Reinforced connection sleeve wholesale suppliers Liaocheng ATEN company producing precision seamless steel tubes are GB GB / T3639-2008 implementation of the standards; the company selected high-quality production of raw materials; production materials are : 10 # 20 # 35 # 45 # 20cr 40cr gcr15 as the blank finishing or cold drawn together. our company produces precision seamless notable feature is the high-precision, high-quality, high-quality finish, the steel pipe outer wall size precision, excellent mechanical process performance, a wide range of precision seamless applied to the needs of the automotive, motorcycle, electric cars damping, construction steel, precision machining, precision cylinders, power, shipbuilding, bearings, etc., and low-pressure pipe .