... 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 ... oil wells to extract oil or natural gas, oil and gas wells for wellbore casing.LinepipeA,B, ... GB/T9711.232-1240*3-100For oil and gas industry, oxygen, water and oil in the short-distance ...