How to identify people often think steel pipe steel pipe magnets, and verify the authenticity of their advantages and disadvantages, do not attract non-magnetic, considered a good, genuine; sucked by magnetic, it is considered counterfeit fakes. In fact, this is an extremely one-sided, no practical method to identify errors. Many types of steel pipe, according to the organizational structure at room temperature can be divided into several categories: commonly used as a decorative tube plate steel pipe most of austenitic 304, in general, is a non-magnetic or weakly magnetic, but the smelting fluctuations caused by the chemical composition or the processing status of different magnetic may also occur, but it can not be considered to be counterfeit or substandard, which is what causes it? In addition, 304 steel pipes after cold working, organizational structure will be transformed to martensite, the greater the degree of cold deformation, martensite transformation, the more magnetic thick-walled steel pipe, steel is also greater. As the strip batch number, production Φ76 pipe, no magnetic induction, production Φ9.5 tube. Ling bending deformation of large magnetic induction obviously some rectangular tube production due to the large amount of deformation pipe, steel pipe, especially Angular part, more intense magnetic distortion is more evident. This tells us that if the steel pipe with a weak magnetic or entirely without magnetic, should determine the 304 or 316; if the magnetic steel of the same, showing ferromagnetic, it is determined not 304. Now thread in the boiler tubes are not divided into non-thread sealing and thread sealing, now divided into three standards: column / column with the column / cone fit and cone / cone fit. Pillar / column with: no sealing capability, can add sealing structure for low static load. Column / Cone with: a sealing capability, used in the low-pressure static load, such as water, gas pipes. Cone / Cone with: more difficult to complete a full cone seal, they often have screwed tight, but still there is a leak. But once a seal will not easily be destroyed, for high-pressure dynamic loading. 55 degrees sealing pipe thread - internal Taper internal and external threads sealed low probability, but can not easily be destroyed, can be used in high pressure, to withstand impact loads of occasions. GB / T 7306.2-200055 of the non-sealing pipe thread - the thread of the cylindrical inner cylindrical outer thread after its internal and external thread with not having a seal, only play the role of mechanical connections in the piping system, can make use of the seal in the thread deputy outside the sealed end faces, used under static load low-pressure piping systems. Liaocheng in Shandong Steel Pipe Manufacturing Co. Polygram provide you with Polygram Liaocheng Steel Pipe Co., Ltd. specializes in the supply of seamless pipe thread, the current manufacturers have cooperation, Kazakhstan pot, Wu Guo, North pan, pressure pipe, the pot We mainly supply standards (standard rate and GB) Spot large, mainly Baosteel, Chengdu production, thick-walled steel pipe, steel production and value for France, Germany, Japan and other plants in the production of high quality seamless steel pipe spiral, The main materials are ASTM, T12.T11.T23, steel research 102,210C, 210A1,106C, 106B Main specifications; 6.55,44.5 * 6.45,50.8 * 38.1 * 5.6 50.8 * 60.3 * 8.0 5.6,60.3 * 7.1 63.5 * 6.6 66.7 * 7.5, etc., each length of pipe are more than 10 meters, can be customized according to customer special size large attached the original warranty requirements, we have been committed to each products are authentic, our company to quality service welcome your inquiries. Steel, 20 # steel, small diameter 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.