... AWWA / DIN / BS / JIS and etc. 2.Material: Carbon Steel, Alloy Steel Materials:Q235B,Q345B,ASTM A53GrB, X42-X70,etc.1 ... API5L GrB,etc.4) Application:Structural pipe,liquid transportation,conveyance of oil and gas,petroleum transportation etc.5) Marking:the sizes, ... GrB,etc.4) Application:Structural pipe,liquid transportation,conveyance of oil and gas,petroleum transportation etc.5) Marking:the sizes, ...