Jiangsu Changbao Steeltube Co., Ltd. manufactures and sells steel tubes in China and internationally. Its product range includes connection tubing and casings, coupling stocks, perforation gun carrier pipes, petroleum tool pipes, drill and green pipes, slotted pipes, boiler tubes, water heater and U-bended tubes, automotive precision tubes, hydraulic cylinder piping, axel tubes, petrochemical tubes, low-temperature-resistant tubes, high-pressure fertilizer tubes, mechanical steel pipes, boom pipes, line pipes, geological drilling pipes, core barrels, rope coring drill pipe materials, gas cylinder pipes, and accumulator tubes. The company also supplies steel pipes for marine engineering, structural purposes, and fluid transmission. Founded in 1958, it is based in Changzhou, China.