http://www.besdrill.com/tubing-and-casing/ China Tubing And Casing factory Product Details Quick Details Standard:API, ASTM, BS, DIN, GB, JISStandard2:API 5CT, API 5L, API 5DP, ASTM A106-2006, ASTM A213-2001... Grade Group:10#-45#, 16Mn, A53-A369, API J55-API P110, Q195-Q345, ST35-ST52Grade:20#, 45#, 16Mn, A106(B,C), A312, A335 P5... Thickness:1 - 50 mm mmSection Shape:Round Outer Diameter(Round):20 - 1500 mm mmPlace of Origin:China Application:Gas PipeTechnique:EFW Certification:APISurface Treatment:coated Special Pipe:API PipeAlloy Or Not:Non-alloy Secondary Or Not:Non-secondaryProduct name:Gas Pipeline Type:Seamless Round Steel P