... -X70,API5L GrB,etc.4) Application:Structural pipe,liquid transportation,conveyance of oil and gas,petroleum transportation etc.5) Marking:the sizes ... -X70,API5L GrB,etc.4) Application:Structural pipe,liquid transportation,conveyance of oil and gas,petroleum transportation etc.5) Marking:the sizes ... marked on the pipe6) Process mold:LSAW mold Oil and gas transportation LSAW pipeline