Seamless steel tubes is a kind of strip steel with a hollow section and no surrounding joint, and they are widely used in industrial field.Seamless steel pipe with hollow section can be used as pipelines conveying fluid, such as conveying oil, natural gas, coal gas, water and some solid materials. Compared with solid steel, when with the same torsional strength, the weight of seamless steel pipe is light, so it is a kind of economic section steel. They are widely used in the manufacture of structural parts and mechanical parts, such as the oil drill pipe, automobile transmission shaft, the bicycle frame and scaffold. Manufacturing circular parts such as rolling bearing ferrule with seamless steel tube can improve the utilization rate of material, simplify the manufacturing process, and save the material and working hours. And seamless steel pipes are also the indispensable material of all kinds of conventional weapons, such as the barrel and so on.