Introduction 1. Needed material must have a very good plasticity, it is a good elastic properties and processing steel bellows, and with the subsequent processing to achieve higher flexibility and strength needed. 2 material must have a tensile strength and fatigue strength, which can ensure the normal functioning of elastic function. 3 have a strong soldering ability, and also to meet the requirements needed for welding. 4 is an elastic material having a main reason, because of the time and temperature of steel bellows often affected by the time. Materials needed 5 must have sufficient corrosion resistance, ensuring the life and safety of steel bellows in engineering among. The main features of the bellows by means foldable along fold wrinkles sheet stretching direction of the tubular elastic member connected to the sensitive. It is fixed to the open end, the end seal in a free state, and the auxiliary coil spring or springs to increase flexibility. When working under the effect of the internal pressure of the elongation along the longitudinal direction of the tube, the movable end of a displacement of the pressure generated in a certain relationship. Events end led to a direct indication of the size of the pointer pressure. Often in combination with bellows together forming the output of the displacement sensor is a pressure sensor power is sometimes used as a spacer element. Since the corrugated tube requires a larger volume change stretch, so it is lower than the response speed of the Bourdon tube. Bellows suitable for measuring low pressure. Other notes corrugated pipe culvert will 2.0-7.0mm thin steel plate is pressed into a corrugated surface, the pipe sections or plates made, you can increase the level of resistance to its stiffness and pressure tube axis, corrugated culvert pipe is a flexible structure, with certain seismic capacity, and can accommodate a larger settlement and deformation. After it was built with the surrounding soil to form a composite structure, joint force. Corrugated pipe culvert has been widely used in highways, railways and more large-scale engineering and project over the years, as the mainstay of China's construction played a role. Corrugated pipe culvert with its superior performance received a lot of praise of the project, but also by a lot of customer recognition. Transactions that cheap! Free installation!