Patents by Inventor Sadanori Imada
Sadanori Imada 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: 7556701Abstract: A method for cooling a hot rolled steel strip including transferring a hot rolled steel strip while ejecting cooling water from a cooling means at a specified ejecting condition; pinching a top end of the hot rolled steel strip by a pinching roll, at the inlet of the cooling means and/or just behind the cooling means and/or at a position on the way of the cooling means; and releasing the hot rolled steel strip sequentially from a pinch roll arranged at an upstream side, concurrently with the arrival of a top end of the steel strip to a tension adding means arranged at a downstream side.Type: GrantFiled: December 1, 2006Date of Patent: July 7, 2009Assignee: JFE Steel CorporationInventors: Akio Fujibayashi, Sadanori Imada, Yoshimichi Hino, Toru Minote, Yoichi Motoyashiki, Shozo Ikemune
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Patent number: 7357894Abstract: An apparatus for cooling a hot rolled steel strip including a transfer means comprising transfer rolls to feed a steel strip which has been hot rolled by a finishing mill; a cooling means for cooling the steel strip; and accompanying rolls arranged with a clearance over the thickness of the steel strip at a position where the accompanying rolls face the transfer rolls through the steel strip to be transferred. The accompanying rolls rotate at nearly an equal peripheral speed as the transfer rolls or at a peripheral speed greater than the transfer speed of the steel strip.Type: GrantFiled: January 17, 2006Date of Patent: April 15, 2008Assignee: JFE Steel CorporationInventors: Akio Fujibayashi, Sadanori Imada, Yoshimichi Hino, Toru Minote, Yoichi Motoyashiki, Shozo Ikemune
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Publication number: 20070074794Abstract: A method for cooling a hot rolled steel strip including transferring a hot rolled steel strip while ejecting cooling water from a cooling means at a specified ejecting condition; pinching a top end of the hot rolled steel strip by a pinching roll, at the inlet of the cooling means and/or just behind the cooling means and/or at a position on the way of the cooling means; and releasing the hot rolled steel strip sequentially from a pinch roll arranged at an upstream side, concurrently with the arrival of a top end of the steel strip to a tension adding means arranged at a downstream side.Type: ApplicationFiled: December 1, 2006Publication date: April 5, 2007Applicant: JFE Steel CorporationInventors: Akio Fujibayashi, Sadanori Imada, Yoshimichi Hino, Toru Minote, Yoichi Motoyashiki, Shozo Ikemune
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Publication number: 20060113013Abstract: An apparatus for cooling a hot rolled steel strip including a transfer means comprising transfer rolls to feed a steel strip which has been hot rolled by a finishing mill; a cooling means for cooling the steel strip; and accompanying rolls arranged with a clearance over the thickness of the steel strip at a position where the accompanying rolls face the transfer rolls through the steel strip to be transferred. The accompanying rolls rotate at nearly an equal peripheral speed as the transfer rolls or at a peripheral speed greater than the transfer speed of the steel strip.Type: ApplicationFiled: January 17, 2006Publication date: June 1, 2006Applicant: NKK CORPORATIONInventors: Akio Fujibayashi, Sadanori Imada, Yoshimichi Hino, Toru Minote, Yoichi Motoyashiki, Shozo Ikemune
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Patent number: 7052647Abstract: An apparatus for cooling a hot rolled steel strip comprising a transfer means arranged behind a final finishing mill, the transfer means comprising a plurality of transfer rolls for transferring the steel strip; at least one upper surface cooling means arranged at an upper surface side of the transfer means for cooling the steel strip by ejecting cooling water to an upper surface of the steel strip, the upper surface cooling means being capable of moving freely up and down and having a water breaking means at least at an outlet side of the cooling apparatus and at a position corresponding to the transfer rolls; and at least one lower surface cooling means arranged at a lower surface side of the transfer means relative to the upper surface cooling means and the steel strip to be transferred, for cooling the hot strip by ejecting cooling water at a lower surface of the steel strip.Type: GrantFiled: March 3, 2004Date of Patent: May 30, 2006Assignee: JFE Steel CorporationInventors: Akio Fujibayashi, Sadanori Imada, Yoshimichi Hino, Toru Minote, Yoichi Motoyashiki, Shozo Ikemune
