Oil pipe (GB9948-88) is suitable for the oil refinery furnace tubes, heat exchangers and pipe seamless steel pipe. Geological drilling pipe (YB235-70) for geological department of the core drilling tubes to be used by applications can be divided into the drill pipe, drill collars, core pipe, casing and precipitation tubes. Oil pipe is a hollow cross-section, no seams around the long bar of steel, oil cracking pipe is an economic cross-section steel.