GB5310-2008 (high-pressure boiler seamless steel tubes). Mainly used for power plants and nuclear power plant boilers, high temperature, high pressure fluid delivery header and pipes. Representative material for 20G, 12Cr1MoVG, 15CrMoG so on. GB5312-1999 (ship Seamless Carbon and carbon-manganese). Mainly used for ship boilers and Superheater I, II grade pressure pipe. Representative material for 360,410,460 steel grade and so on. GB6479-2000 (high pressure chemical fertilizer equipment, seamless steel pipe). Mainly used for conveying high temperature and high pressure fluid pipe fertilizer equipment. Representative material for 20,16Mn, 12CrMo, 12Cr2Mo so on. GB9948-2006 (petroleum cracking seamless steel pipe). Mainly used in oil refinery's boilers, heat exchangers and pipes conveying fluid. The representative material for 20,12CrMo, 1Cr5Mo, 1Cr19Ni11Nb so on. GB18248-2000 (seamless steel gas cylinders). Mainly used for the production of gas, hydraulic cylinders. The representative material for 37Mn, 34Mn2V, 35CrMo and so on. 16mn seamless change manganese divided into A, B, C, D four and so on. Where A, B grade steel usually called 16Mn. 16Mn pipe joints, said the current law: Q345B seamless steel pipe, material similar to this for Q345C q345 small-diameter pipe, Q345D 20 # small diameter pipe, Q345E 45 # small diameter pipe, quality grade, respectively, are not required to sign ABCDE impact test impact test temperature of 0 degrees -20 degrees to +20 degrees to 40 degrees Category: ABCD represents quality level according to the quality level is divided into A, B, C, D four, from A to D, said the quality from low to high. Different quality level requirements are as follows: A-- provide S, P, C, Mn, Si chemical composition and fu, fy, δ5 (δ10), the need to provide 1800 cold bend test according to the buyer, but no impact energy requirements, carbon content and manganese content is not as delivery conditions. B-- provide S, P, C, Mn, Si chemical composition and fu, fy, δ5 (δ10) small-diameter steel pipe, cold 180 'test. Also provides the + 200C impact energy Ak≥27J, C-- same except with the Class B requirements, but also provides impact energy when 00C Ak≥27J. D ---- except with the same class B, but also provides impact energy when -200C Ak≥27J E-- same except with the Class B requirements, but also provides -400C impact energy Ak≥27J. Small-diameter steel pipe, pipe industry virtues, small-diameter steel pipe Co. # 20 by virtue Liaocheng Pipe. "Ductile iron pipe, bearing steel pipe, steel pipe, thick-walled seamless" preferred Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc .com), the company is located: Liaohe Road, Liaocheng Economic Development Zone, over the years, the virtues of the tube industry to provide customers with the best quality service, contact: carcinogenesis. Welcome to the new and old customers call, letter, visit the guide, business negotiations. Virtue Pipe expect to be your long-term partner!