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Galvannealing
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The galvannealing process is the heat treatment of galvanized sheet to promote the diffusion of Fe to Zn forming intermetalic Fe-Zn phases. Because of their varying morphology, structure and composition, these phases show different properties as far as the adhesion of the coating, corrosion, workability, weld-ability and coatability are concerned.
High frequency tests have shown that rapid heating, controlled holding and rapid cooling of the strip, enhance the development of the required intermetallic phase and thus the build-up of the appropriate metallurgical properties.
INDUCTOTHERM is the pioneer of heating systems for galvannealing at high frequency. Besides the use of high frequency transistor inverters, this equipment is distinguished by Inductotherm's patented doorless inductor.
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This type of high frequency inverter has the best efficiency and promotes uniform heating of the strip. The patented doorless inductors are specially designed to withstand the adverse effects of zinc dust and to facilitate maintenance.
The "high frequency inverter/doorless inductor" unit is assembled on one steel structure that is connected to the movable holding furnace. The complete pre-assembling in our workshop reduces the time and costs of installation and commissioning.
Edge Heating
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INDUCTOTHERM has also developed and patented a new type of induction edge heating system by using an inductor that automatically adjusts to a change of strip dimensions without any movement. This system could be added below the galvanneal heating assembly.
