ASTM A53 , A106 HR ERW Piping / Steel ERW Structural Pipe With DIN1626 , 2448 , JIS , BS Standard

HR / Hot Rolled Round Welded Steel Pipe / Thin Wall ERW Steel Tube For Glass Curtain Wall

ST52 , ASTM A53 Round Welded Steel Pipe / Tube Thick Wall For Water / Gas / Oil

Q195 , Q235 , Q345B , Erw Welded Steel Pipe / Hot Rolled Tubing for Construction