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Abstract

Final report on Contract No 7210-PR/019, 1 July 1997 to 31 December 2000.

The aim of this project was to improve understanding of the related effects of scale formation and surface decarburisation that arise from oxidation during the reheating of steel in order to meet increasingly stringent surface quality requirements and decarburisation specifications of general, special and high-carbon steel products.

Quantitative oxidation data were obtained in contrasting thermobalance equipment, using samples ranging from 3 g to 20 kg. Parameters were derived for the classical oxidation equations corresponding to parabolic, mixed parabolic, paralinear, linear and logarithmic relationships, as appropriate. Application of these equations to predictive models is complicated by the discontinuous effect of compositional changes such as the carbon, silicon and phosphorous levels in the steel and the humidity of the atmosphere.

These tests were augmented by reheating and descaling trials, tests involving the deformation of the scale during hot working and investigation of decarburisation, notably comparison of methods of measurement and a study of the suppression of decarburisation by the presence of scale at low temperature.

A series of works trials were performed to provide a link between laboratory tests and plant practice. Test samples were monitored as they were transported through a reheating furnace. A process control model was developed invoking the principles studied in the project and incorporating a novel approach to handling changes in the composition of the atmosphere. Early delays in the experimental work were largely overcome, and the project broadly achieved its objectives.

Additional information

Authors: RODER M, BFI, Dusseldorf (DE);MARSTON H F, Corus UK Ltd, Rotherham (GB);RATCLIFFE R, Corus UK Ltd, Rotherham (GB);BOLT P H, Corus NL, IJmuiden (NL);VAN LANKVELD M, Corus NL, IJmuiden (NL);LANTERI V, IRSID, Maizières-lès-Metz (FR);LEPRINCE G, IRSID, Maizières-lès-Metz (FR);JARL M, MEFOS, Luleå (SV);NISKA J, MEFOS, Luleå (SV);KLIMA R, BFI, Düsseldorf (DE);RÔDER M, BFI, Düsseldorf (DE)
Bibliographic Reference: EUR 20497 EN (2002), pp.379. Euro: 57.00
Availability: EUR-OP reference: KI-NA-20497-EN-S Available from EUR-OP sales agents URL: http://publications.eu/general/en/publications_en.htm
ISBN: ISBN: 92-894-4390-1
Record Number: 200215642 / Last updated on: 2002-12-05
Category: PUBLICATION
Original language: en
Available languages: en
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