Ventilation pipeline is an important facility for building ventilation. It plays an important role in ventilation and ensuring indoor air circulation. Generally speaking, it is made of metal materials. However, some ventilation pipes need to deliver high temperature air. Jinan Ventilation Pipeline Manufacturing Enterprise summarizes the following points:
Creep: Under the action of high temperature external force, steel will produce plastic deformation slowly and continuously over time, which is called creep. Creep properties of steel are closely related to temperature and stress. The creep rate increases with the increase of temperature or stress. Therefore, steel products such as boilers, steam pipes, pressure vessels and other long-term high-temperature operation should have good creep resistance to prevent a large number of deformation caused by creep, leading to structural fracture and explosion and other malignant accidents.
Spherical treatment and graphitization: Under the action of high temperature, the cementite of carbon steel will migrate and accumulate energy. The cementite formed is mixed with coarse ferrite particles, and the sphere will gradually change from flake cementite, which is called spheroidization treatment. Graphite is called graphitization of materials because of its low strength and flaky appearance, which greatly reduces the strength and increases the brittleness of materials.
Thermal fatigue properties. The steel structure is in the alternating state of heat and cold for a long time. Under the action of thermal stress caused by temperature difference, tiny cracks will occur inside the material, leading to fracture. Therefore, in the case of temperature fluctuation, the thermal fatigue properties of steel structures and pipes should be considered.
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