Q355GNH Corten steel circular pipes are a low-alloy, high-strength steel widely used in architecture, industry, and landscape projects due to their corrosion and weather resistance.
Compared with ordinary carbon steel, Q355GNH forms a stable and dense rust layer in natural environments, reducing the corrosion rate by approximately 5–8 times and achieving an outdoor service life of 40–80 years, significantly lowering long-term maintenance and replacement costs.
The mechanical performance of Q355GNH pipes is also excellent. The yield strength is ≥355 MPa, tensile strength ranges from 470 to 630 MPa, and elongation after fracture is greater than 20%.
In Charpy impact tests at 20°C, it achieves ≥34 J, ensuring that the pipes provide reliable stability and safety in load-bearing structures such as bridge railings, containers, transmission towers, and industrial equipment-even under wind, snow, or heavy loads.
Mechnical property
| Thickness (mm) | ||||
| Q355GNH | ≤ 16 | > 16 ≤ 40 | > 40 ≤ 60 | >60 |
| Yield strength (≥Mpa) | 355 | 345 | - | - |
| Tensile strength (Mpa) | 490-630 | |||
Chemical composition
| Main chemical elements composition of Q355GNH corten plate | |||||||
| C | Si | Mn | P | S | Cu | Ni | Cr |
| 0.12 | 0.20-0.75 | 1.00 | 0.07-0.15 | 0.020 | 0.25-0.55 | 0.25-0.55 | 0.30-1.25 |
In terms of maintenance and environmental benefits, Q355GNH pipes require almost no additional coating, reducing maintenance costs by 30–50% compared to ordinary carbon steel.
The absence of paint also lowers VOC (volatile organic compound) emissions, while the steel itself is 100% recyclable, aligning with green building and sustainability goals.
The size range of Q355GNH circular pipes is highly versatile, with outer diameters from 21.3 mm to 2020 mm, wall thickness from 1.5 mm to 25 mm, and lengths of 6–18 m, which can be customized to project requirements.
Welding methods include high-frequency welding (HFW) and submerged arc welding (SAW), allowing these pipes to meet the needs of diverse architectural and industrial applications.
Moreover, the unique rust-colored patina of weathering steel gradually transitions from bright orange to deep brown. The initial rust layer has a thickness of approximately 50–120 μm, offering both aesthetic appeal and long-term stability.
This natural appearance blends seamlessly with materials such as wood, concrete, and greenery, making Q355GNH pipes ideal for landscape sculptures, public art installations, and building facades.
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