... Certificate: ISO, API Seamless Steel Tubes for low and Medium Pressure BoilersSpecificationsChina StandardSteel GradeStandardseamless steel tubesGB/T8162-199910, ... JIS G3441-1994 JIS G3444-1994Seamless steel tubes and pipes forGB/T8163-199910, 20, Q295, Q345ASTM ... Steel TubesGB3087-199910, 20ASTM A179, ASTM A192for low and Medium Pressure BoilersASTM SA179,SA192, BS3059Seamless Steel TubesGB6479-8610, ...