material:GB10#,20#,45# ASTM A106,ASTM A179 Carbon steel pipesMaterialGB10#,20#,45#,20G,Q345B,27SiMn,15CrMoU,12CrMoU,20CrMo,35CrMo, ... , fluid pipe, boiler pipe, oil pipe ,gas pipe ,API pipe ,alloy steel pipePICTURES FOR YOU ASTM A 179/ASTM A106 carbon steel pipe