Knowledge

• 15/Jul2025

  What problems will occur when Q500NH is subjected to vibration loads for a lo...

  Under long-term vibration loads, Q500NH risks fatigue cracking, corrosion-fatigue synergy, and fretting wear, especially in moist environments. Mitigate these by optimizing design stresses, applying p

• 15/Jul2025

  How does the performance of Q500NH change when exposed to rain for a long time?

  Q500NH develops a self-protecting patina under long-term rain exposure, significantly reducing corrosion after stabilization. While occasional runoff may cause superficial staining, its performance re

• 15/Jul2025

  What is the fatigue life of Q500NH when subjected to long-term alternating st...

  Q500NH’s fatigue life under long-term alternating stress is highly dependent on environment and stress range, with a typical fatigue limit of ~250–300 MPa in air but significantly reduced in corrosive

• 15/Jul2025

  How does Q500NH perform in environments containing nitrates?

  Q500NH weathering steel resists nitrates only in neutral, dry conditions, but suffers accelerated corrosion in acidic/wet nitrate-rich environments. Protective coatings or alternative materials are re

• 15/Jul2025

  How is the corrosion resistance of Q500NH in long-term contact with soil?

  Q500NH weathering steel exhibits poor corrosion resistance in long-term soil contact due to inconsistent patina formation and aggressive soil electrolytes. For buried applications, supplemental protec

• 15/Jul2025

  How does Q500NH perform in an environment containing ammonia?

  Q500NH weathering steel has limited resistance to ammonia (NH₃) environments, as ammonia can disrupt its protective oxide layer and accelerate corrosion, especially in humid or industrial settings. Fo

• 14/Jul2025

  How will the surface color of Q500NH change during long-term use?

  Q500NH transitions from orange-red to dark gray-black over 3–10 years, with the final hue influenced by climate (faster in humid areas, slower in arid zones). While color may vary slightly based on mi

• 14/Jul2025

  Will the performance of Q500NH degrade under long-term UV exposure?

  While UV exposure may influence the visual appearance of Q500NH over extended periods, it does not compromise the material's structural performance or corrosion resistance. The steel's weathering mech

• 14/Jul2025

  Is there any difference in the weather resistance of Q500NH in hot and humid ...

  Q500NH develops its protective patina faster in hot, humid climates but with slightly higher corrosion rates, while in dry climates it forms the patina more slowly but achieves better long-term protec

• 14/Jul2025

  Does Q500NH require any special post-treatment after welding?

  Q500NH typically requires no post-weld heat treatment for general use, but stress relief (550–600°C) is advised for thick sections or critical loads. Weld zones lose their patina temporarily and shoul