Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Tetsuo Kishimoto

Kunio Hayashi

Riki Okamoto

Nobuhiro Fujita

Manabu Takahashi

Shigeru Ogawa

Yoshihiro Serizawa

Noriyuki Hishinuma

Hiroshi Yoshida

Yasuhiro Nishiyama

Isao Yoshii

Yoji Nakamura

Hitoshi Nikaidoh

Shinji Ida

Nobuhiro Takagi

Takeshi Yamamoto

Kazuaki Nakano

Tooru Akashi

Naoki Kataoka

Tatsuya Nakada

Toshiaki Saitoh

Satoru Mashiko

Akihisa Tsuruta

An edging method including changing an incident angle of a slab with respect to a pair of edging members that are disposed on a conveyance line of the slab and that edge the slab based on information relating to the slab acquired at at least one of prior to edging or after edging.

Edging method and edging device

A hot-rolled steel sheet has an average value of the X-ray random intensity ratio of a {100} &#x3c;011&#x3e; to {223} &#x3c;110&#x3e; orientation group at least in a sheet thickness central portion that is in a sheet thickness range of &#x215d; to &#x215c; from a steel sheet surface of 1.0 to 6.0, an X-ray random intensity ratio of a {332} &#x3c;113&#x3e; crystal orientation of 1.0 to 5.0, rC which is an r value in a direction perpendicular to a rolling direction of 0.70 to 1.10, and r30 which is an r value in a direction that forms an angle of 30&#xb0; with respect to the rolling direction of 0.70 to 1.10.

Hot-rolled steel sheet, cold-rolled steel sheet, galvanized steel sheet, and methods of manufacturing the same

In a hot-rolled sheet, an average value of pole densities of an orientation group {100}&#x3c;011&#x3e; to {223}&#x3c;110&#x3e;, which is represented by an arithmetic mean of pole densities of orientations {100}&#x3c;011&#x3e;, {116}&#x3c;110&#x3e;, {114}&#x3c;110&#x3e;, {112}&#x3c;110&#x3e;, and {223}&#x3c;110&#x3e; in a thickness center portion of a thickness range of &#x215d; to &#x215c; from a surface of the steel sheet, is 1.0 to 6.5 and a pole density of a crystal orientation {332}&#x3c;113&#x3e; is 1.0 to 5.0; and a Lankford value rC in a direction perpendicular to a rolling direction is 0.70 to 1.10 and a Lankford value r30 in a direction that forms 30&#xb0; with respect to the rolling direction is 0.70 to 1.10.

Method of producing a hot rolled steel sheet

A cooling apparatus for hot rolling is installed on a downstream side of a finishing mill of a continuous hot rolling mill, and cools a steel sheet rolled by the finishing mill while being conveyed. The cooling apparatus includes first pinch rolls which, during an interval when the steel sheet fed out from a final stand of the finishing mill moves from a position of the final stand to a position where a surface temperature of the steel sheet reaches 850&#xb0; C. or less, pinch the steel sheet while applying tension of 3.9 MPa or greater.

Cooling apparatus and cooling method for hot rolling

The present invention provides a method of cooling a hot-rolled steel strip which has passed through a finishing rolling, including: cooling the hot-rolled steel strip from a first temperature of not lower than 600&#xb0; C. and not higher than 650&#xb0; C. to a second temperature of not higher than 450&#xb0; C. with cooling water having the water amount density of not lower than 4 m/m/min and not higher than 10 m/m/min, wherein with respect to the area of the target surface, the area of a portion where a plurality of spray jets of the cooling water directly strikes on the target surface is at least 80%.

Cooling device of hot-rolled steel strip

Cooling method of hot-rolled steel strip

Growing community of inventors

Tokyo, Japan

Tetsuo Kishimoto