Yanshan County Bo Yan Pipe Co., Ltd. is located in Yanshan County Industrial Development Zone. North of Beijing and Tianjin and Beijing-Shanghai railway to the east Bohai Sea, Tianjin Port, State Road across the county superior geographical conditions, the size of the head, the rich local resources, for my company's development has laid a good foundation. Best-selling products, and exported to South Korea, Vietnam, Singapore, Malaysia and other countries. I used to pursue "science and technology first, gaining the upper hand, quality, customer supreme, credit first" business ideas, is willing to domestic and foreign users and sincere welcome customers to work together to create a better future. The size of the head (diameter pipe) is applied to a pipe diameter of pipe. Forming process commonly used to suppress necking, expanding suppress or necking plus expanding suppress certain specifications diameter pipe may also be stamping. a. necking / expanding the size of the head of reduced diameter forming forming process is the size of the head with a diameter equal to the big end of the tube into the forming die, by pressing the tube along the axial direction of the metal along the cavity movement and shrinkage forming. Depending on the size reducer adjustable, divided into one or more press-forming press forming. b. stamping steel as raw materials except the size of the head, the right part of the specification of the size of the head but also with the use of steel stamping process for production. Stretching die shape used in the size of the first reference surface size design, with steel stamping die cutting after the stretch forming. Yanshan County Bo Yan Pipe Co., Ltd. mainly produces steel seamless pipe fittings, steel pipe joints, forged fittings, flanges and other forged products pressure piping components, power accessories, concrete pump pipe fittings and other products, please call us diameter welded steel pipe is hot pressing or forging molding size of the head, it is connected directly to the size of the head form is welded steel pipe. Butt-diameter pipe generally concentric and eccentric head size head, materials are carbon steel, alloy steel and stainless steel. Diameter welded steel pipe is hot pressing or forging molding size of the head, it is connected directly to the size of the head form is welded steel pipe. Butt-diameter pipe generally concentric and eccentric head size head, materials are carbon steel, alloy steel and stainless steel. The main butt diameter pipe manufacturing standards are generally GB / T12459, GB / T13401, ASME B16.9, SH3408, SH3409, HG / T21635, HG / T21631, SY / T05010, Ministry of standard GD0506 ~ 0507 Pressure Vessel supporting flanges, tube sheet corresponding standards: JB / T4700 ~ 4707-2000 implementation of national standards (GB / T9112-2000), Cangzhou head size, machinery of the standard (JB / T81-1959, Tangshan size of the head, JB / T74-1994) , Inner Mongolia, head size, OGC standards (SH3406-1996), marine standards GB / T10752-1999, Ministry of Chemical Industry Standard (HG / T5010-1958, HG / T20592-2009) and so on. Forged flange material exports meet US ASTM A105 standards. Size of the first rock pipe industry _ _ Bo Tangshan size of the head by Bo Yan Pipe Co., Ltd. Yanshan County. Yanshan County Bo Yan Pipe Co., Ltd. (www.czbygy.com) quality of service and products, continue to receive the recognition and trust of new and old customers and the industry. Our company is a certified member of the whole alliance network operators, business alliance customer service icon on the page, you can talk directly with our customer service staff, to our future cooperation happy!