Patent ID: 6177140
Filing Date: 2001-01-23
Classification: C23C

Abstract:
A method of producing galvanized or galvannealed steel from a single zinc bath comprising the steps of:providing a molten zinc bath having an effective aluminum concentration of about 0.10 wt % to about 0.14 wt %;maintaining a set-point of the bath at a temperature of about 440.degree. C. to about 450.degree. C. wherein the bath temperature is maintained within 1.degree. C. of the set point;circulating molten zinc to prevent an accumulation of dross in the bath;immersing the steel strip in the bath to coat the strip, wherein the strip has a snout temperature of about 470.degree. C. to about 538.degree. C.; andcontinuously directing a sufficient amount of molten zinc toward the immersed strip to cool the strip.