公开(公告)号：EP0707909A4

公开(公告)日：1997-10-29

申请号：EP94910564

申请日：1994-03-29

申请人： NIPPON STEEL CORP

发明人： HARADA HIROSHI ,  TAKEUCHI EIICHI ,  TOH TAKEHIKO ,  ISHII TAKANOBU

IPC分类号： B22D11/11 ,  B22D11/115 ,  B22D11/10 ,  B22D11/18

CPC分类号： B22D11/115

摘要： This invention relates to a method of controlling a flow in a casting mold in a DC magnetic field, in which the casting of steel is done continuously as a flow of molten steel discharged from a nozzle is controlled by applying a DC magnetic field having substantially uniform magnetic flux density distribution in the entire widthwise direction of a casting mold to the casting mold in the direction of the thickness thereof, characterized in that the meniscus velocity of flow on the surface of the molten steel in the casting mold is controlled within a range of 0.20 - 0.40 m/sec by regulating an ejection angle of the nozzle, position of the magnetic field and a magnetic flux density. When the meniscus velocity of flow is increased greatly, a control operation is carried out in accordance with the following equation (1): Vp/Vo = 1 + alpha 1{1-exp(- beta 1.H )} by dashing an ejection flow from the nozzle directly against a shorter wall of the casting mold, and, when the meniscus velocity of flow is increased or reduced, a control operation is carried out in accordance with the following equation (2): Vp/Vo = 1 + alpha 2{sin( beta 2.H)exp(- gamma .H)} by dashing an ejection flow from the nozzle against a shorter wall of the casting mold after passing it through a magnetic field zone. In equations (1) and (2) H = 185.8.B .D.T/(D+T)V.

摘要翻译： 本发明涉及一种在直流磁场中控制铸模中的流动的方法，其中钢的铸造是通过施加基本上均匀的直流磁场来控制的，因为从喷嘴排出的钢水流被控制 在铸模的厚度方向上铸模的整个横向方向上的磁通密度分布，其特征在于，铸模中钢水表面上的弯液面速度被控制在 通过调节喷嘴的喷射角度，磁场位置和磁通密度来确定0.20-0.40m / sec。 当流量的弯液面速度大大增加时，根据以下等式（1）进行控制操作：Vp / Vo = 1 +α1a1-exp（-β1H2）ü通过冲击 喷嘴直接喷射到铸模的较短壁上，当流动的弯液面速度增加或减小时，根据下列等式（2）执行控制操作：Vp / Vo = 1 + 通过在通过磁场区域之后将来自喷嘴的喷射流喷射到铸模的较短壁上，从而将α2α（β.H）exp（-γ.H）ü。 在等式（1）和（2）中，H = 185.8B <2> .D.T /（D + T）V。