Q355GNH steel plate is a type of weather-resistant steel plate known for its excellent resistance to atmospheric corrosion. The "Q" signifies yield strength, "355" indicates the yield strength value, and "GNH" stands for "high weather resistance". It comes in grades A, B, C, D, E, denoted as Q355GNHA, Q355GNHB, Q355GNHC, Q355GNHD, Q355GNHE.
Q355GNH steel plate is primarily used for manufacturing vehicles, bridges, containers, buildings, and other structural components that require long-term usage in atmospheric environments.
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Q355GNH steel chemical composition(%) |
| Element | C | Si | Mn | P | S | Cr | Ni | Cu |
|---|---|---|---|---|---|---|---|---|
| Minimum | - | 0.25 | - | 0.07 | - | 0.3 | - | 0.25 |
| Maximum | 0.12 | 0.75 | 1 | 0.15 | 0.02 | 1.25 | 0.65 | 0.55 |
Notes:
To improve the steel's performance, one or more of the following trace alloying elements may be added: Nb (0.015%~0.060%), V (0.02%~0.12%), Ti (0.02%~0.10%), Alt (Aluminum) ≥ 0.020%. When combining these elements, ensure that at least one element meets the minimum content specified in the chemical composition.
Alloying elements that may be added include: Mo (≤ 0.30%), Zr (≤ 0.15%).
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Grade |
Q355GNH steel mechanical property |
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Yield Strength(MPa) |
Tensile Strength(MPa) |
% Elongation min |
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Q355GNH |
345-355 |
490-630 |
22 |
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We also supply Q355GNH Welded steel tubes with atmospheric corrosion resistance for structural purposes.
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