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UBC Theses and Dissertations
Heat transfer, oil lubrication and mould tapers in steel billets casting machines Chandra, Sanjay
Abstract
This study examines in detail the factors that influence mould-billet interaction and heat transfer during the continuous casting of steel billets. In an extensive three-year project, major industrial trials were held in three Canadian steel plants involving in each case an operating mould instrumented with arrays of thermocouples to record mould wall and mould cooling water tem peratures. Additionally, load cells were installed between the mould housing and the oscillator table to record mould-billet interaction. Linear variable displacement transducers were attached to the mould wall in order to monitor mould displacement. Measurements were made under different casting conditions - steel grades, types and flow rates of lubricating oils and mould tapers - and were recorded on a computer controlled data acquisition system. The liquid steel surface in the mould was also filmed during casting. Two existing mathematical models of the mould were modified and used to calculate the axial heat flux profiles and the dynamic distortion of the mould during service. A two-dimensional, finite-difference, heat-flow, mathematical model of the billet was developed to simulate solidifi cation and shrinkage as a function of axial position in the mould. The coefficient of thermal con traction of steel was estimated as a function of steel carbon content and temperature from experimental data in the literature Ofl the lattice parameter of and ‘ unit cells; this was particularly important to model the shrinkage of low-carbon steels. It has been shown that in theory, the low carbon steels (C
Item Metadata
Title |
Heat transfer, oil lubrication and mould tapers in steel billets casting machines
|
Creator | |
Publisher |
University of British Columbia
|
Date Issued |
1992
|
Description |
This study examines in detail the factors that influence mould-billet interaction and heat
transfer during the continuous casting of steel billets. In an extensive three-year project, major
industrial trials were held in three Canadian steel plants involving in each case an operating mould
instrumented with arrays of thermocouples to record mould wall and mould cooling water tem
peratures. Additionally, load cells were installed between the mould housing and the oscillator table
to record mould-billet interaction. Linear variable displacement transducers were attached to the
mould wall in order to monitor mould displacement. Measurements were made under different
casting conditions - steel grades, types and flow rates of lubricating oils and mould tapers - and
were recorded on a computer controlled data acquisition system. The liquid steel surface in the
mould was also filmed during casting.
Two existing mathematical models of the mould were modified and used to calculate the
axial heat flux profiles and the dynamic distortion of the mould during service. A two-dimensional,
finite-difference, heat-flow, mathematical model of the billet was developed to simulate solidifi
cation and shrinkage as a function of axial position in the mould. The coefficient of thermal con
traction of steel was estimated as a function of steel carbon content and temperature from
experimental data in the literature Ofl the lattice parameter of and ‘ unit cells; this was particularly
important to model the shrinkage of low-carbon steels. It has been shown that in theory, the low
carbon steels (C
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Extent |
11873758 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2008-12-16
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0078515
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1992-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.