... fertilizer equipment,high pressure boiler,low & mid-pressure boiler,etc.Stainless Steel Pipe300 SeriesGB,JIS,ASTM, DIN6-720mm, 0.5-65mmWidely used ... N80, API P110GB9948-2000114-273mm, 4-13mmWall lining for oil wellsERW Steel PipeQ195-Q345ASTM, GB0.8-12mm,19-275mmMainly used in petroluem ... etcGB,ASTM,API5L2.1-110mm,10.3-508mmUsed in oil & gas fieldsWelded Steel Pipe10#,20#,45#,Q195,Q215,Q235,Q345,etcGB, ...