Abstract
Continuous annealing can provide products for the automotive and appliance industries which exhibit more uniform mechanical properties, better shape (flatness), and cleaner surfaces than batch annealing. Continuous annealing (CA) is especially suited for the high-strength steel grades required by the automotive industry. Because of the rapid heating cycle encountered in continuous annealing, drawing-quality steels produced on a CA line do not have properties equivalent to steels produced by batch annealing (BA). However, the latest continuous-annealing technologies combined with proper control of chemistry, have developed products with properties approaching those obtained with BA. This paper reviews the metallurgical concepts of these technologies.
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