Knowledge

• 27/Oct2025

  How does the composition of S355J0WP affect its low-temperature impact toughn...

  The composition of S355J0WP is engineered to balance strength, corrosion resistance, and low-temperature toughness through: Low carbon to avoid brittleness. Adequate manganese to neutralize impuriti

• 27/Oct2025

  What is the specific value of low-temperature impact toughness for S355J0WP?

  S355J0WP has a mandatory minimum low-temperature impact toughness of ≥27 J at 0°C (as defined by the "J0" grade and EN 10025-5:2019). For colder environments, it commonly meets an optional requirement

• 27/Oct2025

  Which one has better low-temperature impact toughness between Q355NH and S355...

  For applications where temperatures stay at or above 0°C, Q355NH offers adequate low-temperature impact toughness and meets a higher baseline at 0°C. However, in environments with temperatures droppin

• 27/Oct2025

  How to control the cooling rate during the normalizing process of Q355GNH steel?

  Controlling the cooling rate of Q355GNH during normalizing relies on matching the cooling method to workpiece thickness, real-time temperature monitoring, and pre/post-process quality checks. This ens

• 27/Oct2025

  Will the chemical accelerated rusting treatment of S355J0W affect the materia...

  Chemical accelerated rusting is a "service life-friendly" process for S355J0W when standardized. It solves the problem of slow natural patina formation and avoids early corrosion risks—its impact on s

• 27/Oct2025

  Under what circumstances is it necessary to perform re-rusting treatment on A...

  ASTM A588 is a high-strength low-alloy (HSLA) weathering steel renowned for its ability to form a dense, adherent protective rust layer (often called a “patina”) when exposed to natural atmospheric co

• 24/Oct2025

  Are there any alternative heat treatment methods for Q355GNH steel?

  While normalizing (+N) is the primary and most standard heat treatment for Q355GNH steel (per GB/T 4171), there are alternative methods tailored to specific application needs—such as optimizing low-te

• 24/Oct2025

  Are there any welding defects that commonly occur in Q355GNH welds and how to...

  Q355GNH welds are prone to specific welding defects due to its weathering steel composition (e.g., Cu, Cr) and sensitivity to heat input. Common defects include hydrogen-induced cracking (HIC), lack o

• 24/Oct2025

  How does the composition of Q355GNH affect its impact toughness?

  The composition of Q355GNH (a Chinese standard weathering steel) directly determines its impact toughness—especially low-temperature impact toughness—by influencing its microstructure, grain size, and

• 24/Oct2025

  What is the specific normalizing temperature and time for Q355GNH steel?

  As the core thermal process for Q355GNH steel, normalizing treatment (+N) has clear industry standards and parameter ranges for temperature and holding time. These parameters must be determined compre