Thanks to its excellent atmospheric corrosion resistance, medium yield strength, good weldability and low maintenance cost, Q345NH is widely used for exposed outdoor steel structures that require long service life and less painting work.
1. Bridge and traffic infrastructureIt is commonly used for main girders, cross beams, pier caps, support frames, guardrails and pedestrian landscape bridges. Its natural anti-rust ability greatly reduces later painting maintenance and prolongs structural life in urban, rural and mild industrial atmospheres.
2. Railway and transportation equipmentApplied to railway freight car underframes, wagon side plates, container structural frames, heavy truck chassis and logistics vehicle load-bearing parts. It resists outdoor rain, dew and dust corrosion, adapting well to long-distance transport exposure.
3. Power and communication steel towersUsed for transmission line towers, communication signal pylons, wind power auxiliary brackets and outdoor light pole structures. The stable rust layer lowers corrosion speed under open-air conditions and cuts annual upkeep expenses.
4. Industrial and outdoor building steel structuresSuitable for outdoor factory steel frames, large-span trusses, external pipe racks, workshop canopy structures and open-air warehouse supports. It avoids frequent anti-corrosion coating renewal in dry-wet cyclic environments.
5. Architectural landscape and decorative engineeringPopular for rust-style building curtain walls, outdoor art sculptures, landscape retaining walls, garden structural frames and large weathering steel flower pots, combining anti-corrosion performance with natural aesthetic patina.
6. Machinery and port auxiliary structures (limited use)Can be adopted for outdoor crane frames, conveyor trestles and material racking in inland ports or areas far from salt spray; not allowed in seawater splash, tidal or immersion zones without coating protection.
