Abstract
Continuous Hot-Dip Galvanizing lines are widely used for the production of coated steel sheets. Quality improvement measures are of great importance for this type of line. A significant proportion of production and quality losses when operating these types of lines occurs when production is transitioning from one strip gauge/thermal cycle to another. Utilizing induction heating technology, in combination with a sophisticated control system, can dramically decrease yield losses during transitions. Dynamic Transition and Production Planning Models have recently been developed for the simulation and control of the continuous hot-dip galvanizing line. The results of this work have been implemented in some galvanizing lines with production rate up to 350,000-ton annual capacity.
Highlights
Hot-Dip Galvanizing is a process in which an adherent, protective coating of zinc and zinc compounds is developed on the surface of iron and steel products by immersing them in a bath of molten zinc
The range can be expanded by two points in either direction with no significant consequences other than an increase in the range of mechanical properties exhibited by the product
The protective atmosphere radiant tube furnace is installed after the directfired furnace to complete the heating of the strip and ensure optimal strip surface conditions to provide correct zinc adhesion in the subsequent operation
Summary
Hot-Dip Galvanizing is a process in which an adherent, protective coating of zinc and zinc compounds is developed on the surface of iron and steel products by immersing them in a bath of molten zinc. Steel for production of galvanized strip is brought to the heating equipment from the cold or hot rolling mill in a fully-hardened condition. It should be annealed to impart the necessary mechanical properties to meet the requirements for galvanized products. Heating and cooling rates, which are important variables in some continuous annealing processes, are not significant in the production of galvanized steel. Continuous annealing provides productivity where long runs and similar grades and strip sizes dominate the product mix. When dealing with many grades, strip sizes, and smaller orders, batch annealing makes sense because frequent change of heating cycles and dimensions of strip can bring about a 10-15% loss of strip in scrap in the all modern continuous galvanizing line (Dubois & Boyer, 1995). Implementation of induction heating in the continuous line can dramatically change the situation in favor of the continuous galvanizing line (Demidovitch, Nelson, & Blake, 2000)
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