Galvanneal heating of strip

Details Galvanneal heating of strip Galvanneal heating of strip

C - Chemistry, Metallurgy

23

C

32/31, 117/114.1

C23C 2/28 (2006.01) C21D 9/60 (2006.01)

Patent

CA 2033940

An apparatus for galvannealing steel strip comprises an applying device for applying a coating of controlled thickness of a strip. A controller controls the thickness of the applied coating. A heating furnace heats the steel strip to produce a galvannealed product. Edge heaters for heating the edges of the steel strip by magnetic induction promote uniform temperature distribution across the steel strip. The uniform temperature distribution produces more uniform galvannealing in the product. The edge heaters have preselected operating frequencies. A modulating circuit imposes a frequency modulation on the operating frequencies of the edge heaters to avoid undesirable transverse flexural resonance in the galvannealed product.

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