... 12CrMo 15CrMo 15Cr2Mo 1Cr5MoGB6479-200025-426mm, 6-40mmMainly used in chemical equipment,fertilizer equipment and pipelines under high pressure or high tempretureOil ... , 4-13mmWall lining for oil wellsERW Steel PipeQ195-Q345ASTM, GB0.8-12mm,19-275mmMainly used in petroluem,chemical,power,gas ... N80,etcGB,ASTM,API5L2.1-110mm,10.3-508mmUsed in oil & gas fieldsWelded Steel Pipe10#,20#,45#,Q195,Q215,Q235 ...