Steel copper composite pipe technology background

2023-08-22 05:10:05

Due to its advantages of oxidation resistance, corrosion resistance, good tensile properties and good heat dissipation, copper tubes are widely used in air conditioner condensers and evaporators, refrigerator condensers and evaporators, air conditioners inside and outside machine connecting pipes, and industrial large-scale pipes. In the condenser and radiator. There are two methods for manufacturing copper tubes: cold drawing and coil welding. The cold drawing process uses a hot-rolled seamless copper tube as a material to obtain a copper pipe of a desired pipe diameter after a plurality of drawing processes. The coil tube welding process uses a copper strip as a starting material, and the tube forming is performed in the tube forming unit to form a copper tube, and then the solid tube is obtained by solid-state high-frequency welding.

However, due to the current shortage of copper materials and high prices, the cost of using copper tubes is high, and the weight of copper tubes is heavier. Therefore, people have been trying to find a pipe that can replace copper pipes. Among them, steel pipes are easy to think of because steel is rich in resources and low in cost, and the proportion of steel is small, and the weight is relatively light compared with copper. However, compared with copper pipes, steel pipes have poor oxidation resistance, corrosion resistance and mechanical properties. The use of pure steel pipes instead of copper pipes cannot meet the requirements in many occasions. The manufacturing method of the steel pipe is similar to the manufacturing method of the copper pipe, and also includes a cold drawing process and a coil pipe welding process. The cold drawing process uses a hot-rolled seamless steel pipe as a material, and after a plurality of drawing processes, a steel pipe having a desired pipe diameter is obtained. The coil tube welding process uses a steel strip as a starting material, and the tube is formed in a tube forming unit to form a steel tube, and then a solid steel tube is obtained by solid state high frequency welding. In the course of transportation, the steel strip is usually rolled into a steel coil for transportation convenience.

In order to make full use of the respective advantages of steel and copper, a steel-copper composite pipe has appeared on the market, and its manufacturing methods mainly include expansion, drawing and extrusion. These methods are all made of surface-treated steel pipe and copper tube phase set, and then expanded, drawn, extruded or combined to use the above three methods through expansion joints, drawing machines or extruders. Reciprocating to produce steel-copper composite pipe. These existing methods have low yields, short tube lengths, and low efficiency. What's more important is that the steel-copper composite pipe made by these existing methods can only achieve the mechanical combination of the steel-copper joint surface, and such joint surface will produce between steel and copper during the subsequent processing and use. The phenomenon of stripping, delamination and wrinkling has seriously affected the application and promotion of steel-copper composite pipes.

Global hardware network