X65 LSAW Pipes

Why can LSAW tubes withstand extreme tests?

The core reason why LSAW tube can stand in extreme scenes such as high pressure and low temperature lies in the mechanical properties advantages brought by its straight seam structure. According to the test data of CNAS Certification Laboratory of Huayang Steel Pipe, under the same specification (DN300, wall thickness 10mm), the axial tensile strength of LSAW pipe is 570MPa, and the yield strength is 345MPa, while the axial tensile strength of SSAW pipe is only 500MPa, which is particularly critical in high-pressure scenarios.

In a deep-sea exploitation project in Bohai Oilfield in 2023, DN600 LSAW pipe supplied by Huayang has to bear the deep-sea high pressure of 10MPa (equivalent to the pressure of 1000 meters water depth) and cope with the low temperature environment of -20℃. The test data show that the weld impact toughness of this batch of pipes reaches 42J, far exceeding the 30J required by the project. It has been kept under pressure for 1 hour at 1.5 times the working pressure without any leakage, and passed the third-party test at one time. "Straight seams are consistent with the direction of stress and can evenly transmit axial pressure, which is an inherent advantage that spiral slotted pipes cannot replace." In terms of corrosion resistance, Huayang LSAW tube also performed well. In view of the high sulfide soil environment in Central Asia, the LSAW pipe customized by Huayang for local energy projects adopts the process of "sandblasting rust removal +3PE corrosion protection", and the thickness of the corrosion protection layer is 2.5mm, which has been verified by salt spray test and can run stably in high corrosive environment for more than 20 years. The 50-kilometer LSAW pipe sent to Uzbekistan in 2024 has successfully passed the rigorous local anti-corrosion performance test and will soon be put into use in oil field oil pipelines.