Shandong Liaocheng Polygram Pipe Manufacturing Co. provides you with non-standard steel pipe, steel pipe is non-standard relative to the Chinese national standard seamless steel pipe shaped in terms of national standard outside, in the production of seamless steel pipe in accordance with national regulatory requirements in diameter size, thickness classify large diameter seamless and allows a certain degree of error, error referred to the national standard in the standard range. In practical use, often national standard specification has some limitations, which corresponds to the emergence of non-standard seamless steel pipe, steel pipe non-standard specifications to supplement the national standard specifications and the production of seamless steel tubes, not said worse than the national standard seamless steel quality. Non-standard shaped seamless steel pipe is the general term for other cross-sectional shapes other than round tube steel. Shaped pipe by pipe section can be divided into different shapes and sizes and so shaped seamless steel pipe wall thickness (code D), ranging shaped seamless steel pipe wall thickness (codenamed BD), variable diameter seamless steel pipe shaped (codenamed BJ ). Shaped seamless steel widely used in various structural parts, tools and mechanical parts. And the tube compared Pipes generally have a greater moment of inertia and section modulus, flexural torsional greater capacity, can greatly reduce the structural weight, saving steel. Non-standard steel pipe commonly used materials are: 20 #, 45 #, 16Mn (Q345A, B, C, D, E) 27siMn, 20cr, 40cr, in the production of non-standard steel pipe, some with GB seamless steel pipe or bar As the tube production, because of the small sales volume, prices tend to be higher than normal large diameter seamless steel seamless national standard, but there are drawbacks non-standard seamless steel pipe, because there is no fixed standard, some manufacturers use two free Seamless pipe joints or defective as a waste tube, so the price is cheaper. So often non-standard seamless steel price volatility, product quality is uneven. How to make the inner steel seamless steel tube Products: seamless steel ingot is made of perforated or solid through the capillary tube 16mn large diameter seamless pipe, 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. High-pressure boiler pipe: mainly used to manufacture high-pressure and more pressure steam boiler tubes with high-quality carbon steel, alloy steel and heat-resistant stainless steel seamless steel tubes, boiler tubes by the party at a high temperature and high pressure work tubes at high temperature flue gas and water vapor effect of oxidation and corrosion will occur, thus requiring a durable steel with high strength, high oxidation resistance, and good organizational stability, the use of steel are: high quality carbon structural steel steel are 20G, 20MnG, 25MnG; alloy steel steel 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB etc; 1Cr18Ni9,1Cr18Ni11Nb rust resistant steel used high-pressure boiler tube in addition to chemical composition and mechanical properties In addition, to be done by the root hydraulic test large diameter seamless pipe, to be flaring, flattening test. Steel to heat treatment delivery. In addition, finished steel microstructure, grain size, decarburization there are certain requirements. Oil cracking pipe: for oil refinery furnace tubes, heat exchanger tubes and seamless pipes. Common quality carbon steel (10, 20), steel (12CrMo, 15CrMo), heat-resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (1Cr18Ni9,1Cr18Ni9Ti) manufacturing. In addition to the chemical composition of the steel pipe is proved and a variety of mechanical properties, but also to ensure the water pressure, flattening, flaring and other tests, and the surface quality and non-destructive testing. In the heat pipe delivery status. Large diameter seamless | large diameter seamless pipe manufacturers | large diameter seamless 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_41908480.html), for more information about the company.