Thick-walled seamless steel pipe is a kind of hollow cross-section, no seams around the long bar of steel. Steel hollow section with a large number of channels used for transmitting fluids, such as transmission oil, gas, gas, water and some solid materials, pipes and so on. Steel pipe and solid steel round bar, etc.

compared to the same torsional strength in bending, lighter, is an economic cross-section steel, widely used in the manufacture structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle aircraft and construction using steel scaffolding. Ring with a steel pipe manufacturing parts, can improve material utilization, simplify the manufacturing process, saving materials and processing man-hours, such as bearing rings, jack sets, etc., has been widely used to make steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel and other steel to be manufactured. By cross-sectional shape of the pipe can be divided into tube and shaped tube. Since the circumference of the same conditions, the maximum area of a circle, with round pipe can carry more fluid. In addition, the ring cross-section to withstand internal or external radial pressure, the force more evenly, so the vast majority of the pipe is pipe.