pipe

Large-diameter straight seam steel pipe
Straight seam steel pipes with an outer diameter of more than 500mm

Large-diameter straight seam steel pipes refer to straight seam steel pipes with an outer diameter of over 500mm. The maximum diameter of a single weld is 1220mm, and that of a double weld is 2020mm. Each one is 12 meters long.
It adopts the standards of GB/T3091-2008, GB/T9711.1-1997 and API5L. Commonly used materials include Q235A, Q345, X46 and X70.
The production process mainly adopts double-sided submerged arc welding and goes through multiple procedures to meet the standard requirements. It is widely applied in large-scale pipeline projects, water and gas transmission projects, and urban pipeline network construction.
Large-diameter straight seam steel pipes generally refer to straight seam steel pipes with an outer diameter of over 500mm. Currently, the maximum diameter of double welds can reach 2020mm, and that of single welds can reach 1220mm.

Material
The common materials for large-diameter straight seam steel pipes include Q235A, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X70, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, and 0Cr18Ni11Nb

Technological process
Large-diameter straight seam steel pipes are mainly produced by the double-sided submerged arc welding process. The products go through multiple processes such as bending, seam joining, inner welding, outer welding, straightening and flat head, and meet the relevant standard requirements.

Purpose
Large-diameter straight seam steel pipes are the best choice for large-scale pipeline projects, water and gas transmission projects, and urban pipeline network construction. The national West-East Gas Pipeline Project has used 200,000 tons of this type of steel pipe, and the market prospect is broad.