Under normal outdoor atmospheric environment, the service life of Q355NH weathering steel screens is generally 20–30 years or even longer.
The specific life depends on the environment and installation:
1. Inland & clean air environment (parks, residential areas)
Forms stable protective patina well
Almost no deep corrosion
Service life: 30–50 years
2. Urban & mild industrial environment
Moderate acid gas and humidity
Normal uniform corrosion
Service life: 20–30 years
3. Coastal areas (mild salt spray)
With proper drainage and no water retention
Service life: 15–25 years
4. Severe environments that will shorten life
Long-term water immersion or waterlogging
Strong acid/alkali contact
Severe coastal salt spray
Direct contact with cement/soilIn these cases, life may drop to 5–10 years or less.
Key to extending life
Good drainage and ventilation
No long-term damp
Optional transparent protective coating
Avoid contact with corrosive substances
