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