The Certified GB/T Q550NH Weathering Steel
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Gnee Steel (Tianjin) Co., Ltd. is one of the most professional the certified gb/t q550nh weathering steel manufacturers and suppliers in China. Welcome to wholesale customized the certified gb/t q550nh weathering steel at competitive price from our factory. Good service and quality products are available.
GB/T Q550NH Weathering Steel
Unlike regular steel, GB/T Q550NH Weathering Steel forms a self-protecting rust layer when exposed to rain, wind, and pollution, which slows down further corrosion. This means less maintenance, no painting needed, and a longer lifespan for structures.
Q550NH is stronger than common weathering steels (like Q355NH or Q460NH), making it perfect for heavy-duty applications where both durability and load-bearing capacity matter. Its unique alloy mix (including copper, chromium, and nickel) ensures excellent performance in harsh environments, from coastal areas to industrial zones.
Plus, it has a cool, rustic look-the natural rust patina gives buildings and bridges a distinctive industrial style.
Product Information Sheet
| Property | Value |
|---|---|
| Standard | GB/T 4171 (China) |
| Yield Strength | ≥550 MPa |
| Tensile Strength | 670-830 MPa |
| Elongation | ≥15% |
| Corrosion Resistance | 4-8x better than normal carbon steel |
| Key Alloy Elements | Phosphorus (P), Copper (Cu), Chromium (Cr), Nickel (Ni) |
| Weldability | Good (may need preheating for thick sections) |
| Available Forms | Plates, coils, beams, bars |
Where Is Q550NH Used?
Heavy-Duty Bridges & Highways – Strong enough for long-span bridges, overpasses, and crash barriers.
Industrial Buildings – Factories, warehouses, and power plants exposed to rain, snow, and pollution.
Port & Coastal Structures – Container cranes, piers, and offshore platforms (resists salty air corrosion).
Architecture & Landscaping – Modern building façades, outdoor sculptures, and urban design (for that "rusty but classy" look).
Mining & Heavy Equipment – Excavators, dump trucks, and conveyor frames that face rough weather.
Why Pick Q550NH?
✔ Saves Money – No need for frequent repainting or anti-rust coatings.
✔ Strong & Light – Handles heavy loads without adding extra weight.
✔ Eco-Friendly – No toxic paint or coatings, just natural rust protection.
✔ Aging Gracefully – The rust layer gets more protective over time!
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