Seamless tubes are a type of welded steel pipe, referring to pipes where the weld is parallel to the longitudinal axis of the tube. Categorized by wall thickness, there are thin-walled seamless tubes and thick-walled seamless tubes; by shape, they include round tubes, square tubes, or special-shaped tubes; and by application, they encompass general-purpose welded pipes, galvanized welded pipes, oxygen-blown welded pipes, wire sleeve pipes, metric welded pipes, roller tubes, deep well pump pipes, automotive tubes, transformer tubes, welding thin-walled pipes, welding special-shaped pipes, and spiral-welded pipes.