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Fluid pipe is a kind of steel pipe with hollow section and no weld from beginning to end. Making ring parts with steel pipe can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing time, such as rolling bearing ring, jack sleeve, etc. Steel tubes are also indispensable materials for all kinds of conventional weapons. Gun barrels and barrels are made of steel tubes. According to the shape of cross-sectional area, steel pipes can be divided into round pipe and special-shaped pipe. Because of the large area of the circle under the condition of equal perimeter, more fluid can be transported by the round tube.

1、fluid pipe Manufacturing method

① Generally, the service temperature of boiler tubes is below 450 ℃, and the domestic tubes are mainly made of 10 and 20 carbon steel hot rolled or cold drawn tubes.

② High pressure boiler tubes are often used in high temperature and high pressure conditions. Under the action of high temperature flue gas and water vapor, the tubes will be oxidized and corroded. The steel pipe is required to have high endurance strength, high oxidation resistance and corrosion resistance, and good structure stability.

2、 Application of fluid pipe

① General boiler tubes are mainly used to make water wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke tubes and arch brick tubes, etc.

② High pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, gas pipes and main steam pipes of high pressure and ultra-high pressure boilers.

However, the circular tube also has some limitations. For example, under the condition of plane bending, the bending strength of the circular tube is not as strong as that of the square or rectangular tube, and the square or rectangular tube is commonly used in some agricultural machinery skeletons, steel and wood furniture. Special shaped steel pipes with other cross-section shapes are needed according to different uses.