... structure Seamless steel pipe/seamless pipe/steel tube(1)Surface treatment:coated black, anti-rust varnish, anti-rust oil,(2)Standard:ASTM A106,ASTM A53,API ... -5L,API5CT,GB/T8163,GB/T8162.(3)Steel grade:Q235,Q345,STEEL ROUND PIPE SIZE-OD IN ... INCH N MM MATCH TABLE AND PER WEIGHT TABLE Pipe OD ...