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Effect of mould flux on scale adhesion to reheated stainless steel slabs
Dissertation (MSc)--University of Pretoria, 2009.
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University of Pretoria
2013
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| _version_ | 1867613510634045440 |
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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 | © 2008, 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 (MSc)--University of Pretoria, 2009. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/29840 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:37:18.025Z |
| 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:2263/29840 Effect of mould flux on scale adhesion to reheated stainless steel slabs Pistorius, Petrus Christiaan jeanjacquesmukadi@yahoo.fr Ndiabintu, Mukadi Jean-Jacques Scale Chromite Tendrils of nickel-rich filigree Austenite grain boundaries Interfacial morphology Free oxygen Stainless steel Mould flux Reheating Hydraulic descaling Internal oxidation UCTD Dissertation (MSc)--University of Pretoria, 2009. Effects of mould flux contaminant on scale-steel adhesion and hydraulic descaling of scale formed on slabs were investigated. In this investigation, stainless steel type 304 (austenitic with 18% Cr and 8% Ni) and specific mould fluxes were used when growing the scale on contaminated samples under simulated industrial reheating conditions, with subsequent high pressure water hydraulic descaling. The basic hypothesis was that the steel-scale adhesion depends on the microstructure of different phases present in the scale, the segregation of specific elements at the interface and the interfacial morphology of the scale after reheating. It was found that mould flux contaminant decreases scale-steel adhesion and therefore improved the descaling effectiveness significantly compared to non contaminated stainless steel. The descaling effectiveness of contaminated and uncontaminated slab was dependent to the presence of metal free paths (chromite layers along the austenite grains boundaries) and the presence of unoxidized metal in the scale due to nickel enrichment at the interface. Compared to the uncontaminated samples, the descaling of contaminated samples was efficient which could be due to the fact that some mechanisms which increase scale– steel adhesion (notably nickel enrichment at the interface) were considerably reduced. For all contaminated samples, the descaling effectiveness after visual observation were close to 100% and it was found that mould flux type 832 ( low basicity) gave a high descaling efficiency with better steel surface quality after descaling compared to mould fluxes type 810 and RF1. Materials Science and Metallurgical Engineering unrestricted 2013-09-07T16:53:44Z 2009-12-09 2013-09-07T16:53:44Z 2009-09-02 2009-12-09 2009-11-26 Dissertation Ndiabintu, Mukadi, J-J 2008, Effect of mould flux on scale adhesion to reheated stainless steel slabs, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/29840 > E1466/ag http://hdl.handle.net/2263/29840 http://upetd.up.ac.za/thesis/available/etd-11262009-192807/ © 2008, 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 application/pdf application/pdf application/pdf application/pdf application/pdf University of Pretoria |
| spellingShingle | Scale Chromite Tendrils of nickel-rich filigree Austenite grain boundaries Interfacial morphology Free oxygen Stainless steel Mould flux Reheating Hydraulic descaling Internal oxidation UCTD Effect of mould flux on scale adhesion to reheated stainless steel slabs |
| title | Effect of mould flux on scale adhesion to reheated stainless steel slabs |
| title_full | Effect of mould flux on scale adhesion to reheated stainless steel slabs |
| title_fullStr | Effect of mould flux on scale adhesion to reheated stainless steel slabs |
| title_full_unstemmed | Effect of mould flux on scale adhesion to reheated stainless steel slabs |
| title_short | Effect of mould flux on scale adhesion to reheated stainless steel slabs |
| title_sort | effect of mould flux on scale adhesion to reheated stainless steel slabs |
| topic | Scale Chromite Tendrils of nickel-rich filigree Austenite grain boundaries Interfacial morphology Free oxygen Stainless steel Mould flux Reheating Hydraulic descaling Internal oxidation UCTD |
| url | http://hdl.handle.net/2263/29840 http://upetd.up.ac.za/thesis/available/etd-11262009-192807/ |