The fluid tube is a hollow section with no welds from start to finish. The steel pipe has a hollow section and is used as a pipe for conveying fluid, which transports oil, natural gas, gas, water and some solid materials. Compared with lsaw steel pipe, the fluid tube is lighter in weight when it has the same bending and torsional strength. It is an economical section steel and is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycles. Shelf and steel scaffolding used in construction.
The use of steel pipes to manufacture ring-shaped parts can improve material utilization, simplify manufacturing processes, save materials and processing man-hours, such as rolling bearing rings, jack sleeves, etc., and have been widely used in steel pipes. Steel pipes are also indispensable materials for various conventional weapons, and many of them are made of steel pipes. Steel pipes can be divided into round pipes and shaped pipes according to the shape of the cross-sectional area. Since the area of ​​the circle is the largest under the condition of equal circumference, more fluid can be transported by the circular tube. In addition, the circular section is subjected to a relatively uniform force when subjected to internal or external radial pressure, and therefore, most of the steel pipes are round pipes.
The high pressure boiler tube is a type of boiler tube and belongs to the category of seamless steel pipes. The manufacturing method is the same as that of the seamless pipe, but there are strict requirements for the steel used in the manufacture of the steel pipe. High-pressure boiler tubes are often subjected to high temperature and high pressure conditions, and the tubes may oxidize and corrode under the action of high temperature flue gas and water vapor. Steel pipes are required to have high durability, high corrosion resistance and good structural stability. High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air guiding tubes, main steam tubes, etc. for high-pressure and ultra-high pressure boilers.
Low and medium pressure boiler tube GB3087-1999, high pressure boiler tube GB5310-1999 is used for manufacturing superheated steam pipes, boiling water pipes and locomotive boiler superheated steam pipes, large smoke pipes, small smoke pipes and arch brick pipes for various structures. High quality carbon structural steel hot rolled and cold drawn (rolled) seamless steel tubes. Structural seamless steel pipe (GB/T8162-1999) is a seamless steel pipe used for general structural and mechanical structures. Specification and appearance quality: GB5310-95 “Seamless steel pipe for high-pressure boiler” hot-rolled pipe has an outer diameter of 22 to 530mm and a wall thickness of 20 to 70mm. The cold drawn (cold rolled) tube has an outer diameter of 10 to 108 mm and a wall thickness of 2.0 to 13.0 mm.
The profiled seamless steel pipe is a general term for seamless steel pipes of other cross-sectional shapes other than round pipes. According to the shape and size of the cross-section of the steel pipe, it can be divided into the same wall thickness profiled seamless steel pipe (code D), the unequal wall thickness profiled seamless steel pipe (code BD), and the variable diameter profiled seamless steel pipe (code BJ). Shaped seamless tubes are widely used in a variety of structural parts, tools and mechanical parts. Compared with the round pipe, the special-shaped pipe generally has a large moment of inertia and a section modulus, and has a large bending and torsion resistance, which can greatly reduce the structural weight and save steel.