PSL1 L390 Straight Seam Electric Arc Welded Pipe
Product introduction
L390 (X56) LSAW steel pipe is a medium-strength pipeline steel with a good balance of strength and toughness. It can withstand certain internal pressure and has a certain resistance to deformation. As an LSAW steel pipe, its weld quality is high and its performance is comparable to that of the base material, making it reliable for medium and high pressure transmission environments.
Heat Treatment Processing
PSL1 L390 LSAW steel pipes typically undergo normalizing as their final heat treatment process. This involves heating the welded pipe body to its austenitizing temperature (approximately 910-930℃) above the Ac₃ phase transformation point and holding it at that temperature to allow the microstructure to completely recrystallize into a uniform austenite. The pipe is then uniformly cooled in still air. This process aims to eliminate residual welding stress, refine the grain size, and improve the microstructure of the weld, heat-affected zone, and base metal. This results in uniform and stable mechanical properties, ensuring that the specified minimum yield strength meets the requirement of 390 MPa, while also improving plasticity and toughness.
Main technical parameters
| project | Parameters/Requirements |
|---|---|
| Standards | API SPEC 5L (Line Pipe Specification) |
| Minimum yield strength | ≥ 390 MPa (56,500 psi) |
| Minimum tensile strength | ≥ 490 MPa (71,000 psi) |
| Yield ratio | ≤ 0.93 |
| Chemical composition | According to API 5L PSL1 standard requirements |
| Impact toughness | No mandatory requirement generally |
| Heat treatment condition | Usually as-welded or normallyized as required |
| Non-destructive testing | Welds must undergo 100% ultrasonic testing (UT) or radiographic testing (RT) |
About our Company
GNEE Steel Group is a trading company primarily engaged in the export trade of steel products. We are also an agent for leading domestic steel mills, providing high-quality steel products and customizing processes such as cutting and welding according to project requirements to meet various needs.
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