本发明提供一种B‑Nb‑N微合金化高强度耐候钢厚板及制备方法，属于金属材料技术领域。该耐候钢厚板化学成分重量百分比为：C 0.02‑0.08％，Si 0.10‑0.25％，Mn 1.30‑1.60％，P<0.030％，S<0.020％，Cr 0.30％‑0.35％，Cu 0.45‑0.70％，Ni 0.30‑0.50％，Mo 0.10‑0.30％，Nb 0.04‑0.06％，B 0.002‑0.004％，并且N/Nb：1/10‑1/8，其余为Fe。按该成分配比，将铸坯轧制成厚钢板，再通过热处理，最终得到耐候钢厚板。该耐候钢厚板具有显微组织和力学性能均匀一致、高耐蚀性的优点，可广泛应用于建筑和桥梁工程。

The invention provides a B-Nb-N microalloyed high-strength weather-proof steel thick plate and a preparation method and belongs to the technical field of metal materials. The weather-proof steel thick plate comprises the chemical components of, by weight, 0.02-0.08% of C, 0.10-0.25% of Si, 1.30-1.60% of Mn, less than 0.030% of P, less than 0.020% of S, 0.30-0.35% of Cr, 0.45-0.70% of Cu, 0.30-0.50% of Ni, 0.10-0.30% of Mo, 0.04-0.06% of Nb, 0.002-0.004% of B and the balance Fe, wherein the ratio of N to Nb is 1/10-1/8. Proportioning is conducted according to the components, a casting blank is rolled into the thick steel plate and then subjected to heat treatment, and finally the weather-proof steel thick plate is obtained. The weather-proof steel thick plate has the advantages that microstructures and mechanical performance are uniform and consistent, and corrosion resistance is high and the weather-proof steel thick plate can be widely applied to building and bridge engineering.