Seamless steel pipe is a hollow cross-section, no seams around a circular, square, rectangular steel. Seamless steel ingot is made of perforated or solid through the capillary tube, and then by the hot-rolled, cold-rolled or cold call is made. Seamless hollow sections, widely used as transportation and other fluids, steel pipe and solid steel bar compared to the same torsional strength in bending, lighter, is an economic cross-section steel, widely used in the manufacture structure parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle frames and construction using steel scaffolding.