Knowledge

• 29/Jul2025

  Will the weather resistance of Q460NH decrease in industrially polluted areas...

  Q460NH's weather resistance is reduced in heavily polluted industrial areas due to acid rain and sulfur compounds, though it still outperforms carbon steel. For optimal performance in such environment

• 29/Jul2025

  How long does it take for the self-protective rust layer of Q460NH to form?

  The protective rust layer on Q460NH weathering steel typically stabilizes within 6-24 months, forming faster in wet climates but slower in arid or marine environments.For optimal corrosion resistance

• 29/Jul2025

  Does Q460NH need painting?

  Q460NH weathering steel forms a protective rust layer and typically doesn't require painting in dry atmospheres. However, painting is recommended for marine/splash zones or when aesthetics are importa

• 29/Jul2025

  What is the corrosion resistance of Q460NH in marine environment (high salt s...

  Q460NH weathering steel offers moderate to high corrosion resistance in marine environments (2-4x better than carbon steel) by forming a protective rust layer, though it requires coatings for prolonge

• 28/Jul2025

  What are the standard values of mechanical properties (tensile strength, yiel...

  Q460NH weathering steel has minimum mechanical properties of 460 MPa yield strength, 550-720 MPa tensile strength, and ≥17% elongation (per EN 10025-5). Its corrosion-resistant alloy composition (Cu,

• 28/Jul2025

  Which welding materials (electrodes, wires) are suitable for Q460NH?

  For welding Q460NH weathering steel, use low-hydrogen electrodes (e.g., AWS E8018-W2) or Ni/Cr-alloyed wires (e.g., ER80S-Ni1) to match its corrosion resistance and mechanical strength. Always follow

• 28/Jul2025

  Are there any special requirements for cutting and drilling of Q460NH?

  While Q460NH can be cut/drilled like standard steel, edge smoothness and cleanliness are critical to maintain its weathering properties. Always prioritize methods that minimize HAZ and surface defects

• 28/Jul2025

  Does cold bending or hot forming affect the weather resistance of Q460NH?

  While both methods are feasible, cold bending is less likely to compromise Q460NH’s weather resistance if done correctly. Hot forming requires stricter controls to maintain corrosion performance. Alwa

• 28/Jul2025

  Does Q460NH need heat treatment after welding?

  PWHT is not always mandatory but is recommended for thick sections or high-stress applications to ensure long-term performance. Always validate with engineering standards and weld procedure qualificat

• 28/Jul2025

  Q460NH What issues should be paid special attention to when connecting?

  Q460NH weathering steel requires special attention during welding and bolting to maintain its corrosion resistance and structural integrity. Key considerations include preheating, compatible filler me