Community Research and Development Information Service - CORDIS

Abstract

Strips for automotive applications are becoming thinner and thinner to lighten the weight of the cars. This practice needs to produce more and more galvanised high strength steels. These steels are, however, renowned for presenting galvanising problems like bare spots (bad zinc wetting) and adhesion failure.

The aim of this research is to determine the acceptable limits of alloying elements and propose new annealing practices to improve galvanisaton.

This study concludes that correct coatings can be produced in standard galvanising conditions if the additionof chromium or silicon in the steel composition is limited to 0.3 to 0.4 wt %. Some process modifications are needed to galvanise steel grades alloyed with higher alloying elements. Among all the possible process modifications, the increase of the air to gas ratio in the direct fire furnace is probably the most efficient procedure, but is also difficult to keep under control in a range of 1 to 1.5 g/m{2} to reach optimal wetting and good coating adhesion. Another low cost technique is to suppress the hydrogen in the soaking area to transform external to internal selective oxidation. The other possible process adoptions are too expensive, more complicated to implement or less efficient.

Additional information

Authors: BORDIGNON L, CRM, Liege (BE);VANDEN EYNDE X, CRM, Liege (BE);PRICE C, CORUS, IJmuiden (NL);KOLL T, Salzgitter AG, Salzgitter (DE), Thyssen Krupp Stahl AG, Duisburg (DE);BEIER F, Salzgitter AG, Salzgitter (DE), Thyssen Krupp Stahl AG, Duisburg (DE);MEURER M, ;WARNECKE W,
Bibliographic Reference: EUR 20954 EN (2004), 106 pp. Euro: 25
Availability: EUR-OP reference: KI-NA-20954-EN-S Available from EUR-OP sales agents URL: http://publications.eu/general/en/publications_en.htm
ISBN: ISBN: 92-894-7888-8
Record Number: 200417685 / Last updated on: 2004-08-27
Category: PUBLICATION
Original language: en
Available languages: en
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