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本文研究了控制轧制后在线控制冷却速度对低碳C-Mn-Mo-Nb钢板力学性能和组织的影响。实验结果表明,当冷却速度≥10℃/s时,σs完全达到并超过X_(70)级,同空冷条件(1℃/s)相比,△σ_s可达8.5kgf/mm~2。随冷却速度的增加,铁素体晶粒和贝氏体组织被细化,选择最佳冷却速度可使钢材获得优良的综合性能。本文也对水的雾化冷却技术进行了初步研究。这种冷却方法的优点:1)冷却均匀;2)冷却速度控制范围广;3)容易调节;4)可省水50％以上。
In this paper, the effect of on-line controlled cooling rate on the mechanical properties and microstructure of low carbon C-Mn-Mo-Nb steel sheets after controlled rolling was investigated. The experimental results show that when the cooling rate is greater than or equal to 10 ℃ / s, the σs reaches and exceeds the X70 level completely, and the △ σ_s can reach 8.5kgf / mm ~ 2 compared with the air cooling condition (1 ℃ / s). With the cooling rate increases, the ferrite grains and bainite structure is refined, select the best cooling rate can make the steel to obtain excellent overall performance. This paper also conducted a preliminary study of water atomization cooling technology. The advantages of this cooling method: 1) uniform cooling; 2) wide range of cooling speed control; 3) easy to adjust; 4) water-saving more than 50%.