... -273mm, 4-13mmWall lining for oil wellsERW Steel PipeQ195-Q345ASTM, GB0.8-12mm,19-275mmMainly used in petroluem,chemical,power,gas,water ... Steel PipeQ195-Q235GB,ASTM20-165mm,0.5-16mmWidely used in the construction,pipe of industrial,water pipe,fence equipment,telecommunication tubes as ... N80,etcGB,ASTM,API5L2.1-110mm,10.3-508mmUsed in oil & gas fieldsWelded Steel Pipe10#,20#,45#,Q195,Q215,Q235,Q345 ...