Q355NH: The number "355" indicates its minimum yield strength is 355 MPa, with a tensile strength range of 470–630 MPa and elongation ≥20%. It has good weldability and forming performance, and is suitable for general cold bending and cutting processes.
Q460NH: The number "460" means its minimum yield strength reaches 460 MPa, with a tensile strength of 550–720 MPa and elongation ≥17%. It belongs to the high-strength weathering steel category, and its strength is about 30% higher than that of Q355NH, but its plasticity is slightly lower.
Q355NH: It is widely used in general weather-resistant structural parts that do not require high strength, such as building exterior walls, landscape guardrails, ordinary steel frames, and small-diameter pipes.
Q460NH: It is suitable for load-bearing structural parts that require both corrosion resistance and high strength, such as large-span steel structure components, heavy-duty mechanical supports, high-rise building load-bearing beams/columns, and port machinery parts.
Q355NH has better cold forming and welding adaptability, and is easier to process into complex-shaped components; Q460NH has higher strength and slightly higher requirements for welding materials and processes (low-hydrogen electrodes are recommended) to avoid welding cracks.
