Method for controlling the thickness of an intermetallic layer on a continuous steel product in a continuous hot-dip galvanizing process

摘要

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° to 15° 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.