Seamless steel pipes are钢管 made by piercing a solid round steel billet, featuring no welds on the surface and are known as seamless steel pipes. They can be categorized into hot-rolled, cold-rolled, cold drawn, extruded, and jacking seamless steel pipes based on the production method. According to the cross-sectional shape, they are divided into round and non-round types, with non-round shapes including square, elliptical, triangular, hexagonal, pumpkin-shaped, star-shaped, and winged pipes, among others. The diameter ranges from 4mm to 900mm. Depending on the 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.