The chemical properties of copper are stable, and it combines the characteristics of cold resistance, heat resistance, pressure resistance, corrosion resistance and fire resistance (the melting point of copper is as high as 1083 degrees Celsius), and can be used for a long time in different environments. The service life of copper pipes can be as long as the service life of buildings, or even longer. For example, the copper plumbing fittings installed in Peking Union Medical College Hospital in the 1920s have gone through more than 70 years and still perform well. It can be seen that the copper pipe is a pipe that has been fully tested by more than a hundred years of time and practical experience.
Copper pipes combine the advantages of metal pipes and non-metal pipes. It is harder than plastic pipes and has the high strength of general metals (the strength of cold drawn copper pipes is equivalent to that of steel pipes with the same wall thickness); it is also more flexible than general metals, has good toughness and high ductility, and has excellent vibration resistance and resistance. Impact and frost heave resistance.
The copper tube can withstand extremely cold and extremely hot temperatures, with a wide application range from -196 degrees to 250 degrees, and adapts to drastic changes in temperature (—high temperature—low temperature—high temperature—), and its performance will not change due to long-term use and temperature And if it is reduced, aging will not occur. This is beyond the reach of ordinary pipes.
The linear expansion coefficient of copper pipe is very small, which is 1/10 of that of plastic pipe, which can resist fatigue. When the temperature changes, it will not produce excessive thermal expansion and contraction, which will lead to stress fatigue cracking.
These characteristics make the application of copper pipes in cold regions extremely advantageous. In severe cold areas, the temperature difference between morning and evening is large, the linear expansion coefficient of ordinary pipes is large and the strength is low, and it is easy to produce stress fatigue cracking caused by thermal expansion and contraction. Some claim that -20°C is not brittle, but they can’t withstand working pressure, and have a short service life, which is of no practical significance. Although heat preservation measures can be used, it is inevitable to encounter low temperatures during transportation, storage and installation. The performance of the tube is the same at -183 degrees and normal temperature.
