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Final report on Contract No 7210-PR/065, 1 July 1997 to 31 July 2001.

The project is concerned primarily with the development of a process enabling hot dip galvanised (GI) or galvannealed (GA) steel to be produced using the same spelter chemistry, with the advantage that no zinc bath change or major compositional change is required. (single-pot system).

The second part of this research was an investigation into the advantages/disadvantages of various additives in the Zn smelter during manufacture of GI and GA products, to improve coating properties such as corrosion resistance and microstructure.

The experimental work was laboratory based, and the conclusions from this were:

- Applying an inhibitive coating to the steel before immersion in a low aluminium smelter to produce GI without Fe-Zn intermetallics at the steel-coating interface did not succeed;

- A low strip entry temperature (<460°C), and zinc bath temperature (<450°C), in combination with an Al % > 0.12 % led to zinc coatings with good formability, weldability and corrosion resistance;

- GA coatings on TiNb-IF steel can be produced from a high (0.16% - 0.20% Al) Al spelter if GA temperatures of 520°C to 540°C can be reached in a production line with an induction furnace;

- A spelter with 0.25% Mn + 0.15 % Al can be used for GI with minor Fe-Zn intermetallics and good corrosion resistance and GA with an optimal microstructure.

Additional information

Authors: VLOT M J, Corus NL, IJmuiden (NL);ALONSO F J, Aceralia, Avilés (ES);COLAIACOVO F, CSM, Rome (IT);DEL PILAR PERDO A, Labein, Bilbao (ES)
Bibliographic Reference: EUR 20465 EN (2002), pp.170. Euro: 25.00
Availability: EUR-OP reference: KI-NA-20465-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-4235-2
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