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Publication number: 20060065329Abstract: The present invention relates to a high strength steel sheet consisting essentially of 0.04 to 0.1% C, 0.5% or less Si, 0.5 to 2% Mn, 0.05% or less P, 0.005% or less O, 0.005% or less S, by weight, having 10 ?m or less of average ferritic grain size, and 20 mm/mm2 or less of generation frequency A, which generation frequency A is defined as the total length of a banded secondary phase structure observed per 1 mm2 of steel sheet cross section along the rolling direction thereof. The steel sheet is manufactured by, for example, a method comprising the steps of: hot-rolling a continuously cast slab having the composition described above at temperatures of Ar3 transformation point or above directly or after reheating thereof; and cooling the hot-rolled steel sheet within 2 seconds down to the temperatures of from 600 to 750° C. at cooling speeds of from 100 to 2,000° C./sec, followed by coiling the cooled steel sheet at temperatures of from 450 to 650° C.Type: ApplicationFiled: November 10, 2005Publication date: March 30, 2006Applicant: JFE STEEL CORPORATIONInventors: Tadashi Inoue, Yoichi Motoyashiki, Hiroyasu Kikuchi, Sadanori Imada, Takayuki Odake, Yasunobu Nagataki, Toru Inazumi
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Publication number: 20050000606Abstract: A method for manufacturing a steel sheet comprising rough-rolling a steel consisting essentially of 0.04 to 0.12 weight % C, 0.25 to 2 weight % Si, 0.5 to 2.5 weight % Mn, 0.1 weight % or less Al, and a balance of substantially Fe and inevitable impurities to form a sheet bar; finish-rolling the sheet bar at a rolling end temperature of the Ar3 transformation point or more; primary-cooling the finish-rolled steel sheet within 1 second after completing the finish-rolling at a cooling speed of higher than 200° C./sec through a cooling range where-the difference between the start temperature of the cooling and the end temperature of the cooling is 100° C. to below 250° C.; slowly cooling the primary-cooled steel at a cooling speed of 10° C./sec or less, for 2 seconds to less than 20 seconds, at a temperature of 580° C. to 720° C.; and coiling the slowly cooled steel sheet at a temperature of 400° C. to below 540° C.Type: ApplicationFiled: July 26, 2004Publication date: January 6, 2005Applicant: NKK CORPORATIONInventors: Tadashi Inoue, Yoichi Motoyashiki, Hiroyasu Kikuchi, Yoshimasa Funakawa, Hiroshi Nakata, Sadanori Imada, Toru Inazumi
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Patent number: 6818079Abstract: A method for manufacturing a steel sheet comprising continuously casting a steel containing 0.04 to 0.2 wt. % C, 0.25 to 2 wt. % Si, 0.5 to 2.5 wt. % Mn, and 0.1 wt. % or less Al to form a slab; hot-rolling by rough-rolling the slab to form a sheet bar and finish-rolling the sheet bar with a reduction in thickness at the final stand of less than 30%, the finish-rolling being completed at a temperature from the Ar3 transformation point to the Ar3 transformation point +60° C.; primary-cooling the hot-rolled steel sheet, the primary cooling being started within 1 second after the completion of hot-rolling and conducting the cooling at a cooling speed of higher than 200° C./sec down to a temperature of Ar3 −30° C. to the Ar1 transformation point; slow cooling or air-cooling the primary-cooled steel sheet at a temperature of the Ar3 transformation point to the Ar1 transformation point at 10° C.Type: GrantFiled: May 27, 2003Date of Patent: November 16, 2004Assignee: NKK CorporationInventors: Tadashi Inoue, Yoichi Motoyashiki, Hiroyasu Kikuchi, Yoshimasa Funakawa, Hiroshi Nakata, Sadanori Imada, Toru Inazumi
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Publication number: 20040201143Abstract: An apparatus for cooling a hot rolled steel strip comprising a transfer means arranged behind a final finishing mill, the transfer means comprising a plurality of transfer rolls for transferring the steel strip; at least one upper surface cooling means arranged at an upper surface side of the transfer means for cooling the steel strip by ejecting cooling water to an upper surface of the steel strip, the upper surface cooling means being capable of moving freely up and down and having a water breaking means at least at an outlet side of the cooling apparatus and at a position corresponding to the transfer rolls; and at least one lower surface cooling means arranged at a lower surface side of the transfer means relative to the upper surface cooling means and the steel strip to be transferred, for cooling the hot strip by ejecting cooling water at a lower surface of the steel strip.Type: ApplicationFiled: March 3, 2004Publication date: October 14, 2004Applicant: NKK CORPORATIONInventors: Akio Fujibayashi, Sadanori Imada, Yoshimichi Hino, Toru Minote, Yoichi Motoyashiki, Shozo Ikemune
