Spiral pipe also has its own shortcomings, spiral steel pipe hollow section with a large number of channels for transporting fluids, such as the transportation of oil, natural gas, coal gas, water and some solid materials, pipes and so on. Steel pipe and solid steel bar, etc. compared to the same torsional strength in bending, lighter, which is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as piling pipe, automotive drive shafts, bicycle rack and construction using steel scaffolding.
With steel pipe manufacturing annular parts, can improve material utilization, simplify the manufacturing process, saving material and machining time, such as bearing rings, jack sets, has been widely used to make steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel, etc. to make steel. By cross-sectional shape of the pipe can be divided into tube and shaped tubes. Since the perimeter of equal conditions, the maximum area of a circle with a circular tube can carry more fluid. In addition, the circular cross section to withstand internal or external radial pressure, the force is uniform, so the vast majority of the pipe is pipe.
However, the tube also has some limitations, such as by plane bending conditions, the tube is not as good as square, rectangular tube bending strength, some of the farm skeleton, steel and wood furniture to common square and rectangular pipes. According to different uses should also have other cross-sectional shapes of the shaped pipe.
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