L245-PSL1 Weld Pipe（LSAW）

Product introduction

L245-PSL1 conforms to the standard GB/T 9711 "Steel Pipes for Pipeline Transportation Systems in the Oil and Gas Industry", which is a Chinese national standard and is equivalent to API 5L.L245 PSL1 welded pipes can be manufactured using various welding processes, including high-frequency welding, straight-seam submerged arc welding, and spiral submerged arc welding. This article mainly introduces the manufacturing process of straight-seam submerged arc welding, which is primarily used for pipes with larger diameters and thicker walls. Therefore, in addition to the grade, the manufacturing process usually needs to be specified.

Parameter Table

Chemical elemental composition of L245-PSL1 welded pipe

PSL1 grade has relatively lenient requirements for chemical composition (such as carbon C, manganese Mn, phosphorus P, sulfur S, etc.), mainly ensuring weldability and basic strength.

Manufacturing Process

The manufacturing process of L245-PSL1 straight seam electric arc welded pipe begins with milling pretreatment of steel plates of a specific width (usually using JCOE or UOE forming processes) to ensure the geometric accuracy and cleanliness of the weld area. Subsequently, the steel plate is cold-bent using a multi-step mold, gradually transforming it into an open "O"-shaped pipe. Next, the main weld is performed using internal and external double-wire submerged arc welding technology, where the arc-molten base material under the flux layer and the welding wire form a dense weld. After welding, the pipe body undergoes mechanical expansion to precisely calibrate roundness, eliminate welding stress, and improve the mechanical properties of the weld area. Finally, the weld is subjected to full-length ultrasonic or X-ray non-destructive testing according to standard requirements, and the finished pipe undergoes a hydrostatic test to ensure its pressure integrity and quality meet the specifications for PSL1 level.

About our Company

GNEE Steel Group was established in 2008 and now has 18 years of export experience, mainly exporting steel pipes, steel plates, bars, sections, pipe fittings and valves. We maintain ample inventory in various materials, including copper, aluminum, and galvanized steel. We will provide the products you need based on your required material grade and dimensions, adding value to your project.

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