On-line Detection of Quality Problems in Continuous Casting of Steel

Brian G. Thomas

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

Abstract

Quality problems in continuous casting of steel can be identified as they occur by monitoring mold signals (level sensor, thermocouples in the mold walls, friction etc.) and taking appropriate action (such as slowing casting speed, changing taper, changing a clogged nozzle, or later visual inspection of the surface for possible downgrading. Surface depressions and groups of deep oscillation marks form at meniscus and reduce local heat transfer as they move down the mold at the casting speed. This slows shell growth, increases shell surface temperature, and causes characteristic dips in mold thermocouple signals. More importantly, they are also associated with longitudinal cracks. Characteristic thermocouple signatures have been identified for many defects, including sticker breakouts, transverse depressions and deep oscillation marks, narrow-face bleeds, transverse corner cracks, longitudinal cracks, mold level fluctuation defects, and other problems. With the help of computational models, these mold signals should be used to troubleshoot defects, and to take appropriate corrective action.

Original languageEnglish (US)
Title of host publicationModeling, Control, and Optimization in Ferrous and Non-Ferrous Industry
EditorsF. Kongoli, B.G. Thomas, K. Sawamiphakdi
Pages29-45
Number of pages17
StatePublished - Dec 1 2003
EventMaterials Science and Technology 2003 Meeting - Chicago, IL, United States
Duration: Nov 9 2003Nov 12 2003

Publication series

NameMaterials Science and Technology 2003 Meeting

Other

OtherMaterials Science and Technology 2003 Meeting
CountryUnited States
CityChicago, IL
Period11/9/0311/12/03

Keywords

  • Continuous casting
  • Defect detection
  • On-line control
  • Thermocouple signals

ASJC Scopus subject areas

  • Materials Science(all)

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  • Cite this

    Thomas, B. G. (2003). On-line Detection of Quality Problems in Continuous Casting of Steel. In F. Kongoli, B. G. Thomas, & K. Sawamiphakdi (Eds.), Modeling, Control, and Optimization in Ferrous and Non-Ferrous Industry (pp. 29-45). (Materials Science and Technology 2003 Meeting).