| 摘要 |
An apparatus for producing high strength steel sheet or a hot dip zinc plated high strength steel sheet being excellent in elongation and bore expanding characteristics, characterized in that a quenching device for cooling a steel sheet after recrystallization or after recrystallization and hot dip zinc plating to a temperature region of a martensitic transformation point or lower, a tempering device for tempering said steel sheet and keeping the temperature thereof and a re-cooling device for cooling said steel sheet to 100°C or lower are arranged in a continuous annealing device, a continuous hot dip zinc plating device or a device capable of being used for the two processes, or provided in connection with the continuous annealing or plating device. The above apparatus can produce a high strength steel plate or a hot dip zinc plated high strength steel plate which is improved not only in bore expanding characteristics but also in elongation by tempering, through the use of a quenching device and a tempering device as a continuous treating device.
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