Differences in materials of expansion joints

Expansion joints are divided into cast iron expansion joints, hot-dip galvanized expansion joints and steel expansion joints according to the difference of materials, among which cast iron expansion joints and steel expansion joints are used more. The process of making cast iron expansion joint is to choose gray cast iron as the raw material to carry out the melting into mao pei at the same time, through the production and processing of CNC lathe, in accordance with the size of the construction site to carry out production and processing, steel expansion joint production and manufacturing method is to choose carbon steel welding first, and then send the original factory production and processing.
Steel expansion joint in the engineering construction site must be according to the local temperature difference, soil thickness difference and other factors for engineering construction, generally choose sawing machine sawing, and should be according to the local temperature difference, soil thickness and other factors for coagulation processing, in order to make it have good compressive performance. If the sawing solution is not carried out, it will cause the concrete mix to crack due to the thermal expansion and contraction of the road surface. As the coefficient of thermal expansion, ductility, ductility and compressive strength of gray cast iron are lower than carbon steel, but the tensile strength and carbon steel are both high and the price is much lower than carbon steel. Therefore, cast iron expansion joints can be used where the compressive strength, ductility and ductility of expansion joints are not high.
Because the thermal conductivity of pig iron is relatively large, thus cast iron expansion joints should not be used to carry out applications in regions where the temperature is low, while steel expansion joints have a small expansion ratio and can be applied in all basic natural environments; and cast iron expansion joints are forged from gray cast iron, thus the size of each body part of the expansion joint is determined, and in the application of the road must be selected according to the length of the pipeline to the expansion joint The total number of expansion joints must be selected according to the length of the pipeline. The steel expansion joint is more convenient to use.