Hengshui City Value Optical Engineering Rubber Co., the predecessor of Taocheng scale light Rubber Products Factory, the company specializes in the production of a bridge with a prestressed corrugated plastic pipe, prestressed corrugated metal pipe, ultrasonic test tube (Acoustic Pipe), embedded bolt corrugated tube, pipe, flat tube, rubber ...... specification is complete quality assurance! The company has passed ISO9001: 2000 international quality system certification, the products are widely used in bridges, roads, concrete works! Prestressed corrugated metal pipe is a flexible, thin-walled, corrugated tube shell lateral parts. It is both elastic properties have sealing characteristics, in the role of external forces and moments can produce axial, angular, lateral, and a good combination of displacement, sealing performance. In machinery, instruments, petroleum, chemical, power, heating, locomotives, ships, nuclear industry, aerospace and many other industries ?? material properties of the metal bellows metal bellows mainly depends on the quality of the material and the bellows bellows geometry after molding. Bellows performance can meet the design requirements, to a large extent depends on the manufacturing quality of these materials. Distortion material, welding uneven, irregular waveform after molding and residual stress injury can cause high local site, resulting in premature destruction of the bellows. Select bellows material should mainly consider the following points:? 1) compatible metal bellows material must be compatible with the work of the media and contact various parts connected, because the thickness is thin, it is easy to spot because of corrosion and stress corrosion damage to the integrity of the bellows. Cleaning media and cleaning processes used must be carefully studied because of the bellows bellows, are more difficult to clean and inspect. ? 2) the temperature of the metal bellows operating temperature range (-253? ~ 600) ℃. Bellows material used to work at high temperatures have sufficient thermal stability. Temperature increases, the elastic modulus of the material decreased, resulting in the stiffness of the bellows, reduce the pressure resistance and fatigue life. Bellows material at low temperatures used, must have good low temperature performance. At low temperatures, brittle materials on the table and the defect is very sensitive, therefore, the surface quality of the material should be strictly controlled. ? 3) bearing capacity metal bellows life and stress by limiting the yield strength of the material, while restricting the number of cycles of fatigue fatigue life of materials and structural stability of the subject. Demanding life bellows should be designed to work in the elastic range, such as instrumentation components and shaft sealing bellows. ? 4) manufacturing techniques of various materials for forming bellows. Require its good ductility and weldability. Smaller diameter seamless bellows usually manufactured, and the diameter of more than 25mm of the bellows, the available sheet or strip after forming a circle Simple longitudinal seam welding, and then forming the bellows. ?