Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Nippon Steel & Sumikin Engineering Co., Ltd.

Ns Plant Designing Corporation

Shuntaro Imai

Hiroaki Uchiyama

Yasuo Maruki

Ryousuke Takata

Daisuke Miki

Hideaki Sakurai

Daisuke Sakai

Toshiaki Mizoguchi

Norimasa Yamasaki

Shinji Nagai

Masanobu Hayama

Yukihiro Matsuoka

Satoshi Senoo

Mitsutoshi Jotoku

Mitsutaka Hattori

Provided is a slab warpage detection apparatus detecting warpage of a slab drawn from a mold in continuous casting equipment. The slab warpage detection apparatus includes a pair of pressing roils that pinches the slab on a rear side of a roll segment, supporting the slab drawn from the mold, in a slab drawing direction, a movement unit that supports the pair of pressing rolls to be movable in a thickness direction of the slab, and a position detecting unit that detects positions of the pressing rolls in the thickness direction of the slab.

Slab warpage detection apparatus and method of detecting warpage of slab

A continuous-cast slab is provided where central porosity is reduced by surly crushing the slab. A method and apparatus of manufacturing the slab is also provided. The continuous-cast slab having horizontally symmetrical granular equiaxed crystals at least in the center in the thickness direction includes a first reduction dent and a second reduction dent that further dents from the bottom surface of the first reduction dent and is narrower than the first reduction dent at least on one long side surface. Such a configuration can makes it possible to achieve the continuous-cast slab of no more than 2.5&#xd7;10cm/g in a maximum porosity volume while segregation is reduced.

Continuous-cast slab, method and apparatus of manufacturing the same, and method and apparatus of manufacturing thick steel plate

The present invention is a casting product reduction apparatus that applies reduction to a casting product drawn from a mold with a sufficient reduction force and thereby can surely decrease center segregation and porosity and suppress occurrence of internal cracks so as to manufacture a high-quality casting product and includes: a pair of casting product press rolls that hold and press the casting product therebetween; backup rolls that support the casting product press rolls; and a pair of frames arranged to face each other, wherein three or more sets of the casting product press roll and the backup roll are arranged in a casting product drawing direction on each of the frames, and wherein a reduction means that decreases and increases a distance between the frames is provided at two or more places on the pair of frames.

Casting product reduction apparatus

Continuous casting equipment includes a casting product reduction apparatus and a casting product drawing apparatus, the casting product reduction apparatus including a pair of casting product reduction rolls that sandwich and apply pressure to a casting product and being configured to apply reduction to the casting product, the casting product drawing apparatus being provided in a following stage of the casting product reduction apparatus and configured to sandwich and draw the casting product with a pair of casting product drawing rolls. At least one of the pair of casting product reduction rolls includes a large-diameter part that projects radially outward in an axial-direction center region and applies pressure to a width-direction center region of the casting product. The casting product that is subjected to reduction by the casting product reduction apparatus has a depressed part corresponding to the large-diameter part. At least one of the pair of casting product drawing rolls of the casting product drawing apparatus includes a depressed part supporting part that contacts with and supports the depressed part, and is driven by a driving mechanism. An axial-direction length Lof the depressed part supporting part and an axial-direction length Lof the large-diameter part of the casting product reduction roll satisfy 0.5&#xd7;L&#x2266;L&#x3c;L.

Continuous casting equipment

Growing community of inventors

Tokyo, Japan

Shuntaro Imai