Knowledge

• 25/Sep2025

  Does a thick plate of Q355NH require stress relief treatment after welding?

  Whether a thick plate of Q355NH requires stress relief treatment after welding depends on multiple factors, including plate thickness, welding process, structural design, and service conditions—it is

• 25/Sep2025

  Is the weather resistance and corrosion resistance of weathering steel the sa...

  , "weather resistance" and "corrosion resistance" of weathering steel are not the same thing—they describe related but distinct performance attributes, with weather resistance being a specialized subs

• 25/Sep2025

  What role do the Cu and Cr elements in the rust layer of weathering steel play?

  The copper (Cu) and chromium (Cr) elements in the rust layer of weathering steel are core functional components that drive the formation of a dense, protective "patina" (stable rust layer). Unlike the

• 25/Sep2025

  What are the differences in yield strength requirements between ASTM A588 and...

  There are distinct differences in the yield strength requirements between ASTM A588 (a high-strength low-alloy weathering steel standard from the United States) and Q355NH (a Chinese national standard

• 25/Sep2025

  How to accelerate the formation of rust layers on Q295NH outdoor sculptures?

  Accelerating the formation of the protective rust layer (patina) on a Q295NH outdoor sculpture involves a combination of proper surface preparation and active chemical stimulation.

• 25/Sep2025

  What is the required low-temperature impact toughness of Q355NH weathering st...

  The 34 J at -20°C requirement is a fundamental property that certifies Q355NH as a suitable and safe material for welded structures like bridges, towers, and buildings in regions experiencing cold win

• 25/Sep2025

  What are the recommended welding processes for Q355NH steel in low-temperatur...

  For Q355NH weathering steel in low-temperature applications (typically ≤0°C), recommended welding processes prioritize controlling heat input, minimizing hydrogen absorption, avoiding brittle microstr

• 24/Sep2025

  What are the main uses of Q355GNH high-strength weathering steel?

  Q355GNH is a high-strength weathering steel (conforming to Chinese standard GB/T 4171) with excellent corrosion resistance, high tensile strength (≥355 MPa), and good atmospheric aging resistance. Its

• 24/Sep2025

  Are there any special welding requirements for Q355NH steel in low-temperatur...

  Q355NH weathering steel requires specialized welding controls in low-temperature applications (typically ≤0°C) to prevent brittle fracture, ensure weld joint toughness, maintain weather resistance, an

• 24/Sep2025

  How does temperature affect the corrosion resistance of Q355NH weathering steel?

  Q355NH weathering steel, with its balance of high strength (yield strength ≥355MPa), atmospheric corrosion resistance, and cost-effectiveness, is applied across diverse temperature environments—with u