桥梁用Q345qD钢板的生产实践

Production Practice of Q345qD Bridge Steel Plate

针对济钢中板厂生产工艺现状,制定了桥梁用钢Q345qD的工艺控制方案,设计了化学成分,针对生产工艺装备现状制定了再结晶型控轧+中间坯均匀冷却+未再结晶控制工艺,同时分析了取样温度对冲击性能的影响,形成了关键工艺参数与时效冲击性能的回归方程,对所生产的钢板进行了机械性能、金相组织分析,满足了用户的需求,提高了桥梁板生产能力。

Basing on the actual status of the middle plant factory,we instituted Q345qD bridge steel plate process control project, designed the chemical component.Also aimed to the actuality for the production process equipment,we set up the techniques about controlled rolling for recrystallization,uniform cooling of middle slab,controlled rolling of un-recrystallization,analyzed the effect which sampling temperature compared to the impact capability,and finished the regressive equation about the key process parameter and properties of ageing impact.We proceeded the analysis to the steel plate in mechanical capability and metallographic structure,which satisfied the user's requirement,improved the production capability of the bridge steel plate.