Knowledge

• 29/Sep2025

  What impact does the size of the bending radius have on the performance of SP...

  The size of the bending radius has a direct and significant impact on the mechanical properties, corrosion resistance, and structural integrity of SPA-H weathering steel after bending processing. As a

• 29/Sep2025

  How long can the corrosion resistance of Q235NHA weathering steel last?

  Q235NHA’s corrosion resistance is "environment-dependent." Under mild, well-maintained conditions, it can achieve a 50-year service life (matching the design life of most civil structures); in harsh e

• 29/Sep2025

  What should be noted when welding SPA-H weathering steel?

  The core principles for welding SPA-H are: "match weathering-grade consumables, control heat input, ensure clean joints, and avoid over-treatment". Following these guidelines ensures the welded struct

• 29/Sep2025

  What are the advantages of SPA-H corten steel in bridge construction?

  In bridge construction, SPA-H weathering steel’s core value lies in "long-term corrosion resistance + low life-cycle cost"—it not only ensures structural safety and durability but also simplifies cons

• 28/Sep2025

  How to remove unwanted rust from the surface of S235J2W weathering steel?

  Removing unwanted rust from S235J2W weathering steel requires balancing effective rust elimination and protection of the base metal/its ability to re-form a stable patina. Unwanted rust typically refe

• 28/Sep2025

  How does the rust color of S235J2W weathering steel change over time?

  ​​S235J2W’s rust color shifts from bright orange to dark gray over 6–12 months, marking the transition from unstable corrosion to a self-protective patina.

• 28/Sep2025

  How to prevent excessive corrosion of S235J2W weathering steel before stabili...

  Preventing excessive corrosion of S235J2W weathering steel before its surface forms a stable, protective patina (the "pre-stabilization" phase) focuses on minimizing exposure to aggressive corrosion t

• 28/Sep2025

  Will S235J2W weathering steel become brittle in low-temperature environments?

  S235J2W avoids brittleness at ≥-20°C for standard applications. Risk increases only in extreme cold (<-20°C), thick/welded parts, or with surface defects. For harsh low-temperature environments, use h

• 28/Sep2025

  Can the rust color of Q355NH weathering steel be changed through chemical met...

  Chemical methods can temporarily adjust weathering steel’s rust color (e.g., darkening, green tints, uniform tones) by reacting with rust or adding pigments. However, these changes are not permanent—t

• 28/Sep2025

  What pre-treatments are required for weathering steel products before use?

  Pre-treatments for weathering steel products before use primarily aim to remove surface barriers (contaminants, mill scale) that hinder patina formation, activate the steel surface for uniform oxidati