Jfe Steel Corporation

Yukako Katayama

Takashi Matsumoto

Satoshi Ueoka

Yuta Tamura

Sonomi Shirasaki

A production equipment line for a hot-rolled steel strip comprises a rough rolling mill comprising rough rolling mills for hot rolling a material, which is heated to a predetermined temperature to a finish rolling start sheet thickness and a finish rolling mill comprising finish rolling mills for controlled-rolling the material to a final sheet thickness. At least one of the rough rolling mills is a reversible rolling mill. The production equipment line is provided on an upstream side of the reversible rolling mill with one of a slow cooling apparatus for slowly cooling at a water volume density of less than 1000 L/min&#xb7;mand a rapid cooling apparatus for rapidly cooling after the slow-cooling at a water volume density of not less than 1000 L/min&#xb7;mand the other of the slow cooling apparatus and rapid cooling apparatus on a downstream side of the reversible rolling mill.

Production equipment line for hot-rolled steel strip and production method for hot-rolled steel strip

A production equipment line for a hot-rolled steel strip comprises a rough rolling mill group comprised of plural rough rolling mills for hot rolling a material which is heated up to a predetermined temperature to a finish rolling start sheet thickness and a finish rolling mill group comprised of plural finish rolling mills for controlled-rolling the material to a final sheet thickness, wherein at least one of the plural rough rolling mills is a reversible rolling mill. The production equipment line for a hot-rolled steel strip is provided with a slow cooling apparatus for slowly cooling the material at a water volume density of less than 1000 L/min&#xb7;mand a rapid cooling apparatus which is arranged next to the slow cooling apparatus and rapidly cools the material after the slow-cooling at a water volume density of not less than 1000 L/min&#xb7;m.

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Tokyo, Japan

Yukako Katayama