通过合理的成分设计及严格的控轧控冷工艺，成功开发了高强度120 mm厚Q460钢板，研究了轧制工艺对其显微组织和力学性能的影响。结果表明：不同轧制工艺下，试验钢板的显微组织均为铁素体加珠光体的混合组织，心部存在较明显的带状组织；提高轧制后的冷却强度，可略微提高钢板的强度，但其冲击韧性不会改善；提高待温厚度可在一定程度上细化铁素体及珠光体组织，减少带状组织，在强度基本不变的前提下显著提高钢板的冲击韧性。

By the reasonable composition design and uncompromising controlled rolling and controlled cooling process, 120 mm thick Q460 steel plate was developed successfully. The effects of rolling process on the microstructure and mechanical properties of the plate were investigated. The results show that under different process conditions, the basic microstructures of the tested plate all consisted of ferrite and pearlite and showed an obvious band-like shape in the core. The strength of the steel plate was slightly improved by the increasing cooling intensity after rolling while the toughness was not ameliorated. The ferrite and pearlite microstructures were obviously refined, the band-like microstructure amount decreased, and the toughness of the steel plate was significantly improved meanwhile the strength kept unchanged by the increase of the intermediate holding thickness.