Nippon Steel Corporation

Shintaro Oga

Nobuhiro Okada

Yuichi Tsukaguchi

Toshiaki Mizoguchi

Jun Takekawa

Hidenori Kurimoto

A method for producing steel includes: (a) a step of adding the first group of alloys to molten steel having an amount of dissolved oxygen of 0.0050 mass % or more; (b) a step of, after the step of (a), adding deoxidizer to the molten steel for deoxidation; (c) a step of, after the step of (b), adding the second group of alloys to the deoxidized molten steel; and (d) a step of, after the step of (c), adding REM to the molten steel, wherein amounts of oxygen Ointroduced from the first group of alloys (mass %) and amounts of oxygen Ointroduced from the second group of alloys (mass %) satisfy [O≤0.00100], [O+O≥0.00150], and [O/O≥2.0], and satisfy a formula [0.05≤REM/T.O≤0.5] after the step of (d).

Method for producing steel

This mold equipment is mold equipment provided with a mold, an electromagnetic brake device, and a control device. An immersion nozzle is provided with a pair of discharge holes of molten metal, the electromagnetic brake device is provided with an iron core including a pair of teeth and coils wound around the respective teeth, the coils on one side are connected in series in a first circuit, the coils on the other side are connected in series in a second circuit, and the control device is able to independently control voltage and current applied to each of the first and second circuits for each circuit, detects a drift of a discharge flow between the pair of discharge holes on the basis of the voltage applied to the coils in the first circuit and the voltage applied to the coils in the second circuit, and controls the current flowing through the first circuit and the current flowing through the second circuit on the basis of a detection result.

Mold equipment and continuous casting method

A molding facility in continuous casting enabling the quality of the cast slab to be achieved stably even if improving the productivity, the molding facility provided with a mold for continuous casting use, a first water box and second water box storing cooling water for cooling the mold, an electromagnetic stirring device imparting to molten metal in the mold an electromagnetic force causing a swirling flow to be generated in a horizontal plane, and an electromagnetic brake device imparting to a discharge flow of molten metal to an inside of the mold from a submerged nozzle an electromagnetic force in a direction braking the discharge flow, the first water box, the electromagnetic stirring device, the electromagnetic brake device, and the second water box being placed in that order from above to below at an outside surface of a long side mold plate of the mold so as to fit between a top end and bottom end of the long side mold plate, a core height Hof the electromagnetic stirring device and a core height Hof the electromagnetic brake device satisfying 0.80&#x2264;H/H&#x2264;2.33.

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Tokyo, Japan

Shintaro Oga