Specifications of welded pipes(tubes)

Size: (Size can be customized.)
Outer Diameter 400mm-3048mm
Wall Thickness 5.0mm-25.4mm
Length 6-30 meters/pc, or as required.

Standard:  

GB/T3091-2015, GB/T9711-2017, SY5037-2000ASTM A1053/A1053M-06, A268/A268M-05A, A269-07 A270-03A, A312/A312M-06, A358/A358M-05, A632-04 A789/A789M-05b, A790/A790M-05b, A872/A872M-07A, A949/A949M-01(2005).

ASTM: B725 B730 B516 B517 B704 B705 B514 B515 B619 B626 B464 B468 B521 B523 B858 B862

Materials available: 

ss304, ss316, ss2205, Alloy200, Alloy201, Alloy400, AlloyK500, Alloy600, Alloy625, Alloy718, Alloy800, Alloy800H, Alloy800HT, Alloy825, AlloyC276, AlloyC22,, AlloyB2, AlloyB3, Alloy59, Alloy20, etc.

Production Processes

welded pipe can be divided into spiral submerged arc welded pipe, straight seam double-sided submerged arc welded pipe and resistance welded pipe.

1. 1. The production process of spiral steel pipe: The raw materials of spiral steel pipe are strip steel coil, welding wire and flux. Before forming, the strip steel is leveled, trimmed, planed, cleaned, transported and pre-bent. The weld gap control device is used to ensure that the weld gap meets the welding requirements, and the pipe diameter, misalignment and weld gap are strictly controlled. After cutting a single steel pipe, the first three of each batch of steel pipes shall be subject to a strict first inspection system to check the mechanical properties, chemical composition, fusion condition, surface quality of steel pipes, and NDT inspection to ensure that the pipe manufacturing process is qualified before they can be officially put into production.

1. 1. LSAW pipe: The forming methods of LSAW pipe include uo (UOE), Rb (RBE), JCO (JCOE), etc.
      The forming process of UOE longitudinal submerged arc welded pipe mainly includes three forming processes: steel plate pre bending, u forming and O forming. Each process uses a special forming press to complete the three processes of steel plate edge pre bending, u forming and O forming in order to deform the steel plate into a circular tube. The forming process of JCOE longitudinal submerged arc welded pipe: in jc0 After repeated stamping on the forming machine, the first half of the steel plate is pressed into a J shape, and then the other half of the steel plate is pressed into a J shape to form a C shape.

1. 1. Straight seam high frequency welded pipe: The straight seam high frequency welded pipe (ERW) is formed by heating the edge of the tube billet with the skin effect and proximity effect of high frequency current after the hot rolled coil is shaped by the forming machine, and then pressure welding is carried out under the action of the extrusion roller.