Control and optimization of the galvannealing process
Galvannealing is a process which improves corrosion resistance, paintability and the weldability of steel strips. The strip is reheated after a hot-dip coating in a zinc bath, in such a way that some iron coming from the steel strip diffuses through the zinc coating. This diffusion results in several phases forming. These are composed of iron-zinc intermetallic compounds whose characteristics are related to numerous parameters, such as the thermal cycle. In order to assess the relationship between the galvannealed product properties and the specific parameters of the process, the partners had to attain optimal conditions which reduced the amount of powdering during the press forming process. An understanding was reached of the mechanisms controlling the diffusion process and the relationships between the phases of coating and powdering. New technologies employing optimal process conditions have been designed and tested. Equipment which is needed to carry out an optimal thermal cycle have been implemented in line with mathematical models.
Bibliographic Reference: EUR 18521 EN (1998) 69pp.
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Record Number: 199910040 / Last updated on: 1999-02-11
Original language: en
Available languages: en