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本文建立了水平连铸圆坯一维凝固传热数学模型。通过单向凝固实验,得出了碳紊钢(0.45％C)二次枝晶臂间距和平均冷却速度的关系:S_2=727R~(-0.41)。在现场铸坯上取样,测出其横截面上一些点的二次枝晶臂间距,利用以上关系式计算出相应各点的平均冷却速度。在试样(4炉6块)所对应的工艺条件下,用数学模型计算出每个试样相应各点的平均冷却速度。关系式计算和数学模型计算得到的两组数学值吻合较好,从而验证了数学模型的台理性。用数学模型计算结果设计了成都无缝钢管厂中断面水平连铸机的二冷装置。利用验证过的效学模型,可制定合理的二冷制度。
In this paper, a one-dimensional solidification and heat transfer mathematical model of horizontal continuous casting round billet was established. Through the unidirectional solidification experiment, the relationship between the secondary dendrite arm spacing and the average cooling rate of carbon steel (0.45% C) was obtained: S 2 = 727R ~ (-0.41). On-site slab sampling, measuring the cross-section of some secondary dendrite arm spacing, the use of the above formula to calculate the corresponding points of the average cooling rate. In the sample (4 furnace 6) corresponding to the process conditions, the mathematical model was used to calculate the average cooling rate of each sample corresponding to each point. Correlation calculation and mathematical model calculated two sets of mathematical values in good agreement, thus verifying the mathematical rationality of the model. Using the mathematical model to calculate the result, the secondary cooling device of the horizontal continuous caster in the section of Chengdu Seamless Steel Tube Plant was designed. Using the validated validation model, a reasonable secondary cooling system can be established.