Production and manufacturing methods boiler tube |; ① general boiler pipe using temperature below 450 ℃, homemade pipe is mainly used on the 10th, the 20th carbon steel hot-rolled or cold drawn pipe tube manufacturing. ② high-pressure boiler pipe often in high temperature and high pressure conditions used in the role of high temperature gas pipe and water vapor, oxidation and corrosion will occur. Requires lasting strength steel with high precision seamless q345b, high resistance to oxidation resistance, and good organizational stability. Uses: ① general boiler tube is mainly used to manufacture water wall tube, boiling water pipe, superheated steam pipes, superheated steam locomotive boiler tubes 45 # precision seamless, large and small pipe and brick arch pipe. ② high-pressure boiler pipe is mainly used to manufacture high-pressure and ultra-high pressure boiler superheater tubes, reheater tubes, airway, the main steam pipe. 16 = 16Mn manganese steel seamless steel pipe is one of the properties of the material 16MN steel 16Mn (Q345B) low-alloy steel is a high-strength structural steel precision seamless steel tubes, carbon content of 0.1% -0.25%, to join the main alloying elements manganese , silicon, vanadium, niobium and titanium; its total alloy containing <3%. 300,350,400 divided by the intensity and 450MPa and other four levels. There are Q295, Q345, Q390, Q420, Q460. : "Q" is the yield of the "Qu" pinyin word uppercase first, followed by figures for grades minimum yield point (σs) value 42crmo precision seamless steel tubes, followed by the symbol is in accordance with the steel impurity elements (sulfur, P) content were accompanied by changes in carbon, manganese and divided into A, B, C, D four and so on. Where A, B grade steel usually called 16Mn. Chemical Composition C: 0.12 ~ 0.20; Mn: 1.20 ~ 1.60; Si: 0.20 ~ 0.55; tensile strength: 470 to 660 N / mm2; yield strength: 275 to 345 N / mm2; elongation: 21%. Specific values ??according to the thickness or diameter of the steel, the above data correspond steel thickness or diameter: 16 ~ 100mm special purpose steel for the bridge as "16Mnq", a special steel for automobile frames "16MnL", pressure vessels special steel for "16MnR". 20 # precision seamless tube industry _ virtues (certified) _ precision seamless steel pipe industry by virtue of Liaocheng Limited. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) Shandong Liaocheng, steel leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Industry leaders in the United States and Germany with the staff warmly welcome all inquiries negotiations to create the virtues pipe industry a better future.