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

连铸与热轧工艺统一的可能性研究

• 批准号: 60550487
• 负责人: KOKADO Jun-ichi
• 金额: $ 1.22万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550487/
• 关键词: continuous casting; hot rolling; cast slab; slab temperature; meniscus; crater-end; bar thickness

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

这项研究的目的是从板坯温度的角度考察连铸和热轧过程统一的可能性。首先，建立了板坯从弯月面到漏斗端温度变化的数学模型，以及板坯厚度的增长过程。其次，计算了不同浇注条件下铸坯的温度过程和漏斗的位置。此外，还考察了保温层、拉坯速度和二冷区冷却强度对铸坯温度的影响，找出了生产可能存在高温的板坯的最佳条件。第三，我们建立了一个数学模型，可以准确地估计热轧过程中的板坯温度变化，并讨论了是否允许连铸板坯直接热轧。主要结果总结为…另外，如果铸坯在二冷区进行软冷却，控制板坯宽度方向的喷淋区和在板坯转角处设置保温层的尺寸适当，铸机端铸坯全断面平均温度可以保持在1200゜C。此外，我们还找到了一个最佳的冷却条件，使得整个板坯截面的温度历史可以保持在远离弯曲点的热脆范围。接下来，我们考察了从连铸机直接输送的板坯能否从温度的角度进行轧制。随着棒材厚度的增加，允许第一粗化机的初始温度较低。它的厚度超过55 mm，使我们能够将生产1.2 mm热卷所需的初始热轧温度降低到1200゜C以下，使终轧温度保持在临界点以上。总之，我们注意到，可以直接在线统一连铸和热轧工艺。较少

项目成果

小門純一 他: 京都大学工学部紀要. XLV【III】. 284-306 (1986)

Junichi Komon 等人：京都大学工程学院通报 XLV [III] 284-306 (1986)。

Jun-ichi Kokado, Natsuo Hatta und Hirohiko Takuda: "Temperaturkontrolle der Bramme bei der unmittelbaren Verbindung der Stranggie <beta> anlage mit der Warmbreitbandstra <beta> e" The Memoirs of the Faculty of Engineering, Kyoto University. XLVIII-3. 284-

Jun-ichi Kokado、Natsuo Hatta 和 Hirohiko Takuda：“Temperaturkontrolle der Bramme bei der unmittelbaren Verbindung der Stranggie <beta> anlage mit der Warmbreitbandstra <beta> e”京都大学工程学院回忆录。