Seamless steel tube

Seamless steel tubes are made by piercing a solid round steel billet, which are tubes without any visible welds on their surface. According to the production method, seamless steel tubes can be categorized into hot-rolled, cold-rolled, cold drawn, extruded, and jacking types. In terms of cross-sectional shape, they are divided into round and non-round tubes. Non-round tubes come in various shapes such as square, elliptical, triangular, hexagonal, melon-shaped, star-shaped, and winged tubes. The diameter ranges from 4mm to 900mm. Depending on their applications, there are thick-walled and thin-walled seamless steel tubes. Seamless steel tubes are primarily used for oil and gas geological drilling pipes, cracking pipes for petrochemicals, boiler tubes, bearing tubes, and high-precision structural steel tubes for automotive, tractor, and aviation use.