Method of producing hot-dip zinc coated steel sheet free of dross pick-up defects on coating and associated apparatus
OwnerPerti J. Sippolainventor
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Abstract
The present invention relates to a system and a method for using the system to provide a dross-free zinc bath for hot-dip galvanizing of steel strip or wire. The system includes the operation and apparatus for carrying out the operation of directing a zinc solution directly against both sides of a steel strip, along at least 50% of the processing length of the strip.
Claims16
A method of hot-dip galvanizing that eliminates substantially all suspended dross particles generated by galvanizing a metal strip to be coated, said method comprising the steps of:
- (a) inserting said metal strip into a bath containing galvanizing materials;
- and
- (b) adhering substantially all said dross to said metal strip by forcing substantially perpendicular zinc flows against said metal strip using a plurality of nozzles on each side of said metal strip wherein said zinc flows agitates said entire zinc bath and maintains chemical homogeneity throughout said zinc bath.
A system for carrying out a hot-dip galvanizing process of a steel strip in a zinc bath while maintaining said zinc bath in a substantially dross-free state, said system comprising a zinc bath through which a steel strip is passed, and a plurality of nozzles arranged in said bath on either side of said steel strip for directing zinc flows to said steel strip at a substantially perpendicular angle so that substantially all dross adheres to said steel strip and said zinc flows agitates said entire zinc bath and maintains chemical homogeneity throughout said zinc bath.
Dependencies are inferred from the claim text.