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对比研究了中厚板轧制Q345R及TMCP热连轧工艺下Nb、Ti微合金化处理的Q345R压力容器钢板的力学性能,分析了Nb、Ti微合金化的影响及显微组织与性能之间的关系。结果表明:低碳、Nb-Ti微合金处理的热连轧钢板组织细小均匀,消除了带状偏析,材料的冲击韧度提高2～3倍,断裂韧性较好,钢板的综合性能明显好于中厚板。晶粒细化及组织均匀化是材料韧性大幅度提高的主要原因。
The mechanical properties of the Q345R pressure vessel steel plate treated with Nb and Ti microalloyed in the Q345R and TMCP hot strip rolling processes were compared. The effects of microalloying of Nb and Ti and the relationship between microstructure and properties Relationship. The results show that the microstructure of the hot-rolled steel plate treated with low carbon and Nb-Ti micro-alloy is fine and uniform, and the strip segregation is eliminated. The impact toughness of the material is increased by 2 to 3 times and the fracture toughness is better. The comprehensive properties of the steel plate are obviously better than Plate. Grain refinement and homogenization of the material is the main reason for the substantial increase in toughness of the material.