Abstract

Although continuous-sheet-annealing facilities have been used in the North American steel industry for several decades, their use has been largely restricted to certain products for which special metallurgical processing is required. These continuous-annealing (CA) facilities have not been competitive with batch annealing (BA) in producing the highly ductile and formable carbon-steel sheets required by the automotive and appliance industries. However, new technology has been developed over the last 10 years that can produce continuously annealed carbon-steel sheet with improved ductility. Furthermore, the new CA technology is more suitable than that of BA for producing the uniform high-strength sheets (from relatively lean steel compositions) that are increasingly being required by automobile manufacturers.

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