High quality oil casing steel pipe

　　Hot-expanding pipes are produced by expanding machine. The technical process is the same as elbow machine. The difference is the pipe mould is straight and pipe elbow have bending radius. The advantage of hot expanding pipes is the low prices and easy to collect the sources. The disadvantage of  the expanding pipes is the wall thickness. The thickness of hot expanding pipes is not as good as hot roll or cold drawn pipes. The tolerance is big but within the American standard.

　　We have adopted advanced production equipment and technologies to manufacture our

　　High quality oil casing steel pipe, which can not only improve product quality, but also  save raw materials. Our products have high strength, good toughness and resistance to corrosion.