The head is a part of the container, depending on the geometry can be divided into several spherical, oval dish, of spherical, conical shell peace cover, etc., in which spherical 
 Oval dish, spherical cap head collectively referred to as the convex head. Used in a variety of container equipment, GB150 and the thickness of the definition of the head standard is not reasonable, thickness requirements after the forming of the container and head, convex head and hot roll forming thickness requirements shall not be less than The nominal thickness less steel plate negative deviation δn-C1, which may lead to the design and manufacture of increase in thickness to ensure the forming of the thickness of two on the basis of the design thickness. For this reason, once proposed the concept of forming the smallest thickness: the need to ensure that the thickness of hot rolled cylindrical or convex head forming, and its value is not less than the design thickness. Means that designers should be marked on the drawings the nominal thickness and forming the smallest thickness (design thickness δd), which makes the manufacturing units to round the amount of the manufacturing process and the design of the original design plus manufacturing thinning. 

 Changzhou Huayi Pipe Industry Co., Ltd., located in China Elbow 
 Pipe "- Hebei Cangzhou. East of Bohai Bay of Huanghua Port, north of Beijing and Tianjin, the superior environment and convenient transportation, is emerging a pipe equipment for comprehensive enterprise's goal is to focus on domestic and foreign petrochemical , electricity 
 Power, chemical industry, metallurgy field, process piping and equipment design, research and development. Has CSPC (BSF), Nanjing Young Pakistani, Beijing Electric Power Construction, Sinopec Corporation, five companies, 10 companies, thirteen of the built supporting capacity 
 Products. The company has 3 senior engineers, and the domestic part of the Design Institute jointly develop new products, training mid-level technical management staff of 30 people. Supporting the production line 9. Can be forged, the push system, simmer, pressing, welding, heat treatment. With chemical analysis, physical testing, radiographic testing, ultrasonic testing, magnetic particle coloring, advanced detection means, provide an effective guarantee for product quality. The quality policy of the company adhere to the "scientific management, genuine high quality, the pursuit of perfection, serve the people, contributing to society" and "customer supreme, reputation is golden and warm service, respond quickly," business philosophy, perfect network marketing system. 

 Contact: Mr. Chen 
 Phone: 18631726935 
 0317-8511658 Fax :0317 -6216159