Patents by Inventor Norichika Aramaki
Norichika Aramaki 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: 11819909Abstract: The method for manufacturing a high-manganese steel cast slab according to the present invention includes manufacturing a cast slab by continuously casting a molten high-manganese steel having a specific chemical composition. In the manufacture, in a continuous-casting machine or during transportation before subsequent charging into a heating furnace for hot rolling, a processing strain is applied to the cast slab having a surface temperature of 600° C. or higher and 1100° C. or lower in such an amount that a processing strain amount calculated by a certain formula is 3.0% or more and 10.0% or less.Type: GrantFiled: January 22, 2020Date of Patent: November 21, 2023Assignee: JFE STEEL CORPORATIONInventors: Yoichi Ito, Norichika Aramaki, Koichi Nakashima, Shigeki Kitsuya
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Patent number: 11759851Abstract: A method for continuously casting steel capable of reducing center segregation that occurs in a slab. In a section in a continuous casting machine in a slab withdrawal direction, a section from a start point at which the average value of solid phase ratios along a thickness direction at a widthwise center of a slab is within a range of 0.4 or more and 0.8 or less to an end point at which the average value of solid phase ratios along the thickness direction at the widthwise center of the slab is greater than the average value of solid phase ratios at the start point and is 1.0 or less is set as a first section. The slab is cooled by water in the first section at a water flow rate per surface area of the slab within a range of 50 L/(m2×min) or more and 2,000 L/(m2×min) or less.Type: GrantFiled: March 27, 2020Date of Patent: September 19, 2023Assignee: JFE STEEL CORPORATIONInventors: Shuhei Irie, Satoshi Ueoka, Hirokazu Sugihara, Hiroyuki Fukuda, Norichika Aramaki, Akitoshi Matsui, Kenichi Osuka, Sho Kokufu
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Publication number: 20220388057Abstract: A method for manufacturing a continuous casting mold in which cracking and spalling are less likely to occur in a filling laminate. The method includes filling a plurality of concave portions formed on an inner surface of a copper-made mold copper plate or a copper alloy-made mold copper plate used for continuously casting steel at least in a region including a meniscus position of molten steel in a casting process with a metal having a thermal conductivity different from that of the mold copper plate.Type: ApplicationFiled: October 23, 2020Publication date: December 8, 2022Applicant: JFE STEEL CORPORATIONInventors: Tomoya ODAGAKI, Kohei FURUMAI, Norichika ARAMAKI, Kohei ISHIDA, Daiki YANAGIDA
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Patent number: 11471936Abstract: A continuous casting method of steel includes the step of bulging wide side surfaces of a slab having there inside an unsolidified layer with a total intentional bulging amount of 3 to 10 mm by increasing stepwise toward a downstream side in a casting direction a roller gap of a plurality of pairs of slab support rollers disposed in a continuous casting machine.Type: GrantFiled: April 12, 2019Date of Patent: October 18, 2022Assignee: JFE Steel CorporationInventors: Norichika Aramaki, Keigo Toishi, Tomoya Odagaki, Keisuke Sano, Shizuhiko Ikeno
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Publication number: 20220152694Abstract: A method for continuously casting steel capable of reducing center segregation that occurs in a slab. In a section in a continuous casting machine in a slab withdrawal direction, a section from a start point at which the average value of solid phase ratios along a thickness direction at a widthwise center of a slab is within a range of 0.4 or more and 0.8 or less to an end point at which the average value of solid phase ratios along the thickness direction at the widthwise center of the slab is greater than the average value of solid phase ratios at the start point and is 1.0 or less is set as a first section. The slab is cooled by water in the first section at a water flow rate per surface area of the slab within a range of 50 L/(m2×min) or more and 2,000 L/(m2×min) or less.Type: ApplicationFiled: March 27, 2020Publication date: May 19, 2022Applicant: JFE STEEL CORPORATIONInventors: Shuhei IRIE, Satoshi UEOKA, Hirokazu SUGIHARA, Hiroyuki FUKUDA, Norichika ARAMAKI, Akitoshi MATSUI, Kenichi OSUKA, Sho KOKUFU
