Modeling of continuous-casting defects related to mold fluid flow

Brian G. Thomas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The quality of continuous-cast steel is greatly influenced by fluid flow in the mold, particularly at the meniscus. Recent examples of computational model applications at the University of Illinois are presented to investigate the formation of several different types of defects related to flow phenomena. The amount of gas injection into the tundish nozzle to avoid air aspiration is quantified by modeling. Computational model calculations of superheat transport and surface level fluctuations are presented. Meniscus defects, such as subsurface hooks and their associated inclusions, may form if the superheat contained in the steel is too low, or if top-surface level fluctuations are too large. A thermal stress model has been used to compute the distortion of the meniscus during a level fluctuation. Gas bubbles and inclusion particles may enter the mold with the steel flowing through the submerged nozzle. In addition, mold slag may be entrained from the top surface. These particles may be removed safely into the slag layer, or may become entrapped into the solidifying shell, to form sliver or blister defects in the rolled product. Transient, turbulent flow models have been applied to simulate the transport and entrapment of particles from both of these sources. The insights gained by these modeling efforts aid greatly in the development of processing conditions to avoid the formation of these defects.

Original languageEnglish (US)
Title of host publicationICS 2005 - Proceedings of the 3rd International Congress on the Science and Technology of Steelmaking
Pages847-861
Number of pages15
StatePublished - Dec 1 2005
EventICS 2005 - 3rd International Congress on the Science and Technology of Steelmaking - Charlotte, NC, United States
Duration: May 9 2005May 12 2005

Publication series

NameICS 2005 - Proceedings of the 3rd International Congress on the Science and Technology of Steelmaking

Other

OtherICS 2005 - 3rd International Congress on the Science and Technology of Steelmaking
CountryUnited States
CityCharlotte, NC
Period5/9/055/12/05

Keywords

  • Air Aspiration
  • Computational Fluid Dynamics
  • Continuous Casting
  • Gas Injection
  • Inclusion Entrapment
  • Level Fluctuations
  • Meniscus Hooks
  • Models
  • Mold Flow
  • Slag Entrainment
  • Solidification
  • Submerged Entry Nozzle
  • Surface Defects

ASJC Scopus subject areas

  • Engineering(all)

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