METHOD FOR GALVANIZING AND GALVANNEALING EMPLOYING A BATH OFZINC AND ALUMINUM

摘要

The present application discloses a method for hot-dip galvanizing and galvannealing which employs a bath of zinc and aluminum. Strips are immersed in the bath to produce substantially dross-free galvannealed and galvanized strips. The bath can have substantially the same effective aluminum concentration during galvannealing as during galvanizing, and the temperatur e set-point of the bath is at a temperature of about 440 ~C to about 450 ~C. T he snout temperature of the strip is controlled between 470 ~C and 538 ~C, depending on the composition of the steel.