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　　Fluid pipe is a kind of pipe with hollow cross section and no weld from beginning to end. Fluid pipe has hollow section, which is widely used as pipeline to transport oil, natural gas, gas, water and some solid materials. Compared with solid steels such as round steel, steel pipe has lighter weight when its bending and torsional strength is the same. It is an economic section steel. It is widely used in manufacturing structural and mechanical parts, such as ASTM S53 Seamless Stainless Steel Fluid Pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction.

　　Because of its low cost and high strength, steel pipe has been widely used in fluid transportation in modern society. In the past, fluid pipe were traditionally used in fluid pipes. With the development and progress of material science, forming technology and equipment, fluid pipe have been greatly developed. Fluid pipe has the advantages of better uniformity, higher accuracy, less energy consumption and higher production efficiency than seamless pipe. In the past, almost 100% of fluid pipe was used. Today, in the developed countries of America, Japan and Europe, more than 95% of seamless pipe has been replaced by fluid pipe.

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