Products Description
GB/T 4171 Q355GNH H-Beam is a high-strength, atmospheric corrosion-resistant structural steel manufactured under the Chinese national standard GB/T 4171.
Engineered for long-term exposure to outdoor environments, this H-beam combines robust mechanical performance with superior resistance to rust and weathering.
The Q355GNH grade indicates a minimum yield strength of 355 MPa, while the "GNH" designation highlights its high atmospheric corrosion resistance.
Alloying elements such as copper, chromium, and nickel enable the formation of a stable, protective oxide layer on the steel surface, preventing further corrosion and significantly extending service life.
Mechnical property for Q355GNH corten Beam
| Thickness (mm) | ||||
| Q355GNH | ≤ 16 | > 16 ≤ 40 | > 40 ≤ 60 | >60 |
| Yield strength (≥Mpa) | 355 | 345 | - | - |
| Tensile strength (Mpa) | 490-630 | |||
Chemical composition for Q355GNH corten Beam(Heat Analysis Max%)
| Main chemical elements composition of Q355GNH corten beam | |||||||
| 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 |
Products Application
Bridge and highway infrastructure:
Used as main girders, cross beams, and deck supports, Q355GNH H-Beams provide a minimum yield strength of 355 MPa and a tensile strength of 490–630 MPa, enabling them to withstand heavy vehicle loads and dynamic stresses. The material's atmospheric corrosion resistance allows bridges and overpasses to remain durable for 30–50 years with minimal maintenance, even in rainy or humid regions.
Railway and transportation structures:
Ideal for viaducts, overpasses, and supporting frameworks for trains and transportation vehicles. Q355GNH H-Beams maintain high toughness (impact energy ≥27 J at 0 °C) and dimensional stability, ensuring reliable performance under constant vibration and fluctuating loads. The self-protective oxide layer reduces repainting needs, lowering lifecycle costs for railway infrastructures.
Marine and port facilities:
Q355GNH H-Beams are suitable for docks, container cranes, and coastal steel structures exposed to salt-laden air and high humidity. Its corrosion rate is 2–8 times lower than ordinary carbon steel, providing long-term structural integrity in harsh marine environments.
Industrial and energy sectors:
Used in offshore oil platforms, derricks, and chemical/petroleum facility frameworks, Q355GNH H-Beams resist hydrogen sulfide (H₂S) and other corrosive media. With excellent weldability and controlled dimensional tolerance, they ensure structural safety and longevity in demanding industrial conditions.
Architectural and building structures:
Applied in outdoor façades, canopy supports, and corten-style architectural constructions, Q355GNH H-Beams combine structural performance with aesthetic appeal. The natural weathered surface layer not only protects against corrosion but also provides a distinctive rustic color, reducing maintenance while enhancing building design.
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