Internal thread seamless steel pipe (referred to internally threaded tube) refers to an inner wall of the spiral groove processed into seamless steel tubes. Currently own design in our country or abroad 300MW, 600MW and above capacity subcritical and supercritical thermal power boiler, membrane water wall tubes commonly used internal thread. Compared with ordinary light, the thread tube can effectively prevent the vapor film is formed between the water and the pipe wall, increasing the optical tube flow disturbance, so that the wall temperature is more uniform, both to avoid light pipe burn, and improve the boiler The heat transfer efficiency. Number of thread according to the needs of the female has four, six, eight dollars, the main materials are 20G, SA210C, T2, T12,12Cr1MoVG, 15CrMoG, T22, T23 and so on, China's annual required rifled tube 2.5 ~ 30,000 tons. In order to meet the needs of large-capacity subcritical and supercritical (ultra) supercritical boiler development, Tianjin Pipe Group Co., Ltd. (Tianjin steel pipe) Φ150mm casting tube, there is a three-roll Pipe Mill Φ168mmPQF provide Φ76mmx9mm shortage, the thread steel, die by self-designed and successfully developed a 15CrMoG material 8 Φ51mmx5.7mm high-pressure boiler tube internal thread. The technical requirements of the female threaded tube high-pressure boiler general technical requirements to be met in addition to the light pipe, but also according to GB / T 20409-2006 "high-pressure boiler seamless steel tubes threaded" standards or purchase each boiler factory specification, steel tube 210C, its size and thread parameter deviations have different requirements. Such as Tianjin Pipe cold rolled stainless steel plant development in 15CrMoG material 8 Φ51mmx5.7mm high-pressure boiler pipe internal thread, technical requirements in Table 1. Why are threaded with inner tube boiler tube with a hollow cross section with a lot of transportation, largely used as pipeline fluids, such as transportation of oil, natural gas, gas, water and some solid materials, pipes and so on. And other high-pressure boiler pipe and solid steel bar, compared to the same torsional strength in bending, lighter, high-pressure boiler pipe is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle frames and construction using steel scaffolding. High-pressure boiler pipe manufacturing ring parts Can improve material utilization, simplify the manufacturing process, saving materials and processing time, such as bearing rings, jack sets, has been widely used to manufacture steel. Internal thread high-pressure boiler tube or barrel ,, indispensable material would have to make steel. High-pressure boiler tubes threaded according to different cross-section shapes can be divided into tube and shaped tubes. Since in perimeter of equal conditions, the largest area of ??a circle, with the circular tube can carry more fluid. In addition, the circular cross section to withstand internal or external radial pressure, the force is uniform, so the vast majority of pipe is pipe. The above information is provided for you by the Shandong Liaocheng Steel Pipe Manufacturing Co. Polygram. Shandong Liaocheng Polygram steel company provides steel pipe inspection need those data: different materials within the steel tube boiler, with different test methods, such as steel (also carbon steel, alloy steel, stainless steel, etc.), sheet metal, steel non-ferrous metal materials, the detection methods and content are different standards in various materials are related to the inspection requirements, 210c in the steel tube, can be tested in accordance with the requirements of the standard, contract, technical protocols, and later configure detection tools, test equipment, etc. also restrict implementation of inspection, it is to examine seamless arrival Case Simply put: 1, check the packaging: for damage, compliance with contracts, technical agreements and standards. 2. Check mark: mark the content is complete, complete, sign is clear and firm. 3, check the technical documents: whether certification, quality certificate and check specifications and lot number is consistent with the physical. 4. Check the appearance of the pipe (1) internal and external surfaces of the steel pipe must not have cracks, folding, rolling off, separation, hairline and scarring defects; (2) pipe ends should be cut at right angles, and clear the glitch; ( 3) The pipe may not have severe bending and deformation phenomena. (4) steel surface may not have serious corrosion phenomenon, the general corrosion should clean repair. 5, check the pipe diameter, wall thickness, length geometry should meet the standards, contract requirements. 6, roundness and wall thickness pipe inspection unevenness shall not exceed 80% of the diameter and wall thickness tolerances. 7, if the conditions can be chemical composition, mechanical properties of detection. 8, if the conditions, according to the contract, technical information, can be detected microstructure. Within 210C steel pipe, steel pipe SA-210, within the steel pipe provided by the Shandong Liaocheng Steel Pipe Manufacturing Co. Polygram. Liaocheng in Shandong Steel Pipe Manufacturing Co. Polygram (www.lcbljgg.com) (www.lcbljgg.com) (www.sdlcblj.com) (www.bljggzz.com) Shandong Liaocheng, wire, pipe, plate manufacturing equipment leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Polygram steel leader with the staff warmly welcome all inquiries negotiations to create Polygram steel better future.