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Patent number: 11331716Abstract: Continuous casting mold is provided having a mold copper plate having plural separate portions filled with foreign metal formed by filling concave grooves formed on the inner wall surface of the mold copper plate and having a diameter of 2 mm to 20 mm in the inner wall surface at least in the region from a meniscus to a position located 20 mm or more lower than the meniscus with the foreign metal whose thermal conductivity is 80% or less or 125% or more of the mold copper plate, the ratio of the Vickers hardness HVc of the mold copper plate to the Vickers hardness HVm of the filling metal satisfies expression (1), and the ratio of the thermal expansion coefficient ?c of the mold copper plate and the thermal expansion coefficient ?m of the filling metal satisfies expression (2). 0.3?HVc/HVm?2.3??(1), 0.7??c/?m?3.Type: GrantFiled: October 23, 2015Date of Patent: May 17, 2022Assignee: JFE STEEL CORPORATIONInventors: Kohei Furumai, Naomichi Iwata, Norichika Aramaki, Yuji Miki
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Publication number: 20220118508Abstract: The method for manufacturing a high-manganese steel cast slab according to the present invention includes manufacturing a cast slab by continuously casting a molten high-manganese steel having a specific chemical composition. In the manufacture, in a continuous-casting machine or during transportation before subsequent charging into a heating furnace for hot rolling, a processing strain is applied to the cast slab having a surface temperature of 600° C. or higher and 1100° C. or lower in such an amount that a processing strain amount calculated by a certain formula is 3.0% or more and 10.0% or less.Type: ApplicationFiled: January 22, 2020Publication date: April 21, 2022Applicant: JFE Steel CorporationInventors: Yoichi Ito, Norichika Aramaki, Koichi Nakashima, Shigeki Kitsuya
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Patent number: 11077492Abstract: In the continuous steel casting method of the present invention, a gap between strand support rolls with a strand in a rectangular shape interposed therebetween is increased toward a downstream side in a casting direction to thereby bulge the strand having an unsolidified layer thereinside such that the thickness between long-side surfaces of the strand increases within the range of 0.1% or more and 10% or less of the thickness of the strand inside a mold. A portion of the strand in which the solid phase fraction in a central portion of the strand is within the range of 0.2 or more and less than 0.9 satisfies a prescribed total rolling reduction and a prescribed reduction gradient, and a portion of the strand in which the solid phase fraction is within the range of 0.9 or more satisfies a prescribed total rolling reduction and a prescribed reduction gradient.Type: GrantFiled: February 25, 2019Date of Patent: August 3, 2021Assignee: JFE Steel CorporationInventors: Keigo Toishi, Yutaka Awajiya, Norichika Aramaki, Naoki Kikuchi
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Patent number: 11020794Abstract: A continuous casting mold including a water-cooled copper mold having a mold copper plate including an inner wall surface, recessed portions disposed partially or entirely in a region of the inner wall surface of the water-cooled copper mold from at least a position located at a meniscus to a position located 20 mm lower than the meniscus, and material-filled layers disposed in the recessed portions with a metal or nonmetal having a thermal conductivity different from that of the mold copper plate of the water-cooled copper mold. A shape of each of the recessed portions at a surface of the mold copper plate includes a curved surface.Type: GrantFiled: October 16, 2017Date of Patent: June 1, 2021Assignee: JFE STEEL CORPORATIONInventors: Kohei Furumai, Norichika Aramaki, Yuji Miki
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Publication number: 20210138535Abstract: A continuous casting method of steel includes the step of bulging wide side surfaces of a slab having there inside an unsolidified layer with a total intentional bulging amount of 3 to 10 mm by increasing stepwise toward a downstream side in a casting direction a roller gap of a plurality of pairs of slab support rollers disposed in a continuous casting machine.Type: ApplicationFiled: April 12, 2019Publication date: May 13, 2021Inventors: Norichika Aramaki, Keigo Toishi, Tomoya Odagaki, Keisuke Sano, Shizuhiko Ikeno
