Seamless Steel Pipe

　　The new disc-type support scaffolding is featured by its versatility, high efficiency, large bearing capacity, safety and reliability, and is widely used in China’s roads, bridges, water conservancy and hydropower projects, and municipal engineering. 　　Engineering, industrial and civil construction engineering. In recent years, there have been many new professional construction contracting companies of disc-type support scaffolding in China, which are mainly based on the integrated management of scaffold supply, disassembly and recycling. 　　1.The new type of disc buckle scaffolding is versatile: according to the construction requirements of the site, it can be composed of single and double rows of scaffolds, support frames, and support columns with different rental frame sizes, shapes, and bearing capacities. 　　And other multi-functional construction equipment. 　　2.The new disc-type scaffolding has high bearing capacity: the vertical pole connection is coaxial, and the nodes...

　　After the seamless steel pipe is heat-treated, it is required to wait for it to cool before proceeding to the next step. The cooling method of seamless steel pipes changes with the changes in their manufacturing materials. For most steels, the natural cooling method can be used. For some seamless steel pipes with special purposes, in order to ensure the organization state, physical the performance and mechanical properties develop in the expected direction, and certain methods and systems must be adopted. 　　1. Fully annealed. It is used to refine the coarse and superheated structure with poor mechanical properties in medium and low carbon steels after casting, forging and welding. The workpiece is heated to a temperature between 30 and 50 ° C above the temperature at which ferrite is completely transformed into austenite, held for a period of time, and then slowly cooled with the furnace. During the cooling process, austenite is regenerated.The transformation can make the structure...

　　 Welded steel pipe , also called welded pipe, is a steel pipe made by welding steel plates or steel strips after being crimped. The production process of welded steel pipe is simple, the production efficiency is high, there are many varieties and specifications, and the equipment cost is small. 　　Since the 1930s, with the rapid development of continuous production of high-quality strip steel and the improvement of welding and inspection technology, the quality of welds has continuously improved, and the variety of welded steel pipes has increased, and has replaced Seam steel pipe. Welded steel pipe is divided into straight seam welded pipe and spiral welded pipe according to the form of weld. 　　The production process of straight seam welded pipe is simple, the production efficiency is high, the cost is low, and the development is fast. The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. Welded pipes with larger diameters can be produce...

　　Precision seamless steel pipe is a kind of high-precision steel pipe after cold drawing or hot rolling. Due to the advantages of non-oxidized precision seamless steel pipe on the inner and outer walls of the precision seamless steel pipe, high pressure without leakage, high accuracy, high finish, non-deformation in cold bending, flaring, and no cracks during flattening, it is mainly used to produce pneumatic or hydraulic components Products such as air cylinders or oil cylinders use seamless pipes. The chemical composition of precision seamless steel pipe includes carbon (C), silicon (Si), manganese (Mn), sulfur (S), phosphorus (P), and chromium (Cr). 　　Difference between precision steel pipe and seamless steel pipe 　　1. The main feature of seamless steel pipe is that it has no welding seam and can withstand large pressure. The product can be a very rough cast or cold dial. 　　2. Precision steel tubes are products that have appeared in recent years, mainly due to strict toleranc...

　　Shaped seamless steel pipe is a general term for seamless steel pipes of other cross-sectional shapes other than round pipes. According to the different shapes and sizes of the steel tube section, it can be divided into equal wall thickness shaped seamless steel tubes (code D), unequal wall thickness shaped seamless steel tubes (code BD), and variable diameter shaped seamless steel tubes (code BJ). Shaped seamless steel tubes are widely used in various structural parts, tools and mechanical parts. Compared with round pipes, special-shaped pipes generally have larger moments of inertia and section modulus, and have greater resistance to bending and torsion, which can greatly reduce the weight of the structure and save steel. 　　Shaped pipes are generally distinguished according to their cross-sections. According to materials, they can be divided into seamless steel pipe shaped pipes, aluminum alloy shaped pipes, and plastic shaped pipes. The following mainly introduces the special-s...

　　(1) Domestic tubing is in accordance with SY / T6194-96. The length of the tubing is variable, and the range is 8-13m. But no less than 6m sleeves can be provided, and the number must not exceed20%. 　　(2) The inner and outer surfaces of the casing must be free of folds, hairlines, delaminations, cracks, folds and scars. These defects shall be completely removed, and the removal depth shall not exceed 12.5% of the nominal wall thickness. 　　(3) The outer surface of the coupling must be free from defects such as folds, hairline, delamination, cracks, folds, and scarring. 　　(4) The surface of the tubing and coupling threads should be smooth, without burrs, tears, and other defects sufficient to interrupt the threads and affect strength and tight connection. 　　 http://www.xysteelpipe.com/info/Technical-Requirements-for-Tubing-1588-1.htm