1. Q420qDNH atmospheric corrosion resistant bridge steel plate chemical composition (mass fraction) /%:
| Grade | C | Si | Mn | Nb | V | Ti | Cr | Ni | Cu | N | Al | Mo |
| Q420qNH | ≤0.11 | 0.15-0.5 | 1.1-1.5 | 0.01-0.1 | 0.01-0.1 | 0.006-0.03 | 0.4-0.7 | 0.3-0.4 | 0.25-0.5 | ≤0.008 | 0.015-0.05 | ≤0.20 |
2. Mechanical properties of Q420qDNH bridge steel plate:
| Grade | Quality level |
Yield strength ReL(N/mm2) | Tensile strength Rm/(N/mm2) | Elongation A/% | Impact energy (longitudinal) Akv/J | |||
| Plate thickness/mm | ||||||||
| ≤50 | >50-100 | >100-150 | Temperature | Min. | ||||
| Q420qNH | D | ≥420 | ≥410 | ≥540 | ≥19 | -20 | 120 | |
| E | -40 | |||||||
| F | -60 | 47 | ||||||
3. Z-direction performance of Q420qDNH steel plate: Q420qDNH-Z15, Q420qDNH-Z25, Q420qDNH-Z35.
4. The executive standard of Q420qDNH bridge steel plate is GB / T 714, which is a weather resistant bridge steel plate.
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