API 5L X42 PSL1 LSAW - Basic-grade Line Pipe
Product introduction
API 5L X42 PSL1 Straight Seam Welded Pipe (LSAW) is a basic-grade pipeline pipe with a nominal minimum yield strength of 42,000 psi (290 MPa). This product is made from rolled steel plates and manufactured with a straight seam weld using submerged arc welding, exhibiting excellent roundness and wall thickness uniformity. It is suitable for non-harsh applications such as onshore oil and gas gathering and transportation networks, low-pressure fluid transportation pipelines, and structural supports, where operating pressures are moderate and low-temperature toughness requirements are not particularly stringent.
Parameter composition performance
PSL1 has relatively lenient requirements for chemical composition, typically only specifying the maximum content of elements such as carbon, sulfur, and phosphorus, unlike PSL2 which has strict carbon equivalent limits and more trace element requirements,this simplifies its production process.
| Condition | Tensile strength σb Mpa |
Yield point σs Mpa |
Elongation or stretching after fracture δ % |
|---|---|---|---|
| Seamless pipe, welded pipe | ≥415 | ≥290 | * |
Heat treatment process
The most common heat treatment method is used when the post-weld performance (especially toughness) does not meet the requirements or when the user has specific toughness specifications.
The normalizing heat treatment process for API 5L X42 PSL1 straight seam welded pipe mainly includes three key stages: heating, holding, and cooling. First, the welded steel pipe is uniformly heated at a controllable rate to the austenitizing temperature above the Ac₃ phase transformation point (typically approximately 900°C - 930°C). Then, it is held at this temperature for a sufficient time to allow the pipe microstructure to completely transform into uniform austenite and eliminate residual stress from the welding process. Finally, the steel pipe is removed from the furnace and uniformly cooled in still air, resulting in a pearlite-ferrite microstructure with refined grains and a uniform microstructure. This process effectively improves the mechanical properties of the weld and the base material, making them more tough and eliminating the adverse effects of the weld heat-affected zone.
About us
Established in 2008 and located in the ancient capital of Anyang, Henan Province, GNEE Steel Group primarily engages in export trade, offering "one-stop service for customer peace of mind." With 18 years of experience in foreign trade exports, GNEE Group serves clients overseas. Our steel products, including steel pipes and plates, are exported in large volumes, are of reliable quality, and have received repeat purchases from many customers. For the API 5L Gr.B grade, our production technology is highly mature, we maintain ample inventory, ensuring sufficient supply and easy procurement for our customers.
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