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Synopsis : A study has been made of the effects of the cooling rate during solidification and the charging temperature prior to hot-rolling on the mechanical properties of cold-rolled sheet steels with deep drawability. The f-value deteriorates abruptly as the charging temperature decreases below 900°C in the batch-annealed low carbon Al-killed steel sheet hot-rolled from the ingot solidified in cast-iron mold to simulate the solidification condition of thin-slab casting, while f-value remains high even at the charging temperature of 600•Ž in sand mold sample to simulate the solidification condition of conventional continuous casting. The f-value of continuously annealed extra-low carbon Ti-bearing steel sheet hot-rolled directly from the ingot solidified in the cast-iron mold is about 2.0 and is same as that of sand mold sample. However, with decreasing the charging temperature, the f-value of sand mold sample decreases, whereas that of castiron mold sample remains almost constant.

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Effects of Cooling Rate during Solidification and Charging Temperature Prior to Hot-rolling on Mechanical Properties of Cold-rolled Sheet Steels with Deep Drawability