Knowledge

• 23/Oct2025

  How is the impact toughness test temperature of Q355NH determined?

  Q355NH’s impact toughness test temperature is primarily determined by its quality grade per GB/T 4171-2008, with supplementary adjustments based on the actual service environment (temperature, altitud

• 22/Oct2025

  How does the low-temperature toughness of S355J0W compare to S355K2W?

  S355K2W has far superior low-temperature toughness to S355J0W—it maintains ductility at -20°C, while S355J0W becomes brittle even at mild sub-zero temperatures. This makes S355K2W the only viable choi

• 22/Oct2025

  What are the specific differences in weather resistance between S355J0W and S...

  The core difference between S355J0W and S355K2W lies not in their base weather resistance, but in their guaranteed level of impact toughness (ductility) at low temperatures, which is a crucial indicat

• 22/Oct2025

  How to determine if the rust layer of S355J2W has been completely stabilized?

  To determine if the rust layer (protective patina) of S355J2W (a European EN 10025-5 weathering steel) is completely stabilized, you need to evaluate its physical appearance, structural integrity, and

• 22/Oct2025

  How to accelerate the uniformization of the rust layer after the installation...

  Accelerating the uniformization of the rust layer (protective patina) on Q295GNH— a Chinese standard (GB/T 4171) weathering steel—after installation focuses on controlling environmental conditions and

• 22/Oct2025

  What is the maintenance cycle of S355K2W in coastal areas?

  In most coastal areas, S355K2W requires 3–6 months of surface cleaning/inspection and 1–2 years of patina repair/weld checks to maintain performance. For harsher environments (e.g., near-shore, tropic

• 22/Oct2025

  What are the common defects in SMA570W welding?

  Common defects in SMA570W welding mainly stem from mismatched consumables, improper heat control, poor surface preparation, or incorrect process parameters—most of which directly harm the steel’s weat

• 22/Oct2025

  What special attention should be paid when welding SMA570W?

  SMA570W is a high-strength weathering structural steel specified in Japan’s JIS G3114 standard, designed for outdoor applications (e.g., bridges, building facades, transmission towers) where both atmo

• 21/Oct2025

  How to ensure the weathering performance of A588 after welding？

  Ensuring the weathering performance of A588 after welding requires preserving the steel’s corrosion-resistant properties across the weld zone, heat-affected zone (HAZ), and base metal—critical for mai

• 21/Oct2025

  What is the impact toughness of A588 at different temperatures?

  The impact toughness of A588—a high-strength low-alloy (HSLA) weathering steel specified in ASTM A588—varies significantly by grade (e.g., Grade A vs. Grade B) and temperature, following the general s