Measurement and Prediction of Lubrication, Powder Consumption, and Oscillation Mark Profiles in Ultra-low Carbon Steel Slabs

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著者

    • SHIN Ho-Jung
    • Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)
    • KIM Seon-Hyo
    • Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)
    • THOMAS Brian G.
    • Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign
    • LEE Go-Gi
    • Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)

抄録

The flow of melted mold powder into the interfacial gap between the strand and the mold wall is important for productivity and quality in continuous cast slabs. Some of the mold slag (flux) consumption provides true lubrication, while much of the rest is trapped in the oscillation marks on the slab surface. This work presents measurements of powder consumption from extensive careful plant trials on ultra-low carbon steels, and a new, simple, semi-empirical model to predict slag consumption. The model predicts "lubrication consumption" by deducting the slag carried in the oscillation marks from the measured total. The oscillation mark shape is estimated from a theoretical analysis of equilibrium meniscus shape, which is based on metallographic analysis of many hook and oscillation mark shapes. The model demonstrates that the fraction consumed in the oscillation marks decreases with increasing casting speed, because the oscillation mark depth depends more on casting speed than on mold oscillation conditions. The model is validated by successful prediction of known trends of oscillation mark depth and mold powder consumption with changing various operation parameters. The model provides new insight into mold lubrication phenomena, which is important for extending casting operation to higher speeds and new lubrication regimes.

収録刊行物

  • ISIJ international

    ISIJ international 46(11), 1635-1644, 2006-11-15

    The Iron and Steel Institute of Japan

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