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2. 发明申请

US20150196954A1 METHOD FOR USING UPPER NOZZLE 有权
标题翻译：使用上喷嘴的方法
公开(公告)号：US20150196954A1
公开(公告)日：2015-07-16
申请号：US14414208
申请日：2012-12-12
申请人： KROSAKIHARIMA CORPORATION
发明人： Arito Mizobe , Kento Furukawa , Tetsuo Tsuduki , Masaki Yamamoto , Joji Kurisu
IPC分类号： B22D41/50 , B22D41/08
CPC分类号： B22D41/50 , B22D41/08 , B22D41/58
摘要： With a view to adding, to an upper nozzle formed with a bore having a shape capable of creating a less energy loss or smooth (constant) molten steel flow to suppress the occurrence of adhesion of inclusions and metals in molten steel, a gas injection function to thereby further suppress the occurrence of the adhesion, the present invention provides a method of using an upper nozzle configured to have a cross-sectional shape of a wall surface defining the bore, taken along an axis of the bore, comprising a curve represented by the following formula: log(r (z))=(1/n)×log((H+L)/(H+z))+log(r (L)) (n=1.5 to 6), where: L is a length of the upper nozzle; H is a calculational hydrostatic head height; and r (z) is an inner radius of the bore at a position downwardly away from an upper edge of the bore by a distance z. The method comprises using the upper nozzle in such a manner as to satisfy the following relationship: RG≦4.3×VL, where RG is a gas rate defined as a volume ratio of a flow rate QG (Nl/s) of injection gas to a flow rate QL (l/s) of molten steel flowing through the bore (RG=(QG/QL)×100(%)), and VL is a flow speed of the molten steel at a lower edge of the upper nozzle.
摘要翻译：为了向形成有具有能够产生较少能量损失或平滑（恒定）钢水流的形状的孔的上部喷嘴添加，以抑制钢水中夹杂物和金属粘附的发生，气体注入功能从而进一步抑制粘附的发生，本发明提供了一种使用上部喷嘴的方法，所述上部喷嘴被构造成具有沿孔的轴线截取的限定孔的壁表面的横截面形状，包括由 log（r（z））=（1 / n）×log（（H + L）/（H + z））+ log（r（L））（n = 1.5〜6） L是上喷嘴的长度; H是计算静压头高度; 并且r（z）是在距离孔的上边缘向下远离距离z的位置处的孔的内半径。该方法包括以满足以下关系式的方式使用上喷嘴：RG＆nlE; 4.3×VL，其中RG是气体速率，其定义为喷射气体的流量QG（Nl / s）的体积比流过孔的钢水的流量QL（l / s）（RG =（QG / QL）×100（％）），VL是上喷嘴下边缘的钢水的流速。

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