Nippon Steel Corporation

Takehiro Nakamoto

Kenji Yamada

Atsushi Ishii

Tatsuo Yokoi

Shigeru Ogawa

Natsuko Sugiura

Teruki Hayashida

Takaaki Nakamura

Hiroshi Omi

The present invention provides a high-strength thin steel sheet drawable and excellent in a shape fixation property and a method of producing the same. For the steel sheet, on a plane at the center of the thickness of a steel sheet, the average ratio of the X-ray strength in the orientation component group of {100}&#x3c;011&#x3e; to {223}&#x3c;110&#x3e; to random X-ray diffraction strength is 2 or more and the average ratio of the X-ray strength in three orientation components of {554}&#x3c;225&#x3e;, {111}&#x3c;112&#x3e; and {111}&#x3c;110&#x3e; to random X-ray diffraction strength is 4 or less. The arithmetic average of the roughness Ra of at least one of the surfaces is 1 to 3.5 &#x3bc;m; the surfaces of the steel sheet are covered with a composition having a lubricating effect; and the friction coefficient of the steel sheet surfaces at 0 to 200&#xb0; C. is 0.05 to 0.2. Further, the present invention also relates to a method of producing said steel sheet, characterized by: rolling a steel sheet having the chemical components specified in the present invention at a total reduction ratio of 25% or more in the temperature range of the Artransformation temperature +100&#xb0; C. or lower.

High-strength thin steel sheet drawable and excellent in shape fixation property and method of producing the same

Control method of strip travel and tandem strip rolling mill

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Oita, Japan

Takehiro Nakamoto