Patents by Inventor Masahito Hanao
Masahito Hanao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11453048Abstract: 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 %.Type: GrantFiled: November 7, 2016Date of Patent: September 27, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Masahito Hanao, Daiki Naito
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Patent number: 10512970Abstract: 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 ? ? ? ) ? , ? and ? ? B max = 3000 · ( D max D 0 ) 3 · ( H SEN H 0 ) ( v · sin ? ? ? ) 2 .Type: GrantFiled: January 24, 2019Date of Patent: December 24, 2019Assignee: NIPPON STEEL CORPORATIONInventors: Masahito Hanao, Hiroaki Uchiyama, Kohei Fujimoto, Masatoshi Miyahara
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Patent number: 10328488Abstract: 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.Type: GrantFiled: June 2, 2015Date of Patent: June 25, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masahito Hanao, Masaki Nagashima, Masatsugu Ishibashi
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Patent number: 10315245Abstract: 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.Type: GrantFiled: September 11, 2014Date of Patent: June 11, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventor: Masahito Hanao
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Publication number: 20190151937Abstract: 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 ? ? ? ) ? , ? and ? ? B max = 3000 · ( D max D 0 ) 3 · ( H SEN H 0 ) ( v · sin ? ? ? ) 2 .Type: ApplicationFiled: January 24, 2019Publication date: May 23, 2019Inventors: Masahito HANAO, Hiroaki UCHIYAMA, Kohei FUJIMOTO, Masatoshi MIYAHARA
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Patent number: 10259037Abstract: 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 ? ? ? ) , and ? ? B max = 3000 · ( D max D 0 ) 3 · ( H SEN H 0 ) ( v · sin ? ? ? ) 2 .Type: GrantFiled: March 31, 2016Date of Patent: April 16, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masahito Hanao, Hiroaki Uchiyama, Kohei Fujimoto, Masatoshi Miyahara
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Publication number: 20190060985Abstract: 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 %.Type: ApplicationFiled: November 7, 2016Publication date: February 28, 2019Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masahito HANAO, Daiki NAITO
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Publication number: 20180009026Abstract: 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 ? ? ? ) , and ? ? B max = 3000 · ( D max D 0 ) 3 · ( H SEN H 0 ) ( v · sin ? ? ? ) 2 .Type: ApplicationFiled: March 31, 2016Publication date: January 11, 2018Inventors: Masahito HANAO, Hiroaki UCHIYAMA, Kohei FUJIMOTO, Masatoshi MIYAHARA
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Publication number: 20170266718Abstract: 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.Type: ApplicationFiled: September 11, 2014Publication date: September 21, 2017Inventor: Masahito HANAO
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Publication number: 20170087624Abstract: 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.Type: ApplicationFiled: June 2, 2015Publication date: March 30, 2017Inventors: Masahito HANAO, Masaki NAGASHIMA, Masatsugu ISHIBASHI
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Patent number: 8397792Abstract: In a mold for continuously casting a round billet with a curved type continuous casting apparatus, assuming that D0 (m) is an inner diameter at a lower mold edge and R0 (m) is a curvature radius of an outer curvature side at the lower mold edge, when a rate of change Tp (%/m) in mold inner diameter per unit length along a casting direction is expressed by Formula 1, and when a rate of change Rp (%/m) in curvature radius of an outer curvature side per unit length along the casting direction is expressed by Formula 2, the rate of change Tp in mold inner diameter and the rate of change Rp in curvature radius satisfy a relationship expressed by Formula 3; Tp=(1/D0)×(dD/dx)×100(%/m)??Formula 1 Rp=(1/R0)×(dR/dx)×100(%/m)??Formula 2 where D in Formula 1 is a mold inner diameter at a distance x away from an upper mold edge and R in Formula 2 is a curvature radius of the outer curvature side at the distance x, Rp=(Tp/2)×(D0/R0)??Formula 3 Uniform and good contact is obtained between the billet and a mold inner peType: GrantFiled: June 21, 2012Date of Patent: March 19, 2013Assignee: Sumitomo Metal Industries, Ltd.Inventors: Masayuki Kawamoto, Yuichi Tsukaguchi, Masahito Hanao, Atsushi Hirata, Hiroshi Hayashi, Manabu Adachi
