Corrugated hoses made of metal materials have different performance. In addition, if the material is deformed and welded unevenly in the process of manufacturing the corrugated hose, high stresses will be locally generated and the service life of the corrugated hose will be reduced.
In addition, welded metal corrugated hoses need not only high temperature corrosion resistance, but also sufficient rigidity. Therefore, when designing and manufacturing corrugated hoses, regarding the choice of materials, the following points should be considered for the production of corrugated hoses. Let's take a look!
Because the thin wall of the corrugated hose is very thick, it is easy to damage its integrity due to pitting and stress corrosion. Therefore, when designing a metal corrugated hose, the working medium in contact with it, and the materials of the connecting parts and the compatible materials must be considered.
The actual situation of the metal corrugated hose is that the temperature is between -253 to 600℃. At high temperature and low temperature, choose different materials. Because the elastic modulus of the material decreases with the rise of temperature, when working at high temperature, the corrugated hose material must have sufficient thermal stability to ensure rigidity, pressure resistance and fatigue life.
At low temperature, surface defects have a great influence on the brittleness of the material, so the selected material must have good low temperature performance and strictly control of the material quality.
The yield strength of the corrugated hose material limits the compression performance of the metal corrugated hose. At the same time, the fatigue strength and structural stability determine the fatigue life of the corrugated hose. In order to ensure the high life of the corrugated hose, please ensure it works within the elastic range of the corrugated hose.
Generally, the formed corrugated hose is made of materials with good plasticity and welding performance, and the large diameter corrugated hose is rounded with a plate, and the seamless tube is used to manufacture the small diameter corrugated hose, and also the formed corrugated hose is manufactured.
What has been introduced above is the following points should be considered for the production of corrugated hoses. The wall thickness tolerance of the corrugated rubber tube material must be determined according to its actual use. When the use of corrugated hoses does not require high rigidity, the wall thickness tolerance of the material is 10% of its thickness;
When the corrugated hose requires good rigidity, the wall thickness tolerance of the material is 5% of the thickness. At present, the materials for the corrugated rubber tube are mainly stainless steel, tin bronze, constant elastic alloy, high temperature alloy, etc.
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