Jfe Steel Corporation

Shinichiro Aoe

Masaki Kobayashi

Jun Eto

Masaru Miyake

Hiromasa Hayashi

Daijiro Yuasa

Masaji Tomiyama

Provided are a steel-shape measurement device and a steel-shape correction device. The steel-shape measurement device measures a distance to a detection spot group on a to-be-scanned surface of a steel product with a laser rangefinderA that measures the distance through scanning of a steel product S with a laser beam emitted from one laser light sourceand redirected with a galvanometer mirrorand measures a shape of the steel product from obtained measured-distance data. The steel-shape measurement device includes an object having a 45&#xb0;-0&#xb0; diffuse reflectance of equal to or lower than 10% as a laser-beam absorberat least one portion within an irradiation range irradiated with a regular-reflected laser beam from a to-be-scanned surface of the steel product.

Steel-products shape measurement device and steel-products shape correction device

The present invention relates to a production method for a hot rolled strip in a hot rolling line. An object of the present invention is to ensure stable running of a hot rolled strip on a hot runout table, and to prevent excessive displacement of the hot rolled strip above a pass line, and, for example, a head folding defect and a tail folding defect resulting from the displacement. In the method of the present invention, a fluid jet is squirted above a hot rolled strip conveyed by a hot runout table so as to pass over the hot rolled strip running without touching a surface of the hot rolled strip running on a pass line (a strip-conveying surface of the hot runout table). A strip portion displaced upward from the pass line beyond a predetermined level collides with the fluid jet, and the displacement of the strip portion is thereby corrected. Since the fluid jet passes over the normally running hot rolled strip without touching therewith, the strip portion is properly prevented from being displaced by squirting the fluid jet.

Process for producing hot-rolled steel strip and apparatus therefor

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Tokyo, Japan

Shinichiro Aoe