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Effect of titanium pick-up on mould flux viscosity in continuous casting of titanium-stabilised stainless steel
Dissertation (M Eng (Metallurgical Engineering))--University of Pretoria, 2006.
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University of Pretoria
2013
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| _version_ | 1867613435405008896 |
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| access_status_str | Open Access |
| author2 | Pistorius, Petrus Christiaan |
| author_browse | Pistorius, Petrus Christiaan |
| author_facet | Pistorius, Petrus Christiaan |
| collection | Thesis |
| dc_rights_str_mv | © 2003, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (M Eng (Metallurgical Engineering))--University of Pretoria, 2006. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/28075 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:06.245Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/28075 Effect of titanium pick-up on mould flux viscosity in continuous casting of titanium-stabilised stainless steel Pistorius, Petrus Christiaan upetd@up.ac.za Mukongo, Tshikele Titanium nitride Flux metallurgy viscosity Perovskite Titanium steel Austenitic steel Ferritic steel UCTD Dissertation (M Eng (Metallurgical Engineering))--University of Pretoria, 2006. The behaviour of mould fluxes used in continuous casting of two Ti-stabilised stainless steels was investigated in terms of the level of titanium pick-up by the flux and the effect of this absorption of titanium on the viscosity of the fluxes. The two fluxes considered are respectively used for the casting of a ferritic steel (type 409) and an austenitic steel (type 321). Concerning the titanium pick-up (expressed as Ti02), the Ti02 content of the flux stabilised at about 3-4% for the mould flux of the ferritic steel and at about 6% for the mould flux of the austenitic steel after 20 minutes of casting. At the same time due to the reduction of Si02 in the molten flux by TiN and Ti in the steel the basicity of the mould flux of the ferritic steel increased from 0.8 to 0.9 while it increased from 0.95 to 1.2 for the mould flux of the austenitic steel. The SEM/EDS analysis of the sampled flux during casting showed only some spherical metallic droplets in the case of the mould flux of the ferritic steel but for the mould flux of the austenitic steel apart from the metallic droplets, some precipitates rich in Ca, Ti and O were identified in the glassy phases. Rotational viscometry carried out on the two fluxes showed that there is a decrease in the viscosity of the fluxes with the absorption of Ti02, Ti2O3 and Ti3O5 in the range of 2 to 10 wt%, for temperatures from 1400°C to 1200°C. The effect of Ti02 and Ti2O3 has been tested with the mould flux of the austenitic steel at a basicity of 1.2 to match the basicity which arises during casting. For temperatures of 12500C and below, the apparent viscosity of the flux increased markedly with the absorption of 10 % of Ti02 or Ti2O3. In both cases precipitation of perovskite (Ca2 Ti2O6 or Ca2 Ti2O5) was found to be responsible for the increase of the apparent viscosity of the flux of the austenitic steel. Materials Science and Metallurgical Engineering unrestricted 2013-09-07T12:49:47Z 2005-09-23 2013-09-07T12:49:47Z 2003-03-06 2006-09-23 2005-09-21 Dissertation Mukongo, T 2003, Effect of titanium pick-up on mould flux viscosity in continuous casting of titanium-stabilised stainless steel , MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/28075 > H641/ag http://hdl.handle.net/2263/28075 http://upetd.up.ac.za/thesis/available/etd-09212005-124113/ © 2003, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Titanium nitride Flux metallurgy viscosity Perovskite Titanium steel Austenitic steel Ferritic steel UCTD Effect of titanium pick-up on mould flux viscosity in continuous casting of titanium-stabilised stainless steel |
| title | Effect of titanium pick-up on mould flux viscosity in continuous casting of titanium-stabilised stainless steel |
| title_full | Effect of titanium pick-up on mould flux viscosity in continuous casting of titanium-stabilised stainless steel |
| title_fullStr | Effect of titanium pick-up on mould flux viscosity in continuous casting of titanium-stabilised stainless steel |
| title_full_unstemmed | Effect of titanium pick-up on mould flux viscosity in continuous casting of titanium-stabilised stainless steel |
| title_short | Effect of titanium pick-up on mould flux viscosity in continuous casting of titanium-stabilised stainless steel |
| title_sort | effect of titanium pick up on mould flux viscosity in continuous casting of titanium stabilised stainless steel |
| topic | Titanium nitride Flux metallurgy viscosity Perovskite Titanium steel Austenitic steel Ferritic steel UCTD |
| url | http://hdl.handle.net/2263/28075 http://upetd.up.ac.za/thesis/available/etd-09212005-124113/ |