Word: reheating
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Dates: during 1960-1969
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...CONTINUOUS CASTING. The idea is so obvious that Bessemer filed a patent on it 101 years ago, but complex production bugs stymied its use until recently. The ordinary method of casting is to pour the metal into ingot molds to harden, strip away the mold, reheat the ingot and roll it into semifinished shapes. Continuous casting eliminates these cumbersome steps. A ladle atop a tower pours white-hot steel into a 2-to-4-ft-deep oscillatfhg copper-lined mold. As the mold bottom is withdrawn, an unbroken billet of barely crusted steel creeps down through cooling water sprays...