Abstract
Erosion widely exists in oil and gas production and transmission pipelines, which seriously affects the service life of pipelines. Ordinary carbon steel pipe can meet the strength and pressure of oil and gas transportation, but it has the disadvantages of poor erosion resistance, short service life and frequent replacement. The cost of using erosion resistant metal pipe is high, which is not suitable for comprehensive popularization and application. Bimetallic composite pipe includes outer layer and inner layer. It is formed by two different metals through a variety of processing technologies, which has the advantage that a single material does not have. It not only has the strength and toughness of the outer pipe, but also has the erosion resistance of the inner pipe. The service life of bimetallic composite pipeline can be 4–6 times longer than that of traditional carbon steel pipeline, and the manufacturing cost is relatively low, the service time is long, and it has good economy. Therefore, it is more and more widely used in oil and gas production and transportation. However, the common problem of bimetallic composite pipe is that the bonding interface between outer pipe and inner layer is not fully bonded and there has gaps. Or the interface binding force is not enough. When the composite pipe is eroded by the fluid in the pipe, the stress concentration at the interface will lead to the separation of the inner layer and the outer pipe, leading to the reduction of the service life of the pipe. Therefore, how to prepare the bimetallic composite pipe with good quality and strong erosion resistance has become an urgent problem to be solved. In this paper, carbon steel cemented carbide bimetallic composite pipe was prepared by electromagnetic heating through the application of centrifugal force and molten metal fluidity. The joint surface of the prepared bimetallic composite pipe was observed and analyzed, and the erosion test of the inner layer was carried out. The micro morphology of the erosion sample was observed and analyzed by shape analysis laser microscope. The erosion rate was accurately calculated according to the mass loss of the sample before and after erosion. The results show that the bimetallic composite pipe prepared by the above method has good interface bonding quality and no obvious defects. In the same erosion environment, the bimetallic composite pipe has stronger erosion resistance, lower erosion rate and higher service life than carbon steel pipe. Therefore, through the exploration of the preparation method of bimetallic composite pipe, this paper improves the preparation process of bimetallic composite pipe, improves the comprehensive mechanical properties and erosion resistance of bimetallic composite pipe, and promotes the application of bimetallic composite pipe in industrial production.
