1.material:Q195, Q235, Q345,16Mn 2.Surface treatment:HDG or original 3.product grade: A 4.high quality and best price Seamless steel pipe/seamless pipe/steel tube(1)Surface treatment:HDG, anti-rust varnish, anti-rust oil, (2)Standard:ASTM A106,ASTM A53,API-5L,API5CT,GB/T8163,GB/T8162.(3)Steel grade:Q235,Q345,/ST37,ST51STEEL ROUND PIPE SIZE-OD IN INCH N MM MATCH TABLE AND PER WEIGHT TABLE Pipe OD ...