Steel pipe as many production and processing machinery, the main raw material, during use is particularly important, especially in precision steel tubes for automobile parts, must pass professional inspection and processing, to practice with scientific thinking, is the hard truth. Steel pipe manufacturing ring parts can increase material utilization, simplifying the manufacturing process, saving material and processing time, such as Jack and bearing rings, has been widely used to make. Steel or a variety of indispensable materials of conventional arms, the barrel, the barrel must steel pipe manufacturing. Pipe cross sectional area can be divided into different shapes round tube and tube. Steel hollow sections, large pipes used as transmission fluid, such as oil, natural gas, coal gas, water, some solid material piping and so on. Steel and solid steel round bar compared to resistance to bending and torsional strength is the same as light in weight, is a kind of economic section steel, widely used in the manufacture of structural components and mechanical parts, such as drill, propeller shafts, bike racks and construction steel scaffolding used in the construction.