Can Q355 and S355JR be substituted for each other?
Generally, they can be approximated, but there are differences in impact temperature, upper limit of P/S, and Ceq. Important projects must adhere to design standards.
How is the corrosion resistance of Q355?
It is superior to ordinary carbon steel, but anti-corrosion coating (primer + topcoat) is still required. For outdoor/corrosive environments, Q355NH weathering steel is recommended.
How is the theoretical weight of Q355 steel plate calculated?
Formula: Weight (kg) = Thickness (mm) × Width (m) × Length (m) × 7.85 (density 7.85 g/cm³).
Common defects and control measures for Q355?
Internal: Delamination, inclusions (control during steelmaking and rolling);
Surface: Pitting, scratches (control during rolling, straightening, and packaging);
Performance: Strength/impact not meeting standards (strictly comply with GB/T 1591).
What are the storage and transportation precautions for Q355? Store indoors under a rain shelter to prevent rusting from prolonged exposure to rain; use wooden supports to prevent deformation; securely fasten during transport to avoid collisions and scratches.