Method for controlling the thickness of an intermetallic layer on a continuous steel product in a continuous hot-dip galvanizing process
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United States of America Patent
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Nov 20, 1990
Issued Date -
N/A
app pub date -
Oct 25, 1988
filing date -
Feb 27, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a method for controlling the thickness of an intermetallic layer on a continuous steel product in a continuous hot-dip galvanizing line. The steel product is rapidly cooled by quenching in a zinc bath and the structure of the coating to be formed on the steel product is controlled by directing a flow of molten zinc, cooled to a temperature 1.degree. to 15.degree. C. below the operating temperature of the zinc bath, towards the steel strip. At least a part of said flow is preferably directed towards the steel product close to its immersion point into the zinc bath, obliquely against the movement direction of the steel product.
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