... cross section, a large number of channels for transporting fluids, such as steel pipe and ... cross-section steel, widely used in oil and gas industries, such as drill pipe, petroleum oil ... pipe, oil and natural gas and so on.Product NameGradeStandardVisual and Dimensional ApplicationCasing ... wells to extract oil or natural gas, oil and gas wells for wellbore casing.LinepipeA,B,X42,X46 ...