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Hot dip coating of high strength low carbon steels. / Geraint Wyn Lodwig

Swansea University Author: Geraint Wyn Lodwig

Abstract

In response to increasing demand for high strength automotive steels, the development of galvanised dual phase steels has become more significant in recent years. At present, a requirement for galvanised high strength steels with tensile strengths in excess of 600 MPa exists within the automotive in...

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Published: 2004
Institution: Swansea University
Degree level: Doctoral
Degree name: EngD
URI: https://cronfa.swan.ac.uk/Record/cronfa42742
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first_indexed 2018-08-02T18:55:26Z
last_indexed 2018-08-03T10:10:58Z
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spelling 2018-08-02T16:24:30.3050039 v2 42742 2018-08-02 Hot dip coating of high strength low carbon steels. a71fe7731a3aa62aa74b30c768767e62 NULL Geraint Wyn Lodwig Geraint Wyn Lodwig true true 2018-08-02 In response to increasing demand for high strength automotive steels, the development of galvanised dual phase steels has become more significant in recent years. At present, a requirement for galvanised high strength steels with tensile strengths in excess of 600 MPa exists within the automotive industry. The present programme focuses on seven C-Mn based steels, each steel varying in key additions such as silicon, chromium, vanadium, molybdenum and niobium. A composition range wt% of C (0.07-0.2), Mn (1.3-1.5), Si (0.05-1.3), Cr (0.05-0.45), V (up to 0.01), Mo (up to 0.01) and Nb (0.001-0.01) was studied. In order to attain these wide-ranging steel chemistries, both commercially produced and laboratory cast steels were used for this project. All steels had the required chemistry for dual phase steel production, but only if a suitable annealing cycle was used. As a result, all steels were subjected to a range of annealing cycles on a laboratory-annealing simulator, based on current continuous annealing/galvanising line schedules utilised by the Corus Group. Steels identified as dual phase steels from annealing experiments by microstructural and mechanical property analysis were subjected to laboratory galvanising. The zinc coating applied to these steels has been studied to evaluate the quality of the galvanised steel. This investigation, which has utilised a galvanising simulator, has demonstrated that during standard galvanising practices, problems known as dewetting affected the coating quality. Unfortunately, this issue was most prevalent with the steels displaying the most suitable metallurgical properties. Nevertheless, the wetting performance could be vastly improved by varying processing conditions such as annealing furnace dew point and strip entry temperature. E-Thesis Materials science. 31 12 2004 2004-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral EngD 2018-08-02T16:24:30.3050039 2018-08-02T16:24:30.3050039 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Geraint Wyn Lodwig NULL 1 0042742-02082018162518.pdf 10807511.pdf 2018-08-02T16:25:18.4000000 Output 10864815 application/pdf E-Thesis true 2018-08-02T16:25:18.4000000 false
title Hot dip coating of high strength low carbon steels.
spellingShingle Hot dip coating of high strength low carbon steels.
Geraint Wyn Lodwig
title_short Hot dip coating of high strength low carbon steels.
title_full Hot dip coating of high strength low carbon steels.
title_fullStr Hot dip coating of high strength low carbon steels.
title_full_unstemmed Hot dip coating of high strength low carbon steels.
title_sort Hot dip coating of high strength low carbon steels.
author_id_str_mv a71fe7731a3aa62aa74b30c768767e62
author_id_fullname_str_mv a71fe7731a3aa62aa74b30c768767e62_***_Geraint Wyn Lodwig
author Geraint Wyn Lodwig
author2 Geraint Wyn Lodwig
format E-Thesis
publishDate 2004
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description In response to increasing demand for high strength automotive steels, the development of galvanised dual phase steels has become more significant in recent years. At present, a requirement for galvanised high strength steels with tensile strengths in excess of 600 MPa exists within the automotive industry. The present programme focuses on seven C-Mn based steels, each steel varying in key additions such as silicon, chromium, vanadium, molybdenum and niobium. A composition range wt% of C (0.07-0.2), Mn (1.3-1.5), Si (0.05-1.3), Cr (0.05-0.45), V (up to 0.01), Mo (up to 0.01) and Nb (0.001-0.01) was studied. In order to attain these wide-ranging steel chemistries, both commercially produced and laboratory cast steels were used for this project. All steels had the required chemistry for dual phase steel production, but only if a suitable annealing cycle was used. As a result, all steels were subjected to a range of annealing cycles on a laboratory-annealing simulator, based on current continuous annealing/galvanising line schedules utilised by the Corus Group. Steels identified as dual phase steels from annealing experiments by microstructural and mechanical property analysis were subjected to laboratory galvanising. The zinc coating applied to these steels has been studied to evaluate the quality of the galvanised steel. This investigation, which has utilised a galvanising simulator, has demonstrated that during standard galvanising practices, problems known as dewetting affected the coating quality. Unfortunately, this issue was most prevalent with the steels displaying the most suitable metallurgical properties. Nevertheless, the wetting performance could be vastly improved by varying processing conditions such as annealing furnace dew point and strip entry temperature.
published_date 2004-12-31T03:53:33Z
_version_ 1763752661725741056
score 11.013015

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