Plasticity problems during continuous casting

European Commission Directorate-General For Research And Innovation

Description

Steelmaking
Industrial research and development

Informations

• Publié par: EUROPEAN-COMMISSION-DIRECTORATE-GENERAL-FOR-RESEARCH-AND-INNOVATION
• Nombre de lectures: 29
• Langue: English
• Poids de l'ouvrage: 3 Mo

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ISSN 1018-5593 * * *
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European Commission
technical steel research
Steelmaking
Plasticity problems during
continuous casting European Commission
technical steel research
Steelmaking
Plasticity problems during
continuous casting
E. Lainez, J. C. Busturia
AcenorI+ D
Barrio U garte s/n
Apartado de Correos 152
E-48970 Basauri
Contract No 7210-CA/933
1 July 1989 to 31 December 1992
Final report
Directorate-General XII
Science, Research and Development
1995 EUR 16037 EN LEGAL NOTICE
Neither the European Commission nor any person acting on
behalf of the Commission is responsible for the use which might be made of the
following information
Cataloguing data can be found at the end of this publication
Luxembourg: Office for Official Publications of the European Communities, 1995
ISBN 92-826-9729-0
© ECSC-EC-EAEC, Brussels · Luxembourg, 1995
Reproduction is authorized, except for commercial purposes, provided the source is acknowledged.
Printed in Luxembourg CONTENTS
Page
1. INTRODUCTION 1
2 . PROCESS DETAILS
2.1. Billet Moulds
2.2. Mould Lubrication and Stirring 2
2.3.d Oscillation
2.4. Steel grades
3 . TRIAL DATA 2
3.1. Billet Transverse Section Assessment .... 2
3.2. Mould Wall Displacement and Temperatures. 3
4. NEW GEOMETRY MOULDS PRODUCTION TECHNIQUES .... 4
5. PERFORMED NEW GEOMETRY MOULDS PLANT TRIALS ... 5
5.1. New Corner Radii on 155 mm square Mould
Size 5
5.1.1. First Trials 6 ,.
5.1.2. Second Series of Trials. Sulphide
Morphology Assessment 7
5.1.3. End Product Results. Extension to
14 mm. Corner Radius
5.2. New Corner Radii on 185 mm square Mould
Size 7
5.2.1. First Trials. End Product Results. 8
5.2.2. Extended Research Work on 185 mm
square Billet 8
5.2.3. End Product Results Extension ....
5.3. New Mould Taper Performed Research 9
5.3.1. New Mould Taper on 155 mm. square
Mould 9
5.3.2. New Mould Taper on 185 mm. square
Mould 10
5.4. New Chamfered Corners Performed Research. 1
5.4.1. First Trials1
5.4.2. Extended Research Work on Chamfered
Corner Mould2
6. MOULD MONITORING PERFORMED RESEARCH 1
6.1. Preliminary Research Work3
III 6.2. Extended Research Work with Thermocouples 15
7. CONCLUSIONS 16
ACKNOWLEDGMENTS7
REFERENCES
TABLES9
FIGURES
PHOTOGRAPHIES
IV LIST OF TABLES
I - Main focussed steel grades specifications.
II. Billet transverse section assessment. List of Items.
III. Final heat chemical analysis of selected heats. 155
mm. sq. new corner radii mould trials.
IV. Billet transverse section measurements on 155 mm. sq.
mould.
V. Thermal contraction coefficient and initial distance
mould frozen shell.
VI. Final heat chemical compositions. Sulphide morphology
assessment on 155 mm. sq. new corner radii mould.
VII. Sulphide morphology. Heat E. Resulphurized %S = 0.076.
VIII.e. Heat F. Free machining %S =
0.284, %Pb = 0.24.
IX. Cold drawn material rejection. Leaded Low Carbon Free
Cutting steel grade heats.
X. Rolled end product. Rest of steel grades
heats.
XI. R = 6 mm and 14 mm. 185 mm. sq. trials. Final heat
chemical analysis.
XII. Percent, rolled redressed bars - R = 6 and R = 14, 185
mm. sq.
Off-corner cracks in 185 mm. sq. billets. XIII.
Final heat chemical analysis of end product controlled XIV.
heats.
XV. End product results. Extended trials.
XVI. Double taper mould results.
XVII. Statistical rhomboidity distribution on transverse
section samples with 0.9%/m. and 1.5%/m. taper moulds.
XVIII. Off-corner cracks incidence during the chamfered
corner mould first trials.
XIX. Rhomboidity results. Chamfered corner mould first
trials.
XX.y results. Chamfered corner mould extended
trials. XXI. Off-corner cracks incidence during the chamfered
corner mould extended trials.
XXII. Chemical analyses of selected heats. End product
quality control. Chamfered corner mould extended
trials.
XXIII. End product results. Chamfered corner mould extended
trials.
XXIV. Final heat chemical analyses. Mould distortion
measurement preliminary trials.
XXV. Mould distortion measured parameters. Preliminary
trials.
XXVI. Expansion and calculated mould temperatures.
Preliminary trials.
XXVII. Displacement and temperature monitoring. Chemical
analyses of monitored heats.
XXVIII. Obtained displacements and temperatures values.
VI LIST OF FIGURES
1. Transverse section sample. Geometry and primary structure.
2. Mounting of the sensor at the mould housing.
3. Layout for temperature and deformation sensors in a 185
mm. sq. mould according to E.L.V. solidification model in
billet casting.
4. Transverse location of sensors and thermocouples.
5.e arrangement of sensors.
6. Overview of thermocouple arrangement.
7. Billet transverse section geometry on 155 mm sq. samples.
8. Sulphide testing spots 1 and 2.
9. End product comparison for R = 6 mm and R = 14 mm, 185
mm.s q.
10. R6 - RIO off-corner cracks comparison.
11. R14-R10r cracks.
12. End product comparison for R = 6 mm and R = 14 mm, 185
mm.sq.
13. Double taper mould.
14. Chamfered corner obtained from 10 mm corner radius
recalibration.
15. Normal-Chamfered corner moulds off-corner cracks
comparison.
16. End product quality comparison normal-chamfered corner
moulds. Extended trials.
17. Location of two sensors in a 185 χ 185 mm. sq. mould.
18. Recorded traces of transducer signals example.
19. New moulds initial profiles at different sites.
20. Used mould finals att sites.
21. Recorded traces of transducers and thermocouples signals
example.
VII