Cangzhou Bohai Pipe Co., Ltd. specializing in the production of alloy steel elbow formula [(OD - Wall Thickness) * Thickness] * 0.02466 = kg / m (weight per meter) alloy pipe dimensions and tolerances P22 alloy tube process overview Thermal rolled (extruded seamless pipe): round tube → heating → perforation → three-roll rolling, rolling or extrusion → → set off pipe diameter (or reducing) → cooling → billet tube → straightening → hydrostatic test (or testing) → mark → storage. Alloy steel elbow. Cold drawn (rolled) seamless steel pipe: round tube → heating → perforation → Heading → annealing → pickling → oiled (copper) → multi-pass cold drawn (cold) → billet tube → heat treatment → straightening → hydrostatic testing (testing) → mark → storage. Cangzhou Bohai Pipe Co., Ltd. specializing in the production of alloy steel elbow a. Process Overview p22 cold drawn (rolled) seamless steel pipe: round tube → heating → perforation → Heading → annealing → pickling → oiled (copper) → multi-pass cold drawn (cold) → billet tube → heat treatment → straightening → hydrostatic test (testing) → mark → storage. 15CrMo alloy steel elbow, Cangzhou Bohai (certified), alloy steel elbow Ltd provided by Cangzhou Bohai tube. Cangzhou Bohai Tube Co., Ltd. (www.czbh628.com) (www.hbbh628.com) is an industry leader in Cangzhou, Hebei, three, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customers needs. Cangzhou Bohai leadership with the staff warmly welcome all inquiries negotiations to create a better future Cangzhou Bohai.