Characteristics
Q355GNH is a high-strength weathering steel known for its excellent atmospheric corrosion resistance. It forms a protective rust layer (patina) when exposed to the elements, which prevents further corrosion and reduces maintenance needs. This steel grade also offers good weldability, high tensile strength, and impact toughness, making it suitable for demanding structural applications.
Chemical Composition
Q355GNH contains alloying elements such as copper, chromium, nickel, and phosphorus, which enhance its weathering properties. Key components include:
Carbon (C): ≤0.12%
Silicon (Si): 0.10-0.40%
Manganese (Mn): 0.20-0.50%
Phosphorus (P): 0.07-0.15%
Sulfur (S): ≤0.035%
Copper (Cu): 0.25-0.45%
Chromium (Cr): 0.30-0.65%
Nickel (Ni): 0.12-0.65%
Delivery Condition
Q355GNH is typically delivered in hot-rolled or normalized conditions, ensuring optimal mechanical properties and surface quality for structural use.
Applications
Q355GNH is widely used in outdoor structures, including bridges, railway vehicles, transmission towers, and architectural facades. Its corrosion resistance and aesthetic rust-like appearance make it ideal for projects requiring durability and low maintenance in harsh environments.
