Seamless steel pipe is a hollow cross section, no seams around the circle, square, rectangular steel. Seamless steel tubes which have been perforated or solid steel ingot tube made of the capillary tube, and then hot-rolled, cold-rolled or cold call is made. Seamless steel hollow section with a large number of channels for transporting fluid pipes, steel round solid steel compared to the same torsional strength in bending, lighter, is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle frames and construction using steel scaffolding.