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公开(公告)号:US10259037B2
公开(公告)日:2019-04-16
申请号:US15535439
申请日:2016-03-31
IPC分类号: B22D11/115 , B22D11/18 , B22D11/04 , B22D11/11 , B22D11/041
摘要: A primary object of the present invention is to provide a technique of avoiding occurrence of surface defects caused by an electromagnetic brake while checking internal defects with this electromagnetic brake, so that cleanliness of a cast steel can be improved compared with prior arts, and the present invention provides a method for continuously casting steel, the method comprising supplying molten steel into a mold while applying an electromagnetic brake to an outlet flow discharged from an outlet port of an immersion nozzle, wherein magnetic flux density (B) of the electromagnetic brake is within a range of the following (Formula 1): B min ≤ B ≤ B max , B min = 800 · ( D max D 0 ) 3 · ( H SEN H 0 ) ( v · sin θ ) , and B max = 3000 · ( D max D 0 ) 3 · ( H SEN H 0 ) ( v · sin θ ) 2 . ( Formula 1 )
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公开(公告)号:US10512970B2
公开(公告)日:2019-12-24
申请号:US16255904
申请日:2019-01-24
IPC分类号: B22D11/04 , B22D11/041 , B22D11/115 , B22D11/18 , B22D11/11
摘要: A primary object of the present invention is to provide a technique of avoiding occurrence of surface defects caused by an electromagnetic brake while checking internal defects with this electromagnetic brake, so that cleanliness of a cast steel can be improved compared with prior arts, and the present invention provides a method for continuously casting steel, the method comprising supplying molten steel into a funnel mold while applying an electromagnetic brake to an outlet flow discharged from an outlet port of an immersion nozzle, wherein magnetic flux density (B) of the electromagnetic brake is within a range of the following (Formula 1): B min ≤ B ≤ B max , B min = 800 · ( D max D 0 ) 3 · ( H SEN H 0 ) ( v · sin θ ) , and B max = 3000 · ( D max D 0 ) 3 · ( H SEN H 0 ) ( v · sin θ ) 2 . ( Formula 1 )
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公开(公告)号:US10328488B2
公开(公告)日:2019-06-25
申请号:US15311910
申请日:2015-06-02
IPC分类号: B22C3/00 , B22D11/00 , C22C38/00 , C22C38/14 , B22D11/049 , B22D11/108 , B22D11/111 , C22C38/02 , C22C38/04 , C22C38/06
摘要: A mold flux is used in continuous casting of Ti-containing hypo-peritectic steel so as to prevent longitudinal cracks from forming on a surface of a slab. The mold flux contains CaO, SiO2, an alkali metal oxide and a fluorine compound as major components. f(1), f(2) and f(3), which are calculated from the initial chemical composition, are (1.1−0.5×T) to (1.9−0.5×T), 0.05 to 0.40 and 0 to 0.40, respectively, if the Ti content of the molten steel (mass %) is T. The TiO2 content in the melting state during the casting is no more than 20 mass % and the ratio of the first peak height of perovskite to the first peak height of cuspidine in the mold flux film is no more than 1.0.
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公开(公告)号:US11453048B2
公开(公告)日:2022-09-27
申请号:US15770551
申请日:2016-11-07
发明人: Masahito Hanao , Daiki Naito
IPC分类号: B22D11/111 , B22D11/108 , B22D11/00 , C22C38/54 , C22C38/00 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38
摘要: A mold flux for continuous casting has a base material composition containing 25 to 60 mass % of CaO, 15 to 45 mass % of SiO2, 5 to 25 mass % of F, 0.2 to 1.0 mass % of S, and 0 to 20 mass % of a total of Li2O, Na2O, and K2O, and in the base material composition, f(1) is 0.90 to 1.90, f(2) is 0.10 to 0.40, f(3) is 0 to 0.40, and a total of CaO, SiO2, F, S, Li2O, Na2O, and K2O is 90 to 100 mass %.
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公开(公告)号:US10315245B2
公开(公告)日:2019-06-11
申请号:US15509207
申请日:2014-09-11
发明人: Masahito Hanao
IPC分类号: B22D11/00 , C03C10/00 , B22D11/108 , B22D11/111 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , B22D11/049
摘要: Provided is mold flux that can prevent longitudinal cracks from forming on a surface of a slab upon continuous-casting hypo-peritectic steel, wherein CaO, SiO2, an alkali metal oxide and a fluorine compound are contained, 1.1≤(CaO)h/(SiO2)h≤1.9, 0.10≤(CaF2)h/((CaO)h+(SiO2)h+(CaF2)h)≤0.40 and 0≤(alkali metal fluoride)h/((CaO)h+(SiO2)h+(alkali metal fluoride)h)≤0.10 are satisfied, a solidification temperature is no less than 1300° C., and viscosity at 1450° C. is no more than 0.1 Pa·s.
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