Hebei Chiho Pipe flanges describes the technical requirements Chiho Pipe Co., Ltd. Hebei produced welded flange using certain technical parameters and requirements for production and use in the production and production, to ensure a certain way and in accordance with the principle use and promotion of the use of certain methods and principles of the process of production and welding, and strictly ensure the use of good quality. First, the level of technical requirements and welded flange shall comply with the requirements of JB4726-4728 of. 1, 0.25MP-1.0MPa, PN is carbon steel, austenitic stainless steel forgings allow the use of Ⅰ grade forgings. 2, except as follows, nominal pressure PN is 1.6MPa-6.3MPa forgings shall comply Ⅱ Ⅱ grade or above grade level requirements forgings. 3, in line with one of the following circumstances, should comply with Ⅲ and forgings requirements: (1) Nominal PN≥10.0MPa flange forgings; (2) Nominal pressure PN> 4.0MPa chromium molybdenum steel forgings; and (3) Nominal pressure PN> 1.6MPa and temperature ≤-20 degrees Celsius ferritic steel forgings. Second, the general use of forged or welded flange forging rolling process made. When using steel or steel manufacture carbon steel flanges, must meet the following requirements: 1, welded flange should ultrasonic flaw detection, no delamination defects; 2, should be cut into strips of steel carbon steel flanges along the rolling direction, After bending butt into the ring, and to form a cylindrical surface of a steel ring. May not be directly machined into a steel plate with a neck flange; 3, the ring should butt weld with full penetration welds; 4, ring butt weld after weld heat treatment should be carried out, and for 100% ray or ultrasonic testing and radiographic inspection in line with the requirements JB4730 II level, the ultrasonic flaw detection in line with JB4730 Class I requirements. Third, welded flange neck outer slope shall not exceed 7o. Butt welding flange in the production and strictly control the technical parameters, to ensure that production and use can fully play its role and value. Chiho role Hebei Industry Marine flange introduction: with integral flanges, loose flanges and threaded flange. There are rare integral flange welded flange and welded flange. Less rigid welded flange, and a detachable connection. According to the connected components can be divided into the container flange and pipe flange. By structure type. For pressure p≤4MPa sites; Marine flange welded flange, also known as high-neck, more rigid steel flange price, suitable for high pressure and temperature of the place. Marine flange connection flanges are interconnected so that tube and pipe parts. Connected to the pipe end. Flange has perforations, Marine flange for a flange on the vessel. Can be worn bolts, so that the two flanges tightly connected. Between flange sealing gasket. First each mounted on a flange, flange connection is the two pipes, fittings or equipment. Between two flanges, plus flange gasket flange forging steel, bolted together to complete the connection. Some fittings and equipment has been carrying flange, also belong to the flange connection. Carbon steel flanges | Hebei Chiho | carbon steel flanges forged by Chiho Hebei Industry Co., Ltd. Hebei Chiho Pipe Co., Ltd. (www.hbqh628.com) (www.hbqh628.com) Hebei Cangzhou, forging leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. Hebei Chiho leadership with the staff warmly welcome all inquiries negotiations to create the Hebei Chiho better future.