... used in oil and gas industries, such as drill pipe, petroleum oil pipe, oil and natural gas and so on. Seamless ... of channels for transporting fluids, such as steel pipe and solid steel bar, compared with the same ... in oil and gas industries, such as drill pipe, petroleum oil pipe, oil and natural gas and so on.Product ... wellbore casing.LinepipeA,B,X42,X46,X52,X56,X60,X65,X70,X80 API SPEC 5L,GB/T9711.1, ...