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Patent number: 10967425Abstract: A continuous steel casting method includes producing a strand. The producing of the strand includes pouring molten steel into a mold of a continuous casting machine and withdrawing a solidified shell from the mold, the solidified shell being a solidified portion of the molten steel. The method includes applying a static magnetic field to at least a portion of a region of the strand, the strand being in the continuous casting machine, the region being a region where a solid fraction fs at a thickness-wise middle position of the strand is in a given range, the static magnetic field having a magnetic field strength of greater than or equal to 0.15 T and being in a direction orthogonal to a direction in which the strand is withdrawn, the static magnetic field being applied at an application time ratio of greater than or equal to 10%.Type: GrantFiled: March 29, 2017Date of Patent: April 6, 2021Assignee: JFE Steel CorporationInventors: Tomoya Odagaki, Norichika Aramaki, Yuji Miki, Naoki Kikuchi
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Publication number: 20200406342Abstract: In the continuous steel casting method of the present invention, a gap between strand support rolls with a strand in a rectangular shape interposed therebetween is increased toward a downstream side in a casting direction to thereby bulge the strand having an unsolidified layer thereinside such that the thickness between long-side surfaces of the strand increases within the range of 0.1% or more and 10% or less of the thickness of the strand inside a mold. A portion of the strand in which the solid phase fraction in a central portion of the strand is within the range of 0.2 or more and less than 0.9 satisfies a prescribed total rolling reduction and a prescribed reduction gradient, and a portion of the strand in which the solid phase fraction is within the range of 0.9 or more satisfies a prescribed total rolling reduction and a prescribed reduction gradient.Type: ApplicationFiled: February 25, 2019Publication date: December 31, 2020Applicant: JFE Steel CorporationInventors: Keigo Toishi, Yutaka Awajiya, Norichika Aramaki, Naoki Kikuchi
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Patent number: 10792729Abstract: A continuous casting mold according to the present invention has plural separate portions filled with a metal of low thermal conductivity formed by filling a metal having a thermal conductivity of 30% or less of that of copper into circular concave grooves having a diameter of 2 to 20 mm which are formed in the region of the inner wall surface of the copper mold from an arbitrary position higher than a meniscus to a position 20 mm or more lower than the meniscus, in which the filling thickness of the metal in the portions filled with the metal of low thermal conductivity is equal to or less than the depth of the circular concave grooves and satisfies the relationship with the diameter of the portions filled with the metal of low thermal conductivity expressed by expression (1) below: 0.5?H?d??(1).Type: GrantFiled: June 11, 2013Date of Patent: October 6, 2020Assignee: JFE STEEL CORPORATIONInventors: Seiji Nabesima, Naomichi Iwata, Norichika Aramaki, Yuji Miki
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Publication number: 20200055113Abstract: A continuous casting mold including a water-cooled copper mold having a mold copper plate including an inner wall surface, recessed portions disposed partially or entirely in a region of the inner wall surface of the water-cooled copper mold from at least a position located at a meniscus to a position located 20 mm lower than the meniscus, and material-filled layers disposed in the recessed portions with a metal or nonmetal having a thermal conductivity different from that of the mold copper plate of the water-cooled copper mold. A shape of each of the recessed portions at a surface of the mold copper plate includes a curved surface.Type: ApplicationFiled: October 16, 2017Publication date: February 20, 2020Applicant: JFE STEEL CORPORATIONInventors: Kohei FURUMAI, Norichika ARAMAKI, Yuji MIKI
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Patent number: 10543527Abstract: Conditions for soft reduction are determined in a method of continuous casting in accordance with a method utilizing the thickness of a slab strand to prevent center segregation from occurring in the strand due to an insufficient pressing rate or internal cracks from occurring in the strand due to an excessively high pressing rate.Type: GrantFiled: December 24, 2014Date of Patent: January 28, 2020Assignee: JFE Steel CorporationInventors: Keigo Toishi, Hiroyuki Ono, Norichika Aramaki, Yuji Miki
