The industrial production of seamless steel pipes mainly follows two routes: one is the piercing-rolling method(Bias rolling / Mannesmann type), and the other is the extrusion method (hot/cold extrusion). Each has its own process flow, advantages, and applicable scenarios. Understanding the differences helps in selecting the appropriate pipe material for different applications.Metal has built a closed-loop quality system from factory to site by integrating raw material inspection, production process control, non-destructive testing, disinfectant and preservative treatment, and on-site processing. For samples of seamless steel pipe or technical support for inspection items, please contact us for customized solutions and quotations.