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August
2005 |
Development
of a New Crown/shape Control Model for Cluster Mills
Remn-Min Guo (left),
president, and Arif Malik (right), manager — product
and process applications, ContRolling Technology Intl. Inc.,
Dayton, Ohio (raymond.guo@icontrolling.com, malika@icontrolling.com)
This article discusses the two-dimensional transport matrix
theory of roll deflection in cluster mills. Several case studies
are addressed, including 12-high and 20-high mills. Roll behavior
under various loading
conditions is also explored. |
Advancements
in the Control of Solution Stain Using Fluid Dynamic Principles
Wolfgang Denker (left),
SMS Demag AG, Hilchenbach, Germany (wode@sms-demag.de); Michael
J. Peretic (center) and Joseph J. Saxinger (right), SMS Demag
Inc., Pittsburgh, Pa. (michael.peretic@sms-demag.us, joe.saxinger@sms-demag.us)
A
patented system employs fluid dynamic principles to manage
the movement of airborne coolant at the end of a mill stand,
preventing it from reaching the finished strip surface. This
article discusses the
configuration, operating principles and capabilities of that
system, and how it reduces surface defects. |
Modern
Plate Production Technologies With a Focus on Plate-Steckel
Mills
Nick J. Champion, VAI
Industries (UK) Ltd., Sheffield, United Kingdom (nick.champion@vai.co.uk)
Plate
mills are generally considered low-volume, interrupted processes
with poor operational efficiency. This article describes the
Plate-Steckel configuration, which increases the volume of conventional
plate mill production while reducing reheating and rolling costs. |
Design
of Rolling Mill Strip and Roll Cooling Systems
Santino A. Domanti
(left), research and development manager, W. John Edwards
(center), joint managing director, and Peter J. Thomas (right),
principal engineer, Industrial Automation Services, Teralba,
NSW, Australia (tdomanti@indauto.com.au, jedwards@indauto.com.au,
pthomas@indauto.com.au)
A
mill thermal simulation model was developed to assist in the
design of mill coolant and lubrication systems. The model
predicts roll and strip temperatures for different rolled
products and cooling configurations, and examples of these
applications are explored. |
Laminar
Flow Cooling Behavior of Wide Heavy-thickness Coils
Qiulin Yu (left), chief
metallurgist, Dan Dickinson, process engineer, and Jim Yerkes,
rolling mill manager, Nucor Steel–Tuscaloosa, Tuscaloosa,
Ala. (qyu@nucortusk.com, ddickinson@nucortusk.com, jyerkes@nucortusk.com);
and Jim Lewis (right), rolling and finishing manager, Nucor
Steel–Hertford, Cofield, N.C. (jlewis@nucorhertford.com)
Bottom cooling headers with double nozzles can minimize transverse
canoe (crossbow) and improve longitudinal uniformity of wide
heavy-thickness coils. A control model with proper ratios
of bottom flowrate to top flowrate is described, along with
three basic laminar flow patterns. |
Property
Measurements Toward Understanding Process Phenomena: Application
of Thermal Diffusivities in the Characterization of Cokes
and Mold Fluxes
M.
Hayashi, Department of Chemistry and Materials Science, Tokyo
Institute of Technology, Tokyo, Japan, and S. Seetharaman,
Department of Materials Science and Engineering, Royal Institute
of Technology, Stockholm, Sweden
In an effort toward developing experimental tools for understanding
process phenomena, thermal diffusivities of metallurgical
cokes as well as mold fluxes have been measured between room
temperature and 1,623 K and between room temperature and 1,023
K, respectively, in a flow of purified argon using a laser
flash technique in order to set forward the application of
thermal diffusivities in the characterizations of cokes and
mold fluxes. Thermal diffusivities of cokes and mold fluxes
are found to increase with increasing degree of crystallization.
The results imply that the thermal diffusivity of cokes could
be a good indicator of reactivity. Furthermore, the thermal
diffusivities of coke samples taken from various places of
a blast furnace could give some information regarding the
thermal history of the sample, and thus an idea regarding
the temperature distribution of the blast furnace. The thermal
diffusivities of the mold fluxes in crystalline state decrease
with increasing temperatures at lower temperatures and are
constant at higher temperatures.
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