The following are the key precautions for using stainless steel finned tubes, including comprehensive selection, installation, operation, and maintenance requirements throughout the entire process:
1. Material and environmental compatibility
Chloride ion environment (such as coastal and chemical industries): 316/316L stainless steel containing molybdenum (with a molybdenum content of 2% -3%) should be selected, which has a pitting corrosion resistance that is more than three times higher than 304; When the chloride ion concentration is greater than 50ppm, 304 is prohibited.
High temperature>800 ℃: choose 310S (Cr25Ni20), long-term temperature resistance 1080 ℃; Avoid operating 316L at temperatures exceeding 900 ℃ (accelerated thickening of the oxide layer).
Low temperature condition (-196 ℃): 304/316 can meet the requirements, but the flow rate of the medium needs to be controlled to prevent frost heave and rupture.
2. Process structure selection
High frequency welding fins: The fusion rate of welding points should be ≥ 90%, and the tensile strength should be 450-550MPa;
Whole rolled fins: no weld structure, suitable for strong vibration or high-temperature thermal cycling scenarios.