A method of using sensible heat of hot steel slabs issuing from a continuous casting machine (CCM) in which it is possible to eliminate slab heating in furnaces prior to rolling. For this, hot slabs at a certain time are sent to a thermostat, where the temperature is equalized along their section and length, whereupon the slabs can be fed to the rolling mill. This achieves a significant savings of fuel and eliminates heating and oxidation of the metal in the furnace. To implement this method, one must first solve several problems: put the continuous casting machine on one technological line with the rolling mill and establish diagnostics for surface quality of the slabs directly on the exit from the continuous casting machine. In addition, it is necessary to have a fairly accurate mathematical model to calculate the slab temperature field for stationary and non-stationary modes of casting. The mathematical model proposed in the article is somewhat simplified and serves mainly for the communication of the main ideas.
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The authors examine one possibility of utilizing the heat of continuously cast workpieces (CCW) and correctly indicate the problems that may arise in the implementation of the project. It is necessary to develop a technology to produce defect-free CCW, as well as real-time quality control systems for the process parameters. The restructuring of the organization of metallurgical enterprise requires large investments; therefore, this project should be worked out in detail. Note that with this technology there arise problems when casting slabs under transient conditions; also, when rolled, cooled slab corners can lead to the formation of defects. It may be necessary to use, not a thermostat, but a checkpoint furnace of the type being used in the Casting and Rolling Complex at the Vyksa Metallurgical Plant, which will allow more flexibility to manage temperature control. It is also necessary to consider alternative options for heat recovery, for example, cooling the slab in a thermostat with a heat exchanger and feeding the working fluid into a turbine of type Organic Rankine Cycle (ORC).
Translated from Metallurg, No. 7, pp. 38–43, July, 2016.
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Lukin, S.V., Kibardin, A.N. Optimal Use of Physical Heat in Slabs Issuing from CCM. Metallurgist 60, 679–685 (2016). https://doi.org/10.1007/s11015-016-0351-2
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DOI: https://doi.org/10.1007/s11015-016-0351-2