Cold-drawn shaped steel tubes

1. Definition and Overview

1. Special-shaped pipes refer to various pipes with non-circular cross-sections. Their shapes are irregular and different from ordinary round pipes. Special-shaped pipes can be made through a variety of processing techniques, such as cold bending, extrusion, etc. Its shape design is to meet specific engineering or industrial needs, such as better fluid mechanics performance, greater structural strength or special space adaptability.

2. Common shapes and characteristics

1. Rectangular shaped tube

1. Shape Description: It has four right angles, and the four sides can be equal length (square shaped tube) or unequal length. Its cross-sectional shape is rectangular, which is one of the more common shaped tube shapes.

2. Features：It is widely used in building structures, such as the frame of building curtain walls. The rectangular cross-section can provide a large plane contact area, which is convenient for connection with other building components (such as glass, plates, etc.). When subjected to pressure or tension in the plane, its force performance is relatively stable. In addition, the rectangular special-shaped tube has a high space utilization rate and can better meet the design requirements in some occasions that require space shape (such as the shell frame of the equipment).

2. Oval shaped tube

1. Shape Description: Its cross-sectional shape is oval, which is a shape between a circle and a rectangle.

2. Features: It has certain advantages in fluid transportation. Compared with round tubes, oval shaped tubes can make better use of space in some installation space-constrained situations while maintaining relatively smooth fluid flow characteristics. For example, in the exhaust system of a car, the oval shaped tube can effectively guide the exhaust gas without taking up too much chassis space, and the fluid resistance inside it is relatively small, which is conducive to improving exhaust efficiency.

3. Hexagonal Shaped Tube

1. Shape Description: The cross-sectional shape is hexagonal, with six sides and six corners.

2. Features: It has high structural stability. Multiple hexagonal special-shaped tubes can be closely spliced together to form a honeycomb structure, which is widely used in aerospace, construction and other fields. For example, in the internal structure of an aircraft wing, the structure spliced with hexagonal special-shaped tubes can reduce the weight of the structure while ensuring strength, because this structure can effectively disperse the force and improve the utilization efficiency of materials.

4. Special-shaped channel steel(Can be regarded as a special shaped tube)

1. Shape Description: Similar to ordinary channel steel, but the shape may be more complex, such as having an asymmetric channel shape, with reinforcing ribs or special bends.

2. Features：Used as a load-bearing member in mechanical manufacturing and building structures. Its special shape can increase the moment of inertia of the cross section, thereby improving the bending resistance. For example, in the frame structure of some large mechanical equipment, special-shaped channel steel can be used as a support beam to bear the heavy weight of the equipment and the working load. At the same time, its special shape can also facilitate the installation and fixation of other components.

3. Manufacturing process

1. Cold Forming：This is one of the common processes for manufacturing special-shaped tubes. The steel strip or steel plate is passed through a series of rollers, gradually bent and deformed at room temperature, and finally formed into the desired special-shaped tube shape. The advantages of this process are high production efficiency, low cost, and the ability to manufacture special-shaped tubes with complex shapes. However, cold bending may have a certain impact on the performance of the material, such as the occurrence of work hardening, which requires appropriate heat treatment in subsequent processes to eliminate.

2. Extrusion：By placing the metal blank in the mold and applying pressure using a press, the blank flows in the mold cavity and finally forms a special-shaped tube. Extrusion molding can produce high-precision, high-quality special-shaped tubes, especially for some special-shaped tubes with complex shapes and high dimensional accuracy requirements. However, the equipment cost of extrusion molding is high and the production speed is relatively slow.

3. Welding combination：For some special-shaped tubes with particularly complex shapes or large sizes, welding combination can be used. First, multiple simple-shaped tubes or plates are cut into suitable shapes, and then they are combined into special-shaped tubes by welding. This method is highly flexible and can be customized according to specific design requirements, but the welding quality has a greater impact on the overall performance of the special-shaped tube, and the welding process needs to be strictly controlled.

4. Application Areas

1. Construction。

2. auto industry。

3. Mechanical Manufacturing。

1. Aerospace。。

2. Building interior decoration。

3. Building structural support。

4. Sunshade system and facade decoration

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