Q345C高强度厚板TMCP工艺

On the TMCP Process of Q345C High Strength Heavy Plate Steel

介绍了Q345C厚70 mm钢板的TMCP工艺,实现了对钢的强度、塑性和韧性的控制,研究了控制轧制工艺和钢的组织性能之间的关系,分析了钢的组织形貌.结果表明,采用该无热处理的未再结晶区大压下量TMCP工艺试验的厚板,轧后无论采用空冷还是加速冷却,力学性能都满足GB/T1591-94的要求,且厚度方向力学性能均匀性良好;加速冷却钢板铁素体晶粒细化更为明显,表面与心部铁素体晶粒尺寸稍有差异.为现场生产厚70mm钢板提供了有力的依据,节省了能源,降低了生产成本.

TMCP process was applied to the rolling of 70mm-thick Q345C heavy plate steel to control its strength, ductility and toughness. Describes the process and investigates the relationship between the controlled rolling process and the microstructure and properties of the sreel as well as the structural morphologies. The results showed that the mechanical properties of the plate specimens thus rolled with heavy reduction in unrecrystallized zone and without heat- treatment can meat the requirements as listed in the Standard GB/T 1591-94, no matter what cooling type is taken （by air or accelerated）. The mechanical properties are well homogenized in thickness direction. Accelerated cooling enables the ferritic grains to be clearly finer, but the size of ferritic grains in surface layer and in core are slightly different. The results of investigation will provide a reference for energy saving and cost reducing in the production of 70 mm-thick heavy plates.