These are steel line pipes defined under the American Petroleum Institute’s 5L specification, specifically designed for transporting oil, gas, and water. The “X52” grade refers to the pipe's minimum yield strength of 52,000 psi. They are available in both seamless and welded forms and are manufactured in PSL1 and PSL2 quality levels depending on service requirements. As leading API 5L... https://www.carbonsteelspipe.com/api-5l-x52-pipes-manufacturers-exporters-suppliers-stockists.html