CONTINUOUS CASTING METHOD AND LADLE INJECTION NOZZLE

To provide a continuous casting method, when a molten steel is injected from a ladle into a tundish, which can securely float and separate minute inclusions in the molten steel in the tundish.SOLUTION: There is provided a continuous casting method in which a molten steel M in a ladle 1 is injected i...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: HARADA HIROSHI, FUJI TAKEHIKO, NAGASHIMA MASAKI, IMAWAKA HIROSHI, OKADA NOBUHIRO, MINETA AKIRA, KATAOKA ATSUICHIRO
Format: Patent
Sprache:eng ; jpn
Schlagworte:
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:To provide a continuous casting method, when a molten steel is injected from a ladle into a tundish, which can securely float and separate minute inclusions in the molten steel in the tundish.SOLUTION: There is provided a continuous casting method in which a molten steel M in a ladle 1 is injected into a tundish 20 via an injection nozzle 10 provided at a bottom face side of the ladle 1. As the injection nozzle 10, a bottomed nozzle is used which has a discharge port 14 at a nozzle side part and has a bottom part 15 opposed to a bottom face of the tundish 20 at a nozzle lower part, a gas space G of an inert gas is provided around an injection flow of the molten steel in the injection nozzle 10, the inert gas in the gas space G is entrained when the injection flow of the molten steel M is collided with a meniscus face of the molten steel in the injection nozzle 10 to generate bubbles of the inert gas in the molten steel, and the molten steel is stirred in the injection nozzle 10 to discharge the molten steel from the discharge port 14 into the tundish 20.SELECTED DRAWING: Figure 1 【課題】取鍋からタンディッシュに溶鋼を注入する際に、溶鋼内の微小な介在物をタンディッシュ内において確実に浮上分離させることを可能とする、連続鋳造方法を提供する。【解決手段】取鍋1の底面側に設けた注入ノズル10を介して、取鍋1内の溶鋼Mをタンディッシュ20内に注入する連続鋳造方法であり、注入ノズル10として、ノズル側部に吐出口14を有し、かつノズル下部にタンディッシュ20の底面に対向する底部15を有する、有底ノズルを用い、注入ノズル10内における溶鋼の注入流の周囲に不活性ガスのガス空間Gを設けておき、溶鋼Mの注入流を注入ノズル10内の溶鋼のメニスカス面に衝突させた際にガス空間G内の不活性ガスを巻き込ませて溶鋼中に不活性ガスの気泡を生成させ、更に、注入ノズル10内において溶鋼を撹拌させて、吐出口14からタンディッシュ20内に溶鋼を吐出させる、連続鋳造方法を採用する。【選択図】図1