The continuous hot-dip galvanizing and galvannealing line has an annual capacity of 450,000 tons (approximately 38,000 tons/month) and a rated capacity of 60 tons per hour. The line is designed to coat cold rolled strip for automotive and appliance applications.
The line -- with an overall length of 950 feet and 3,500 feet in process strip – is five sections: entry, furnace, coating, process and delivery. The entry section includes a high-current-density electrolytic cleaning section, two payoff reels, two thickness gauges, two flatteners and two cross-cut shears. The furnace section has a high-current-density electrolytic cleaning section, scrubbers, an air drying section; and a vertical accumulator with a storage capacity of 984 feet. The coating section includes a 245-ton-capacity zinc pot that operates at 460°C, air/nitrogen gas knives for coating control. There is an induction furnace for producing galvanneal product as well as a cooling tower followed by a water quench tank.
The process section includes surface treatment units for phosphatizing and chromatizing. There is a vertical accumulator followed by an inspection station for vertical and horizontal surface examination, a noncontact continuous inkjet printer for strip identification, and an electrostatic oiler.
The delivery section includes an x-ray thickness gauge, cross-cut shear, edge trimmer, a scrap removal system, and an electronic edge guide system that provides uniform winding on a delivery reel.
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