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Publication number: 20120255700Abstract: In a mold for casting a billet with a curved type continuous casting apparatus, D0 (m) is an inner diameter at a lower mold edge and R0 (m) is a curvature radius of an outer curvature side at the lower mold edge. When a rate of change Tp (%/m) in mold inner diameter per unit length along a casting direction is Tp=(1/D0)×(dD/dx)×100 (%/m), and when a rate of change Rp (%/m) in curvature radius of an outer curvature side per unit length along the casting direction is Rp=(1/R0)×(dR/dx)×100 (%/m), the rate of change Tp in mold inner diameter and the rate of change Rp in curvature radius satisfy a relationship expressed Rp=(Tp/2)×(D0/R0), where D is a mold inner diameter at a distance x away from an upper mold edge and R in Formula 2 is a curvature radius of the outer curvature side at the distance x.Type: ApplicationFiled: June 21, 2012Publication date: October 11, 2012Applicant: SUMITOMO METAL INDUSTRIES, LTD.Inventors: Masayuki KAWAMOTO, Yuichi TSUKAGUCHI, Masahito HANAO, Atsuhi HIRATA, Hiroshi HAYASHI, Manabu ADACHI
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Patent number: 8225843Abstract: In a mold for casting a billet with a curved type continuous casting apparatus, D0 (m) is an inner diameter at a lower mold edge and R0 (m) is a curvature radius of an outer curvature side at the lower mold edge. When a rate of change Tp (%/m) in mold inner diameter per unit length along a casting direction is Tp=(1/D0)×(dD/dx)×100 (%/m), and when a rate of change Rp (%/m) in curvature radius of an outer curvature side per unit length along the casting direction is Rp=(1/R0)×(dR/dx)×100 (%/m), the rate of change Tp in mold inner diameter and the rate of change Rp in curvature radius satisfy a relationship expressed Rp=(Tp/2)×(D0/R0), where D is a mold inner diameter at a distance x away from an upper mold edge and R in Formula 2 is a curvature radius of the outer curvature side at the distance x.Type: GrantFiled: October 15, 2009Date of Patent: July 24, 2012Assignee: Sumitomo Metal Industries, Ltd.Inventors: Masayuki Kawamoto, Yuichi Tsukaguchi, Masahito Hanao, Atsushi Hirata, Hiroshi Hayashi, Manabu Adachi
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Patent number: 7913745Abstract: A method for continuously casting a billet with a small cross section in which a curved type or vertical type continuous casting machine is used while oscillating the mold upward and downward is characterized in that the casting machine is provided with a mechanism for withdrawing speed oscillation. The mechanism has structural play in the directions of driving and reverse driving in such a manner that the amount of a play-incurred displacement from the neutral position of the structural play in the direction of billet driving or reverse driving is ±2 to ±30 mm in the direction of driving on the pinch roll circumferential length equivalent basis. The mechanism produces a returning force toward the neutral position and operational parameters such as the billet length, the specific amount of secondary cooling water, the casting speed as well as the oscillation amplitude and frequency are optimized.Type: GrantFiled: October 15, 2009Date of Patent: March 29, 2011Assignee: Sumitomo Metal Industries, Ltd.Inventors: Yuichi Tsukaguchi, Masayuki Kawamoto, Masahito Hanao, Atsushi Hirata, Hiroshi Hayashi, Manabu Adachi
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Patent number: 7909086Abstract: Continuously casting a billet with a small cross section by pouring molten steel into a mold using a cylindrical immersion nozzle is characterized by measuring the molten steel level in the mold using an eddy current sensor. The level is controlled based on the thus-measured value, motion of steel in the mold is adjusted by electromagnetic stirring, a cooling zone during the final period of solidification is disposed within a certain region ranging from the meniscus to the specific site, and casting speed is adjusted so that the region in which the solid phase ratio at the billet center is 0.3-0.99 may be included in the cooling zone during the final period of solidification. The secondary cooling water amount and the billet surface temperature at the entrance to the cooling zone the density of cooling water in the cooling zone during the final period of solidification are optimized.Type: GrantFiled: October 15, 2009Date of Patent: March 22, 2011Assignee: Sumitomo Metal Industries, Ltd.Inventors: Yuichi Tsukaguchi, Masayuki Kawamoto, Masahito Hanao, Atsushi Hirata, Hiroshi Hayashi