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Publication number: 20040112482Abstract: The present invention relates to a high strength steel sheet consisting essentially of 0.04 to 0.1% C, 0.5% or less Si, 0.5 to 2% Mn, 0.05% or less P, 0.005% or less O, 0.005% or less S, by weight, having 10 &mgr;m or less of average ferritic grain size, and 20 mm/mm2 or less of generation frequency A, which generation frequency A is defined as the total length of a banded secondary phase structure observed per 1 mm2 of steel sheet cross section along the rolling direction thereof. The steel sheet is manufactured by, for example, a method comprising the steps of: hot-rolling a continuously cast slab having the composition described above at temperatures of Ar3 transformation point or above directly or after reheating thereof; and cooling the hot-rolled steel sheet within 2 seconds down to the temperatures of from 600 to 750° C. at cooling speeds of from 100 to 2,000° C./sec, followed by coiling the cooled steel sheet at temperatures of from 450 to 650° C.Type: ApplicationFiled: July 23, 2003Publication date: June 17, 2004Applicant: NKK CORPORATIONInventors: Tadashi Inoue, Yoichi Motoyashiki, Hiroyasu Kikuchi, Sadanori Imada, Yasunobu Nagataki, Toru Inazumi
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Patent number: 6733720Abstract: A lower surface cooling box 12 is arranged between transfer rolls 11 on a runout table 3 and an upper cooling box 14 moving freely is arranged at a position corresponding to the cooling box 12 to eject cooling water to the steel strip symmetrically in the vertical direction. The steel strip passes the center of converge of cooling water from upper and lower surfaces of the steel strip. A water breaking roll 16 is provided elevating freely at least at the outlet side rotating at the same peripheral speed as the transfer rolls and is rotated to lower concurrently with passing of the steel strip top at the cooling apparatus. The upper cooling box is also lowered concurrently to cool the steel strip.Type: GrantFiled: October 24, 2001Date of Patent: May 11, 2004Assignee: NKK CorporationInventors: Akio Fujibayashi, Sadanori Imada, Yoshimichi Hino, Toru Minote, Yoichi Motoyashiki, Shozo Ikemune
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Patent number: 6663725Abstract: The present invention relates to a high strength steel sheet consisting essentially of 0.04 to 0.1% C, 0.5% or less Si, 0.5 to 2% Mn, 0.05% or less P, 0.005% or less 0, 0.005% or less S, by weight, having 10 &mgr;m or less of average ferritic grain size, and 20 mm/mm2 or less of generation frequency A, which generation frequency A is defined as the total length of a banded secondary phase structure observed per 1 mm2 of steel sheet cross section along the rolling direction thereof. The steel sheet is manufactured by, for example, a method comprising the steps of: hot-rolling a continuously cast slab having the composition described above at temperatures of Ar3 transformation point or above directly or after reheating thereof; and cooling the hot-rolled steel sheet within 2 seconds down to the temperatures of from 600 to 750° C. at cooling speeds of from 100 to 2,000° C./sec, followed by coiling the cooled steel sheet at temperatures of from 450 to 650° C.Type: GrantFiled: April 5, 2001Date of Patent: December 16, 2003Assignee: NKK CorporationInventors: Tadashi Inoue, Hiroyasu Kikuchi, Sadanori Imada, Takayuki Odake
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Patent number: 6652670Abstract: The method for manufacturing steel sheet comprises the steps of: rough-rolling to form a sheet bar; finish-rolling the sheet bar to form a steel strip; applying primary cooling and secondary cooling to the finish-rolled steel strip; and coiling the secondary-cooled steel strip. The primary cooling is conducted at cooling speeds of 120° C./sec or more down to the temperatures of from 500 to 800° C. The secondary cooling is conducted at cooling speeds of less than 60° C./sec.Type: GrantFiled: April 18, 2001Date of Patent: November 25, 2003Inventors: Tadashi Inoue, Yoichi Motoyashiki, Hiroyasu Kikuchi, Yasuhide Ishiguro, Sadanori Imada, Toru Inazumi
