By means of alloying of Cu, P, Cr and Ni, GB/T 4171 Q355GNH steel plates can form a protective layer on the surface of the metal substrate. Thereby GB/T 4171 Q355GNH steel plates have higher atmospheric corrosion resistance. The weatherability of Q355GNH steel is better than that of weathering steel for welded structure, so Q355GNH steel is also called Q355GNH high weatherability structural steel.
GB/T 4171 Q355GNH steel plates chemical composition:
| Grade | C | Si | Mn | P | S | Cu | Cr | Ni |
| Q355GNH | 0.12 | 0.25-0.75 | 1 | 0.07-0.15 | 0.02 | 0.20-0.55 | 0.30-1.25 | 0.65 |
GB/T 4171 Q355GNH steel plates mechanical properties:
| Grade | Yield Strength(MPa) | Tensile Strength(MPa) | % Elongation in 2 in.(50mm) min |
| Q355GNH | 355 | 490-630 | 22 |
GB/T 4171 Q355GNH steel plates are widely used in railway vehicles, various weather resistant building structures, especially for industrial atmospheric environment, and bridge auxiliary structures.
Just like you, 70% customers choose long-term cooperation with BBN steel not only for our good product and service quality, good reputation in the international market, but also for our experienced one-stop raw material supply and further steel processing!
