Made from high-quality round steel billets through processes such as perforation, hot rolling, cold rolling, cold drawing, or hot expansion, this hollow long strip steel has no welding seams. It has the characteristics of uniform pipe wall, high strength, good sealing, high pressure resistance, and corrosion resistance, and is widely used in the fields of petroleum, chemical, power, boiler, machinery, shipbuilding, municipal engineering, etc. It is a key pipe material for industrial foundations.