A copper-steel composite pipe and its preparation method

Abstract

The invention relates to a copper and steel composite pipe and a preparation method thereof. The copper and steel composite pipe is composed of a copper pipe and a steel pipe. The steel pipe and the copper pipe are arranged in a sleeving manner. The copper pipe is provided with an external thread, the steel pipe is provided with an internal thread, wherein the external thread and the internal thread coordinate with each other. Alkali degreasing is carried out on the surface of the copper pipe and the surface of the steel pipe, and then, the copper pipe and the steel pipe are rotated and tightly coordinate with each other through the respective threads to form the composite pipe. One end of the composite pipe is provided with an air inlet end cutting sleeve connector and an air cock, the other end of the composite pipe is provided with an air outlet end cutting sleeve connector and an air release valve. Nitrogen is fed into the composite pipe from the air cock, the air release valve isopened to discharge air, internal pressure is kept in the pipe and is stable, warm keeping through heating is carried out, the composite pipe is cooled to the room temperature, finally, the head and the tail of the composite pipe are cut off, and the middle reserved part is the needed composite pipe. The copper and steel composite pipe and the preparation method thereof have the beneficial effectsthat the combination contact face of dissimilar metal is increased; and the nitrogen is fed into the copper pipe, the copper pipe can be prevented from being oxidized, dual functions of the temperature and the pressure are formed to accelerate diffusion, the diffusion time is shortened, and the combining strength is improved.

Description

technical field [0001] The invention relates to the application of composite materials, in particular to a copper-steel composite pipe and a preparation method thereof. Background technique [0002] Copper-steel composite pipe not only has the high strength and toughness of steel, but also has the excellent corrosion resistance of copper. It is used in the production of water supply, gas supply and oil pipelines and chemical industries. Compared with single-material copper pipes, copper-steel composite pipe materials are not only cheap, but also have better sealing performance and higher strength. At present, the manufacturing methods of copper-steel composite pipe include drawing composite method, casting composite method, spray deposition method, mechanical bonding method, and cold drawing and thermal diffusion method. Among them, the cold drawing and thermal diffusion method is relatively simple, but in the drawing process , the extension of the two metals is different, ...

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Problems solved by technology

At present, the manufacturing methods of copper-steel composite pipe include drawing composite method, casting composite method, spray deposition method, mechanical bonding method, and cold drawing and thermal diffusion method. Among them, the cold drawing and thermal diffusion method is relatively simple, but in the drawing process , the extension of the two metals is different, the bonding contact interface of the two metals is small, and the diffusion bonding layer formed is also small, it is not easy to form a high bonding strength, and during the heating process, stress cannot be applied through the contact surface, only At a higher temperature, changing its diffusion energy barrier requires a longer diffusion time, and it is not easy to improve the bonding strength

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