Founding Research Journal

Founding Research Journal

Effect of Temperature Variations, Thermal Stresses and Region of ‎Meniscus of Copper Mold on Quality of Billet Produced by Continuous Casting Process of Steel

Document Type : Original Research Article

Author
PhD Student of Metallurgy and Materials Engineering, School of Metallurgy and Materials, University of Tehran
10.22034/frj.2019.154760.1059
Abstract
The optimal quality of continuous casting is always one of the main concerns in the steel industry. ‎Copper mold is one of the main components of the continuous casting of steel. The physical, chemical and ‎mechanical phenomena that occur in the near-meniscus region play an important role in the surface ‎quality of the ingot. In this paper, several effective parameters including the effect of lubrication on the ‎mold surface, the formation of the meniscus and the formation of a specific type of galvanic cell on the ‎quality of the ingot have been investigated. According to the theory of molten ionic structure and ‎analysis of metallurgical slag, it can be said that the molten slag phase of the mold powder is an ionic ‎liquid (copper/iron), so that in the powder produced by stollberg, the force is driven to 1.9 volt. Based ‎on the cooling parameters of the copper mold, a three dimensional calculation model was created and a ‎three dimensional temperature, stress and thermal strain distribution was simulated numerically using ‎the finite element method (FEM) and the maximum deformation of the copper mold was about -0.04 ‎mm, The highest internal temperature of the copper tube is 2200°C and the maximum thermal stress of ‎‎390MPa. Based on the results, the largest difference in temperature from top to bottom of the mold is ‎not more than 10 degrees, and the maximum thermal deformation of the copper mold appears at a ‎position 30 mm below the meniscus, but not strong enough to cause cracking. In addition, the effect of ‎powder with different alkalinity on the characteristics of the oscillating marks on the surface of the ‎ingot was considered. Based on microscopic images of oscillation symptoms, it can be said that the use ‎of Scorialit powder makes the swinging signs shorter and with a lower depth than using the Accutherm ‎powder.‎
Keywords
Subjects

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Volume 2, Issue 4 - Serial Number 7
Spring 2019
Pages 227-237

  • Receive Date 04 November 2018
  • Revise Date 05 January 2019
  • Accept Date 15 March 2019