Seamless steel tubes, made from a solid piece of metal with no joints on the surface. According to the production method, seamless tubes are categorized into hot-rolled, cold-rolled, cold drawn, extruded, and jacking tubes. In terms of cross-sectional shape, they are divided into round and non-round types, with non-round shapes including square, elliptical, triangular, hexagonal, pumpkin, star-shaped, and winged tubes. The maximum diameter reaches 650mm, and the minimum diameter is 0.3mm. Depending on their application, they are available in thick-walled and thin-walled versions. Seamless steel tubes are primarily used for oil and gas geological drilling pipes, cracking pipes for petrochemical use, boiler tubes, bearing tubes, and high-precision structural steel tubes for automotive, tractor, and aviation use.