... Steel Pipe/Tubes (RHS/ SHS). As the profeesional steel pipes and pipe fittings manufacture in China,we cansupply straight seam steel pipe,spiral steel pipe,seamless steel pipe, ... , customization)Material : Q195-Q345, GR.A,GR.B, ASTM.A53,10#,20#,30#.ETC.Standard: GB3091-2001,GB/T ... 9711.2, ASTM A53, ASTM A106 EN10216,EN10219, ETC.Surface treatment: galvanized, oil, ...