Study on possibility of unification between the continuous casting and hot rolling processes

研究的目的是从一个细胞实验室温度的一个角度来检验在连续的铸造和热滚动过程之间统一的可能性。第一，一个数学模型已经被估计为从一个菜单到一个临界点的变化，即一个良好的壳厚度的增长过程。第二，细胞实验室的温度过程和临界端的位置在各种铸造条件下进行了计算。此外，热绝缘器的影响，在细胞实验室温度的二级冷却区域中的流量和冷却强度受到了检测，以找到可能的高温度下生产slabs的最佳条件。第三，我们已经建立了这样的数学模型，即在热滚动过程中，细胞实验室的温度变化可能被准确地评估，并讨论无论何时或不连续的播细胞实验室都是允许的热滚动目录。主要结果已在这里汇总为 ... More 以下是：在铸造机器末端的整个扇区区域内的平均温度可以保持在1200 ° C处，如果该细胞在第二冷却区域内软冷却，并且如果控制喷雾冷却区域在该slab-宽度方向上良好，如热绝缘器的大小等于在该slab角落处适当地保持该slab角落的温度为高而可。在此之前，我们已经找到了一种最佳的冷却条件，即整个细胞实验室部分的温度历史可以保留在不弯曲点的热安置范围内。下一步，我们已经审查了什么样的实验室，或者不是直接从连续铸造机器上传送的，可以从温度的标准点滚动。在第一个跑步机上的初始温度被允许变得较低，而酒吧的厚度增加了。它比55毫米还能使我们在1200 ° C以下降低初始热滚动温度的必要条件，以生产1.2毫米热线圈，并保持最后滚动温度高于<Ar_3>临界点。在合并中，我们注意到，这是有可能统一连续铸造和热滚动过程直接在线。Less（低）

The purpose of the study is to examine the possibility of unification between the continuous casting and hot rolling processes from a point of view of a slab temperature. First, a mathematical model has been made to estimate the change in slab temperature from a meniscus to a crater-end as well as the growing process of shell thickness. Second, the temperature process of slab and the position of a crater-end have been calculated under various casting conditions. Also, the effect of the thermal insulator, the withdrawal velocity and cooling intensity at the secondary cooling zone on the slab temperature has been inspected to find out the optimal condition for producing slabs with a possibly high temperature. Third, we have built up a mathematical model such that the slab temperature change in the hot rolling process may precisely be assessed, and discussed whether or not the continuously cast slab is permissible to be hot-rolled directly.The main results clarified here are summarized as … More follows: The average temperature over the whole sectional area of a cast slab can be kept at 1200゜C at the casting machine end, if the slab is soft cooled at the secondary cooling zone, and if the control of spray cooling zone in the slab-width direction as well as the size of thermal insulator equipped at the slab corner is appropriate for keeping the slab corner temperature as high as possible. Furthermore, we have found an optimal cooling condition such that the temperature history over the whole slab section may remain aloof from the hot embrittlement range at the unbending point. Next, we have examined whether or not the slab transported directly from the continuous casting machine can be rolled from the standpoint of temperature. The initial temperature at the first rougher is allowed to be lower as the bar thickness is increased. Its thickness more than 55 mm enables us to drop the initial hot rolling temperature necessary for producing 1.2 mm hot coils below 1200゜C, keeping the final rolling temperature above the <Ar_3> critical point.In conclusion, we note that it is possible to unify the continuous casting and hot rolling processes directly on line. Less