1. seamless pipe for coupling. 2.seamless pipe for oil casing,tubing. 3.for structure. standerdAPI5L,GB,ISO,ASTMUSAGEused for canveyance of water oil,coupling,gas.SIZEOD;20MM-114MM,THICKNESS;2MM-8MMSURFACEBARE ,vanish,coating,or client's needSTEEL GRADEQ195 Q235 ,A106, N80 AND SO ON .PACKINGIN boudles. loss. client option. seamless oil pipe