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Publication number: 20200016651Abstract: A continuous steel casting method includes producing a strand. The producing of the strand includes pouring molten steel into a mold of a continuous casting machine and withdrawing a solidified shell from the mold, the solidified shell being a solidified portion of the molten steel. The method includes applying a static magnetic field to at least a portion of a region of the strand, the strand being in the continuous casting machine, the region being a region where a solid fraction fs at a thickness-wise middle position of the strand is in a given range, the static magnetic field having a magnetic field strength of greater than or equal to 0.15 T and being in a direction orthogonal to a direction in which the strand is withdrawn, the static magnetic field being applied at an application time ratio of greater than or equal to 10%.Type: ApplicationFiled: March 29, 2017Publication date: January 16, 2020Applicant: JFE Steel CorporationInventors: Tomoya Odagaki, Norichika Aramaki, Yuji Miki, Naoki Kikuchi
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Patent number: 10406597Abstract: Provided is a continuous casting method of steel that prevents a solidification completion position from being changed even when a drawing speed V of a cast slab is changed. The method includes drawing a cast slab by setting a drawing speed V0 while spraying cooling water to the cast slab at a cooling water spray amount W0 [kg/ton-cast slab]. Then, changing the drawing speed to the speed V1 while spraying cooling water to the cast slab at a cooling water spray amount W1 [kg/ton-cast slab]. The method further includes spraying cooling water to the cast slab at a cooling water spray amount Wt [kg/ton-cast slab] during a period of time t that is obtained by dividing a target length Lt by the drawing speed V0. The water spray amount Wt satisfying either formula (1): Wt<W1 under a condition of V1<V0, or formula (2): Wt>W1 under a condition of V1>V0.Type: GrantFiled: January 22, 2016Date of Patent: September 10, 2019Assignee: JFE STEEL CORPORATIONInventors: Keigo Toishi, Hiroyuki Ohno, Norichika Aramaki, Yuji Miki
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Patent number: 10072320Abstract: A method of producing a steel material includes a step of adding Ca to molten steel with an amount of Ca adjusted within a range satisfying the formula (1) below: 0.5 ? { Ca · y ? / ? 100 - ( [ S · W ? / ? 100 ) · 40.08 ? / ? 32.07 } ? 56.08 40.08 ( [ Al 2 ? O 3 ] · W ? / ? 100 ) ? 1.5 ( 1 ) where Ca is the amount [kg] of Ca added, y is an yield [%] of Ca, [S] is a concentration [% by mass] of S in the steel before addition of Ca, [Al2O3] is an amount [% by mass] of Al2O3 in the steel before addition of Ca, and W is a weight [kg] of the molten steel.Type: GrantFiled: June 4, 2014Date of Patent: September 11, 2018Assignee: JFE Steel CorporationInventors: Kohei Furumai, Norichika Aramaki, Yuji Miki, Takeshi Murai, Toru Inoue, Yukio Usui, Tomoharu Ishida
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Publication number: 20180001377Abstract: Provided is a continuous casting method of steel that prevents a solidification completion position from being changed even when a drawing speed V of a cast slab is changed. The method includes drawing a cast slab by setting a drawing speed V0 while spraying cooling water to the cast slab at a cooling water spray amount W0 [kg/ton-cast slab]. Then, changing the drawing speed to the speed V1 while spraying cooling water to the cast slab at a cooling water spray amount W1 [kg/ton-cast slab]. The method further includes spraying cooling water to the cast slab at a cooling water spray amount Wt [kg/ton-cast slab] during a period of time t that is obtained by dividing a target length Lt by the drawing speed V0. The water spray amount Wt satisfying either formula (1): Wt<W1 under a condition of V1<V0, or formula (2): Wt>W1 under a condition of V1>V0.Type: ApplicationFiled: January 22, 2016Publication date: January 4, 2018Applicant: JFE STEEL CORPORATIONInventors: Keigo TOISHI, Hiroyuki OHNO, Norichika ARAMAKI, Yuji MIKI
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Publication number: 20170361372Abstract: Continuous casting mold is provided having a mold copper plate having plural separate portions filled with foreign metal formed by filling concave grooves formed on the inner wall surface of the mold copper plate and having a diameter of 2 mm to 20 mm in the inner wall surface at least in the region from a meniscus to a position located 20 mm or more lower than the meniscus with the foreign metal whose thermal conductivity is 80% or less or 125% or more of the mold copper plate, the ratio of the Vickers hardness HVc of the mold copper plate to the Vickers hardness HVm of the filling metal satisfies expression (1), and the ratio of the thermal expansion coefficient ?c of the mold copper plate and the thermal expansion coefficient ?m of the filling metal satisfies expression (2). 0.3 HVc/HVm?2.3 ??(1), 0.7??c/?m?3.Type: ApplicationFiled: October 23, 2015Publication date: December 21, 2017Applicant: JFE STEEL CORPORATIONInventors: Kohei Furumai, Naomichi Iwata, Norichika Aramaki, Yuji Miki