通风管道是建筑通风的重要设施，它在通风和保证室内空气流通方面发挥着重要作用。一般来说，它是由金属材料制成的。然而，有些通风管道需要输送高温空气。
济南通风管道制造企业总结了以下几点:
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:
蠕变:钢在高温外力作用下，随着时间的延长，会缓慢而连续地产生塑性变形，称为蠕变。钢的蠕变特性与温度和应力密切相关。当温度或应力增加时，蠕变速度加快。因此，锅炉、蒸汽管道、压力容器等长期高温运行的钢材应具有良好的蠕变抗力，以防止蠕变引起的大量变形，导致结构断裂和爆炸等恶性事故。
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.
球状化处理和石墨化:在高温的作用下,碳钢的渗碳体将迁移和聚集能量,形成的渗碳体在铁氧体粗粒和混合,球从片状渗碳体将逐渐改变,称为球状化处理。由于石墨的强度很低，而且出现在片状，使材料的强度大大降低，脆性增加，称为材料的石墨化。
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.
热疲劳性能。钢结构长期处于冷热交替状态，在温差变化引起的热应力作用下，材料内部会产生细小的裂纹，导致断裂。因此，在温度波动的工况下，钢的结构和管道应考虑热疲劳性能。
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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