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ABSTRACT
The main use of zinc and its alloys is to protect steel against corrosion, especially by galvanization. Forming is also a process of significant importance. Current methods for primary processing often call for continuous processes: horizontal continuous casting of thin plates and hot band rolling for flat products, continuous casting of round products followed by rolling, then drawing, for wires. Secondary processing relies on more traditional techniques that are also used for the other metals.
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Read the articleAUTHOR
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Ronald RACEK: Engineer from École Centrale de Paris - Doctor of Science - Head of Project Management at Umicore France
INTRODUCTION
The main use of zinc and its alloys is to protect steel against corrosion, notably through the galvanizing process.
Nevertheless, shaping is a process of considerable importance, particularly in Europe and more specifically in France.
The main process is rolling, mostly of flat products, mainly for building applications such as roofing, facades and rainwater drainage, a market that has been growing slightly for decades.
The particularities of zinc and zinc alloy forming processes, compared to other commonly used metals, derive partly from its hexagonal crystal structure, which results in highly anisotropic physical and mechanical properties, and partly from the fact that the transformation temperature is always close to the melting temperature.
Today's primary transformation processes make increasingly systematic use of continuous processes: horizontal continuous casting of thin plates and hot strip rolling for flat products, continuous casting of round products followed by rolling, then drawing, for wires.
Secondary transformation processes, on the other hand, call on more conventional techniques also used for other metals.
Lastly, surface treatments for flat-rolled products have been growing significantly over the past two decades.
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Shaping zinc and zinc alloys
General
Economic data
The world market for rolled products for the building industry (around 90% of total consumption) is around 300,000 t/year, with annual growth of 2%. Production and consumption vary widely from one country to another, depending above all on the traditions inherited from the previous two centuries.
Western Europe is largely dominant, but there is strong growth in consumption in new markets, notably...
Bibliography
References
Standardization
Association française de normalisation AFNOR
- Coverage – Metal – Shaped metal strips – Specifications - NF P 34-402 - 08 1987
- Coverage – Metal – Metal joint covers – Specifications - NF P 34-403 - 08 1987
- Rainwater drainage – Metal gutters, brackets and caissons – Specifications - NF P 36-402...
Organizations
France
Chambre syndicale du zinc et du cadmium (Fédération des chambres syndicales des minerais, minéraux industriels et métaux non ferreux) http://www.mineraux-et-metaux.org/fr/chambres/
Germany
Semi-finished product producers
Grillo Werke AG http://www.grillo.de/egrillo/fmag.htm
Jarden Zinc Products http://allzinc.com
Nedzink BV http://www.nedzink.nl/
...
Specifications. Regulations. Specifications
Center Scientifique et Technique du Bâtiment CSTB
NF P 34-211 09 2004
- Building work – Zinc sheet and long sheet metal roofs – Part 1 – technical specifications – Part 2: specifications. - DTU 40.41 -
P 36-201...
Manufacturers
Hazelett Strip-Casting Corporation http://www.hazelett.com
Continuus S.p.A. http://www.properzi.com/contacts.ctr
SMS Demag AG http://www.sms-demag.com/
...
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