发明申请
- 专利标题: METHOD FOR USING UPPER NOZZLE
- 专利标题(中): 使用上喷嘴的方法
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申请号: US14414208申请日: 2012-12-12
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公开(公告)号: US20150196954A1公开(公告)日: 2015-07-16
- 发明人: Arito Mizobe , Kento Furukawa , Tetsuo Tsuduki , Masaki Yamamoto , Joji Kurisu
- 申请人: KROSAKIHARIMA CORPORATION
- 申请人地址: JP Fukuoka
- 专利权人: KROSAKIHARIMA CORPORATION
- 当前专利权人: KROSAKIHARIMA CORPORATION
- 当前专利权人地址: JP Fukuoka
- 优先权: JP2012-157860 20120713; JP2012-224458 20121009
- 国际申请: PCT/JP2012/082181 WO 20121212
- 主分类号: B22D41/50
- IPC分类号: B22D41/50 ; B22D41/08
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.
公开/授权文献
- US09718128B2 Method for using upper nozzle 公开/授权日:2017-08-01