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The galvanized steel pipe is one kind pipe which has the hollow section, and have no juncture strip on the peripheral .Welded steel pipe which is made by the curly steel plate or coil after moudling.The production process is simple .with the character of high production efficiency,variety specification ,and less equipment but general intensity below seamless steel tube.LSAW steel pipe has the same characters of welded steel pipe ,and the general intensity is higher than the welded steel pipe .Can use the narrow coil material to product the bigger diameter welded steel pipe .also can use the same wide coil material to product different diameter .Compared to the welded steel pipe ,with the same length,the welding line is increase 30~100%. And the production speed is lower than welded pipe.So,the small difference of welded steel pipe we also applied the straight welded .the bigger diameter welded pipe applied spiral welding.With the oil industry, oil and gas pipeline with its economic security, their professionalism, efficient and rapid development. Long-distance, large diameter, high pressure is becoming onshore oil and gas pipeline development, pipeline steel X56-X70 series of high-strength steel has been widely used in pipeline construction,welded pipe cold crack（natural gas pipeline)from a single tube assembly connected together by the root. Modern gas gathering pipelines and gas pipelines from the pipe connection is made by welding. Seamless steel pipe with spiral seam pipe, straight seam tube(line pipe) variety, for seamless pipe 529 mm below the pipe, straight seam tube and spiral seam pipe for large diameter pipes.