Seamless steel pipes are钢管 made by piercing a solid round steel billet, which have no weld seams on their surface and are known as seamless pipes. According to the production method, seamless steel pipes can be categorized into hot-rolled, cold-rolled, cold drawn, extruded, and jacked types. In terms of cross-sectional shape, they are divided into circular and non-circular, with non-circular shapes including square, elliptical, triangular, hexagonal, pumpkin-shaped, star-shaped, and winged pipes, among others. The diameter ranges from 4mm to 900mm. Depending on their application, there are thick-walled and thin-walled seamless steel pipes. Seamless steel pipes are primarily used for oil and gas geological drilling pipes, cracking pipes for petrochemical use, boiler tubes, bearing tubes, and high-precision structural steel pipes for automotive, tractor, and aviation applications.