16mn seamless change of manganese is 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, texture similar to this is Q345C, Q345D, Liaocheng 16mn seamless, Q345E, quality rating symbols ABCDE respectively are not required impact test impact test temperature of +20 degrees 0 -20 degrees 40 degrees Category: ABCD represents quality level by quality level is divided into A, B, C, D four, 16mn seamless steel pipe, from A to D denote quality from low to high. Different quality level requirements are as follows: A-- offer S, P, C, Mn, Si chemical composition and fu, fy, δ5 (δ10), 1800 can be supplied with cold bend test according to the buyer, but no impact energy provision, carbon content and manganese content is not as terms of delivery. B-- offer S, P, C, Mn, Si chemical composition and fu, fy, δ5 (δ10), cold-formed 180 'test. Also provides + 200C impact energy when Ak≥27J, 16 manganese seamless, C-- except with the B-level requirements, as, also provides impact energy when 00C Ak≥27J. When D ---- except with the Class B requirements, like, but also provide -200C impact energy Ak≥27J E-- except with the Class B requirements, like outside, q345b seamless steel tubes, also provides impact energy when -400C Ak≥27J. 5. presoldered: make straight seam welded steel pipe seam after forming and using gas welding (MAG) welding continuously; 6. internal welding: The tandem multi-wire submerged arc welding (up to four wire) Straight stitch the inside of the pipe welding; 7. Welded: The tandem multi-wire submerged arc welding on the outside of LSAW pipe welding; The ultrasonic inspection Ⅰ: for straight seam welded steel pipe inside and outside on both sides of the base metal and weld seam 100% inspection; 9.X-ray examination Ⅰ: internal and external weld 100% inspection X-ray television industry, the use of image processing system to ensure detection sensitivity; 10. Expanding: for submerged arc welding straight seam steel pipe expanding the entire length of pipe in order to improve dimensional accuracy and to improve the distribution of internal stress of the steel pipe; 11. Pressure test: the hydrostatic test machine for pipe after expanding by-root test to ensure that the steel pipe meet the required standards test pressure, the machine has an automatic recording and storage capabilities; 16mn seamless steel pipe manufacturers, 16mn seamless pipe industry by virtue virtue Liaocheng Industry Co., Ltd. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead virtue of Industry and you work into the brilliant, for a better future!