Products Description
Q355GNH Weathering Steel, also known as atmospheric corrosion-resistant steel, is a low-alloy steel that sits between carbon steel and stainless steel in terms of composition and performance.
Q355GNH steel is made by adding small amounts of corrosion-resistant elements such as copper and nickel to ordinary carbon steel.
Q represents yield strength.
355 indicates the lower yield strength limit of the steel in N/mm².
GNH stands for high atmospheric corrosion resistance.
The standard for Q355GNH weather-resistant steel is GB/T 4171-2008. Q355GNH weathering steel can be supplied in various forms, including hot-rolled, controlled-rolled, or normalized.
China GB/T 4171 Q355GNH Weather Resistant Steel Plate Chemical Composition
| Grade | C | Si | Mn | P | S | Cu | Cr | Ni |
| Q355GNH | 0.12 | 0.25-0.75 | 1 | 0.07-0.15 | 0.02 | 0.20-0.55 | 0.30-1.25 | 0.65 |
China GB/T 4171 Q355GNH Weather Resistant Steel Plate Mechanical Property
| Grade | Yield Strength(MPa) | Tensile Strength(MPa) | % Elongation in 2 in.(50mm) min |
| Q355GNH | 355 | 490-630 | 22 |
Products Application
Q355GNH Weather Resistant Steel has excellent rust resistance, high corrosion resistance, and benefits such as thinning, reduced consumption, labor savings, and energy efficiency.
Its corrosion resistance is significantly improved by adding small amounts of copper and nickel, making it ideal for long-term exposure to atmospheric conditions.
Q355GNH weathering steel is widely used in various industries, including:
Railways: For railway tracks, bridges, and tunnels, where durability is critical. The steel's tensile strength (≥ 355 MPa) and elongation (≥ 20%) ensure it can handle heavy loads and dynamic stresses.
Vehicles: Used in the production of steel parts for transportation like automobiles, trucks, and trailers, where high impact resistance and low maintenance are key.
Bridges: Common in bridge construction, Q355GNH can withstand harsh environmental conditions due to its high resistance to atmospheric corrosion. The steel is impact-tested at -20°C, ensuring reliability even in colder climates.
Towers: In communication towers, power transmission lines, and wind turbines, Q355GNH's resilience and low maintenance costs make it ideal for structural components exposed to the elements.
Steel Structures: Used in steel buildings, roofs, and facades, where its high strength (up to 490 MPa) and corrosion resistance extend the life of the structures with reduced need for coatings or treatments.
Containers for Hydrogen Corrosive Media: Due to its corrosion resistance, Q355GNH is used in the construction of containers and storage tanks for hydrogen gas, which can be highly corrosive to other materials.
The standard for Q355GNH is GB/T 4171-2008, ensuring it meets industry requirements for weather-resistant performance and structural integrity.
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