... ,low & mid-pressure boiler,etc.Stainless Steel Pipe300 SeriesGB,JIS,ASTM, DIN6-720mm, 0.5-65mmWidely used in made mechamical parts and engeenering ... lining for oil wellsERW Steel PipeQ195-Q345ASTM, GB0.8-12mm,19-275mmMainly used in petroluem,chemical,power,gas,water,shipbuiding,construction,etcLow & mid ...