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Mechanical steel tube is widely used in the manufacture of circular parts, it can improve the utilization rate of materials, simplify the manufacturing process, the material and the processing time, such as rolling bearing circle, etc. According to the cross-sectional area of different shapes can be divided into circle pipe and different type pipe. Due to the conditionsthe circle area is the largest, and the round pipe can be transported more liquid.
Circle section is subjected to internal or external diameter pressure, the force is more uniform, therefore, most of the steel pipe is the circle pipe.