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American standard seamless pipe is a long steel with a hollow cross-section and no seams on all sides. American seamless steel pipe has a hollow cross-section and can be used as a pipeline for conveying fluids, such as oil, natural gas, coal gas, water and some solid substances. Compared with solid steel such as round steel, American standard seamless pipe is lighter in weight under the same bending and torsional strength. It is an economical section steel and is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames, steel scaffolding for construction, etc. Using American standard seamless pipe to manufacture annular parts can improve material utilization, simplify manufacturing processes, and save materials and labor hours, such as rolling bearing rings, jack sleeves, etc. At present, steel pipes are widely used in the manufacturing industry. Steel pipes are also indispensable materials for various conventional weapons. Buckets, barrels, etc. must be made of steel pipes. Steel pipes can be divided into round pipes and special-shaped pipes according to the cross-sectional area. The same circumference, the area of the circle is larger, so more fluids can be transported with round pipes. In addition, when the ring cross section is subjected to internal or external radial pressure, the force is uniform, so most steel pipes are round pipes. However, round pipes also have certain limitations. For example, in the case of plane bending, round pipes are not as strong as square and rectangular pipes, which are often used in the skeleton and steel of some agricultural machinery. How to choose a more reliable American standard seamless pipe