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Publication number: 20110005705Abstract: Mold flux for continuously casting steel which contains SiO2, T.CaO, Al2O3 and MgO as main components, one or two or more of alkali metal oxides, and further the constituent F, while the ratio of the T.CaO content to the SiO2 content being from 0.7 to 2.0, the Al2O3 content being 35% or less, the MgO content being 20% or less, the total content of alkali metal oxides being 8% or less, the F content being 7% or less, characterized in that each of the contents expressed by formulae (b) to (e) below satisfies the formula (a): 0.63+2.51×YAl2O3?YCaO/YSiO2?1.23+2.51×YAl2O3 . . . (a), YSiO2=XSiO2/(XSiO2+XCaO+XAl2O3+XMgO) . . . (b), YCaO=XCaO/(XSiO2+XCaO+XAl2O3+XMgO) . . . (c), YAl2O3=XAl2O3/(XSiO2+XCaO+XAl2O3+XMgO) . . . (d), and YMgO=XMgO/(XSiO2+XCaO+XAl2O3+XMgO) . . . (e). Continuous casting of a round billet using this mold flux can effectively prevent the generation of pin-hole defects and longitudinal cracking.Type: ApplicationFiled: November 16, 2009Publication date: January 13, 2011Inventors: Masahito Hanao, Masayuki Kawamoto
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Publication number: 20100032127Abstract: In a mold for casting a billet with a curved type continuous casting apparatus, D0 (m) is an inner diameter at a lower mold edge and R0 (m) is a curvature radius of an outer curvature side at the lower mold edge. When a rate of change Tp (%/m) in mold inner diameter per unit length along a casting direction is Tp=(1/D0)×(dD/dx)×100 (%/m), and when a rate of change Rp (%/m) in curvature radius of an outer curvature side per unit length along the casting direction is Rp=(1/R0)×(dR/dx)×100 (%/m), the rate of change Tp in mold inner diameter and the rate of change Rp in curvature radius satisfy a relationship expressed Rp=(Tp/2)×(D0/R0), where D is a mold inner diameter at a distance x away from an upper mold edge and R in Formula 2 is a curvature radius of the outer curvature side at the distance x.Type: ApplicationFiled: October 15, 2009Publication date: February 11, 2010Inventors: Masayuki Kawamoto, Yuichi Tsukaguchi, Masahito Hanao, Atsushi Hirata, Hiroshi Hayashi, Manabu Adachi
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Publication number: 20100032129Abstract: A method for continuously casting a billet with a small cross section in which a curved type or vertical type continuous casting machine is used while oscillating the mold upward and downward is characterized in that the casting machine is provided with a mechanism for withdrawing speed oscillation. The mechanism has structural play in the directions of driving and reverse driving in such a manner that the amount of a play-incurred displacement from the neutral position of the structural play in the direction of billet driving or reverse driving is ±2 to ±30 mm in the direction of driving on the pinch roll circumferential length equivalent basis. The mechanism produces a returning force toward the neutral position and operational parameters such as the billet length, the specific amount of secondary cooling water, the casting speed as well as the oscillation amplitude and frequency are optimized.Type: ApplicationFiled: October 15, 2009Publication date: February 11, 2010Inventors: Yuichi Tsukaguchi, Masayuki Kawamoto, Masahito Hanao, Atsushi Hirata, Hiroshi Hayashi, Manabu Adachi
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Publication number: 20100025004Abstract: Continuously casting a billet with a small cross section by pouring molten steel into a mold using a cylindrical immersion nozzle is characterized by measuring the molten steel level in the mold using an eddy current sensor. The level is controlled based on the thus-measured value, motion of steel in the mold is adjusted by electromagnetic stirring, a cooling zone during the final period of solidification is disposed within a certain region ranging from the meniscus to the specific site, and casting speed is adjusted so that the region in which the solid phase ratio at the billet center is 0.3-0.99 may be included in the cooling zone during the final period of solidification. The secondary cooling water amount and the billet surface temperature at the entrance to the cooling zone the density of cooling water in the cooling zone during the final period of solidification are optimized.Type: ApplicationFiled: October 15, 2009Publication date: February 4, 2010Inventors: Yuichi Tsukaguchi, Masayuki Kawamoto, Masahito Hanao, Atsushi Hirata, Hiroshi Hayashi
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Patent number: 6386271Abstract: A method of continuous casting of a steel employs a mold power having a viscosity of 0.5-1.5 poise at 1,300° C. and a solidification temperature of 1,190-1,270° C., in which the mass ratio of CaO to SiO2 is 1.2-1.9, and casting is carried out under the following conditions: casting speed is 2.5-10 m/minute; mold oscillation stroke is 4-15 mm; and specific cooling intensity in secondary cooling of a slab is 1.0-5.0 liter/kg-steel.Type: GrantFiled: March 31, 2000Date of Patent: May 14, 2002Assignee: Sumitomo Metal Industries, Ltd.Inventors: Masayuki Kawamoto, Masahito Hanao, Hirohisa Kikuchi, Toshihiko Murakami, Masahiko Oka