公开(公告)号：US4898226A

公开(公告)日：1990-02-06

申请号：US199018

申请日：1988-05-26

申请人： Toshio Teshima ,  Tooru Kitagawa ,  Mikio Suzuki ,  Toshi Masaoka ,  Takashi Mori ,  Kazutaka Okimoto

发明人： Toshio Teshima ,  Tooru Kitagawa ,  Mikio Suzuki ,  Toshi Masaoka ,  Takashi Mori ,  Kazutaka Okimoto

IPC分类号： B22D41/58

CPC分类号： B22D41/58

摘要： An immersion nozzle for continuous casting of molten steel comprises: an immersion nozzle body having a bore for introducing molten steel supplied from a tundish into a continuous casting mold; two exit ports located symmetrically about the vertical center axis of the immersion nozzle body at a lower portion of the immersion nozzle body for introducing the molten steel into the continuous casting mold; gas blow-in inlets in an inwall of the immersion nozzle body, the center axis line of the blow-in inlets crossing, at right angle, a vertical plane passing through a line connecting the respective centers of the exit ports; and gas blow conduits, each being connected respectively to one of the gas blow-in inlets. The gas blow-in inlets have a height almost equal to a vertical length across the exit ports, the top of the gas blow-in inlets being from 0 to 100 mm above the upper end of the exit ports.

公开(公告)号：US4852633A

公开(公告)日：1989-08-01

申请号：US199113

申请日：1988-05-26

申请人： Toshio Teshima ,  Tooru Kitagawa ,  Mikio Suzuki ,  Toshio Masaoka ,  Takashi Mori ,  Kazutaka Okimoto

发明人： Toshio Teshima ,  Tooru Kitagawa ,  Mikio Suzuki ,  Toshio Masaoka ,  Takashi Mori ,  Kazutaka Okimoto

IPC分类号： B22D11/10 ,  B22D41/50

CPC分类号： B22D41/50

摘要： An immersion nozzle for continuous casting of steel comprises an immersion nozzle body for introducing molten steel supplied form a tundish into a continuous casting mold, the immersion nozzle body having two exit ports located symmetrically about a vertical center axis of the immersion nozzle body at a lower portion thereof and being immersed in the molten steel in the mold. The immersion nozzle body has a bore which includes first and second sectional areas, the first sectional area being at and below the two exit ports and being smaller than the second sectional area, the second sectional area being above the two exit ports, and the molten steel passing through the bore and out through the two exit ports. The bore has an inner diameter at the level of the two exit ports which is substantially equal to a horizontal inner length or diameter of the two exit ports. A ratio represented by (A)/(B) is from 0.5 to 0.8, where (A) is the area of the first sectional area and (B) is the area of the second sectional area.

公开(公告)号：US5307863A

公开(公告)日：1994-05-03

申请号：US113958

申请日：1993-08-30

申请人： Jun Kubota ,  Akira Shirayama ,  Toshio Masaoka ,  Kazutaka Okimoto ,  Takashi Mori

发明人： Jun Kubota ,  Akira Shirayama ,  Toshio Masaoka ,  Kazutaka Okimoto ,  Takashi Mori

IPC分类号： B22D11/115 ,  B22D11/12 ,  B22D11/18 ,  B22D27/02

CPC分类号： B22D11/115 ,  B22D11/122 ,  B22D11/186

摘要： A method for continuous casting of a slab comprises feeding molten steel into a mold through exit ports of an immersion nozzle and controlling a stream of the molten steel by means of an electromagnetic stirrer having a linearly shifting magnetic field. The direction of the linearly shifting magnetic field is toward the immersion nozzle, which is positioned at the center of the mold from a pair of narrow sides of the mold. A first frequency control step controls a frequency of a wave of the shifting magnetic field to be higher than a threshold frequency, wherein the wave has a period equal to the time during which the stream of the molten steel poured from the immersion nozzle passes through an area to which the linearly shifting magnetic field is introduced, said area having an upper limit and a lower limit. A second control step controls the frequency of the wave of the linearly shifting magnetic field to be low enough such that the magnetic fluxes of the linearly shifting magnetic field are of a density high enough to apply a braking force to the molten steel.

摘要翻译： 连续铸造板坯的方法包括通过浸入式喷嘴的出口将钢水送入模具，并通过具有线性移动磁场的电磁搅拌器控制钢水流。 线性移动磁场的方向是朝向从模具的一对窄边位于模具中心的浸入式喷嘴。 第一频率控制步骤将移动磁场的波的频率控制为高于阈值频率，其中波具有等于从浸没喷嘴注入的钢水流过的时间段 引入线性移位磁场的区域，所述区域具有上限和下限。 第二控制步骤将线性移动磁场的波的频率控制得足够低，使得线性移位磁场的磁通量具有足够高的密度以对钢水施加制动力。