Kawasaki Steel Corporation

Jfe Steel Corporation

Kyoritsu Gokin Co., Ltd.

Kazunari Andachi

Kenta Karube

Hiroshi Nomura

Kiyoshi Takahashi

Daisuke Takahashi

Takashi Nishiyama

Masahiro Furukawa

Nobutaka Goto

Mamoru Suda

Ichiro Sugimoto

Ryoji Nagai

Harumi Shigemoto

Akihiko Tanigaki

Kazuaki Hara

A nozzle orifice of a nozzle () includes a tapered segment () extending from an elliptical discharge orifice () and having a taper angle &#x3b8; of 30 to 80&#xb0;, and a large-diameter segment () continuing with the tapered segment. The ratio of the inner diameter of large-diameter segment () relative to the minor diameter of the discharge orifice () is not less than 3 and less than 7. Also, the discharge how from the nozzle spreads in a single direction (width direction) within a plane perpendicular to the central axis of the nozzle and the erosion thickness angle is 1.5 to 3&#xb0; in the direction (thickness direction), perpendicular to the width direction. Such a descaling nozzle enables that scale is removed efficiently at low pressure and/or low flow rate while restraining the cooling of a steel plate.

Descaling nozzle

A method of controlling a furnace pressure for preventing air from intruding to a heating furnace, a method of stable operation during low combustion load of heat regenerating burners and a method of measuring concentration of an atmospheric gas in a heating furnace are proposed.

Heating furnace having heat regenerating burners and operation method thereof

A ladle after teeming for a continuous casting and a subsequent slag discharge is mounted on a ladle truck and then moved by the ladle truck to a tapping station. The ladle on the ladle truck is then stationed over a predetermined stand-by time and is then immediately moved to a tapping position to receive a molten steel from a converter. The ladle is quickly heated during the stand-by time, by a regenerative-type burner system carried by a ladle lid which is attached to the ladle to cover the top opening of the ladle. This allows the tapping temperature of the molten steel to be set to a low level, offering advantages such as a remarkable reduction in the consumption of carbonaceous materials as the temperature controller, as well as extended life of ladle refractories through suppression of thermal attack. At the same time, consumption of fuel gas for heating the ladle by the burner system is reduced to contribute to saving of energy.

Ladle, a ladle heating system and methods of heating the ladle

Method for adjusting coating weight by gas wiping

Growing community of inventors

Kurashiki, Japan

Kazunari Andachi