Steel pipes are not only used for conveying fluids and powdered solids, exchanging heat, manufacturing mechanical parts and containers, but also as an economical steel material. Using steel pipe wholesale to make the structural framework, pillars, and machinery supports in buildings can reduce weight, save 20-40% metal, and achieve factory mechanical construction.
Currently, steel and pipe structures used in engineering can be classified according to the shape of the cross-section, the structural form, and the manufacturing method. Based on the shape of the cross-section, steel and pipe structures can be divided into three categories: round tube structures (CHS), rectangular tube structures (RHS), and other shapes. Due to the superior appearance and mechanical properties, round and rectangular tube structures are the most common. In terms of structural form, pipe structures can be categorized into four types: lattice (shell), truss, frame, and steel pipe concrete structure. In general, a tubular structure refers to a structure that uses round and rectangular tubes as components and is connected by intersecting welding. According to the production method, seamless steel pipe for sale can be divided into hot-rolled seamless steel pipe structures, cold-rolled seamless steel pipe structures, and welded steel pipe structures. Hot-rolled seamless steel pipe has thick walls and high production costs, while cold-rolled seamless steel pipe has relatively thin walls.
The structural characteristics of round steel pipe and steel rectangular pipe can be summarized as follows:
The cross-section of round and rectangular steel pipe has the characteristic of double-axis symmetry, and the centroid of the cross-section coincides with the shear center. The moments of inertia of the cross-sections of round and square tubes are the same, making them ideal for bending and compression members.
The cross-sections are closed, with good torsional rigidity and local plate stability, especially for round pipes, which are particularly effective in resisting torsion.
The appearance is simple and smooth, and the members can be directly welded together without the need for joint plates, saving steel.
Compared with open cross-sections, the cross-sections of round steel pipe and rectangular steel pipe have smooth surfaces, no dead angles, and a small outer surface area, which is advantageous for saving anti-corrosion and fireproof coatings and makes dust removal easier.
The wind resistance coefficient of the steel pipe cross-section is small and has a significant advantage when contacting fluids such as wind and water flow.
The internal space of the steel pipe structure can be utilized. Filling the steel pipe with concrete (steel pipe concrete structure) can not only improve the load-bearing capacity of the members but also extend the fire resistance limit of the members (average of up to 2 hours). For example, rainwater pipes; prestressed cables can also be placed in the pipeline to apply prestressing inside the body.
The material unit price of steel pipe structures is higher than that of ordinary open-section steel.