Seamless steel tubes feature a hollow cross-section and are extensively used as pipelines for conveying fluids such as oil, gas, water, and certain solid materials. Compared to solid steel products like round bars, seamless steel tubes offer the same bending and torsional strength but with a lighter weight, making them an economical choice for structural and mechanical components like oil drill pipes, automotive propshafts, bicycle frames, and steel scaffolding used in construction. Manufacturing ring-shaped parts from these tubes improves material efficiency, simplifies production processes, saves materials and labor, and has thus become widely employed.