Where is seamless and welded steel pipe difference? 1. Appearance, seamless and welded steel pipe inner wall welding difference in muscle, but there is no seamless. 2. Seamless pressure higher 20g thick-walled seamless pipe, welded pipe is generally about 10 MPa, and now have to do seamless pipe processing. 3. seamless steel pipe was rolling a molding. Welded steel pipe welded need 15crmo after rolling thick-walled seamless, generally spiral welded and straight welding. Seamless performance is better, of course, price is also higher. The tube is a hollow steel bar, a large number of channels for transporting fluids, such as oil, natural gas, water, gas, steam, etc. In addition, engaged in bending, torsional strength, lighter weight, so it is widely used in the manufacture of mechanical parts and engineering structures. Also used in producing a variety of conventional weapons, the barrel, shells and so on. Classification of steel pipe: seamless and welded steel pipe points (pipe joints) two categories. Press the cross-sectional shape can be divided into tube and shaped tubes, round steel widely used, but there are some square, rectangular, semi-circular, hexagonal, equilateral triangle, octagonal shaped steel tubing. For withstand fluid pressure hydraulic pipe must withstand the test of capacity and quality, leakage does not occur at a predetermined pressure, wet or expansion of qualified, but also according to some standard or steel demand side, curling trials , flaring test, flattening test. Seamless steel pipe: seamless steel ingot is made of perforated or solid through the capillary tube, and then by the hot-rolled, cold-rolled or cold call is made. Seamless steel pipe wall thickness specifications mm diameter * number indicates. Hot and cold rolled seamless steel pipe points (written) seamless steel categories. Hot-rolled seamless steel pipe sub-normal, low, medium pressure boiler pipe, high pressure boiler pipe, steel pipe, stainless steel pipe, oil cracking pipe, steel and other steel and other geological. Shandong Liaocheng Polygram Pipe Technology Pipe Co., Ltd. to provide you with the main production structure Liaocheng Polygram, fluid used, high pressure boiler, ship, fertilizer production, oil use, seamless steel gas transmission and coils of pipe into two categories, hundreds of varieties. The company's advanced production technology, excellent product quality, wide product group moments, high quality service to win the praise of Chinese and foreign steel industry. The company passed the ISO9001: 2000 international quality management system certification. Entrepreneurship: "innovation, pragmatism, integrity, and efficient"; Enterprise style: "strict, detailed, real fast"; enterprises principles: to strengthen internal management special thick-walled seamless steel tubes, solid foundation, and comprehensively improve the overall quality of workers, so that enterprise management level to a new level. Mission: to serve the market, quality of survival, innovation and progress, science and technology development. Special thick-walled seamless steel pipe | seamless steel pipe manufacturers | seamless steel pipe provided by the Shandong Liaocheng Steel Pipe Manufacturing Co., Polygram. Shandong Liaocheng Polygram Pipe Manufacturing Co. (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 implementing 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 a better future. You can also access (www.lcbljgg.com/supply_details_42532405.html), for more information about the company.