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Publication number: 20030205302Abstract: A method for manufacturing a steel sheet comprising continuously casting a steel containing 0.04 to 0.2 wt. % C, 0.25 to 2 wt. % Si, 0.5 to 2.5 wt. % Mn, and 0.1 wt. % or less Al to form a slab; hot-rolling by rough-rolling the slab to form a sheet bar and finish-rolling the sheet bar with a reduction in thickness at the final stand of less than 30%, the finish-rolling being completed at a temperature from the Ar3 transformation point to the Ar3 transformation point +60° C.; primary-cooling the hot-rolled steel sheet, the primary cooling being started within 1 second after the completion of hot-rolling and conducting the cooling at a cooling speed of higher than 200° C./sec down to a temperature of Ar3 −30° C. to the Ar1 transformation point; slow cooling or air-cooling the primary-cooled steel sheet at a temperature of the Ar3 transformation point to the Ar1 transformation point at 10° C.Type: ApplicationFiled: May 27, 2003Publication date: November 6, 2003Applicant: NKK CORPORATIONInventors: Tadashi Inoue, Yoichi Motoyashiki, Hiroyasu Kikuchi, Yoshimasa Funakawa, Hiroshi Nakata, Sadanori Imada, Toru Inazumi
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Patent number: 6632295Abstract: A high tensile strength hot-rolled steel sheet comprises 0.04 to 0.09% C, 0.1% or less Si, 0.5 to 1.5% Mn, 0.02% or less P, 0.01% or less S, 0.1% or less Al, 0.001 to 0.008% N, and 0.01 to 0.15% Ti, by mass %, the content of ingredient there each satisfying the equation (1), and the ferritic grain size &agr; (&mgr;m) satisfying the equation (2): [C]+7×[Si]+0.1×[Mn]+[P]+14×[S]+1.75×[Al] +23×[N]+[Ti]+18×[O]+7×[Cu]+18×[Sn]+7×[Mo]+ 1.7×[Cr]+70×[B]+7×[Ca]+14×[Zr]+14×[V]+7×[Nb] ≦2 (1) 3≦&agr;≦60×[Ti]+8 (2) where, [X] denotes the content (mass %) of element X.Type: GrantFiled: May 24, 2001Date of Patent: October 14, 2003Assignee: NKK CorporationInventors: Hiroshi Nakata, Tadashi Inoue, Hiroyasu Kikuchi, Sadanori Imada, Akira Hiura, Takeshi Nakahara, Satoshi Ishijima, Yoshimasa Funakawa, Toru Inazumi
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Patent number: 6623573Abstract: The method for manufacturing steel sheet comprises the steps of: forming a sheet bar; forming a steel strip; primary-cooling; air-cooling; secondary-cooling; and coiling. The sheet bar is finish-rolled at finish temperatures of (Ar3 transformation point −20° C.) or more. The primary cooling cools the finish-rolled steel strip at cooling speeds of more than 120° C./sec down to the temperatures ranging from 500 to 800° C.Type: GrantFiled: April 19, 2001Date of Patent: September 23, 2003Assignee: NKK CorporationInventors: Tadashi Inoue, Yoichi Motoyashiki, Hiroyasu Kikuchi, Sadanori Imada
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Patent number: 6554925Abstract: The method for manufacturing cold-rolled steel sheet comprises the steps of: rough-rolling a slab using a rough-rolling unit; finish-rolling the sheet bar using a continuous hot finishing-rolling mill; cooling the hot-rolled steel strip on a runout table; coiling thus cooled hot-rolled steel strip; and applying picking, cold-rolling the hot-rolled steel strip, and final annealing to the cold-rolled steel strip.Type: GrantFiled: March 29, 2001Date of Patent: April 29, 2003Assignee: NKK CorporationInventors: Tadashi Inoue, Yasuhide Ishiguro, Yoichi Motoyashiki, Sadanori Imada, Toru Inazumi
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Publication number: 20020134473Abstract: A lower surface cooling box 12 is arranged between transfer rolls 11 on a runout table 3 and an upper cooling box 14 moving freely is arranged at a position corresponding to the cooling box 12 to eject cooling water to the steel strip symmetrically in the vertical direction. The steel strip passes the center of convergence of cooling water from upper and lower surfaces of the steel strip. A water breaking roll 16 is provided elevating freely at least at the outlet side rotating at the same peripheral speed as the transfer rolls and is rotated to lower concurrently with passing of the steel strip top at the cooling apparatus. The upper cooling box is also lowered concurrently to cool the steel strip.Type: ApplicationFiled: October 24, 2001Publication date: September 26, 2002Applicant: NKK CORPORATIONInventors: Akio Fujibayashi, Sadanori Imada, Yoshimichi Hino, Toru Minote, Yoichi Motoyashiki, Shozo Ikemune
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Publication number: 20020029828Abstract: A high tensile strength hot-rolled steel sheet comprises 0.04 to 0.09% C, 0.1% or less Si, 0.5 to 1.5% Mn, 0.02% or less P, 0.01% or less S, 0.1% or less Al, 0.001 to 0.008% N, and 0.01 to 0.Type: ApplicationFiled: May 24, 2001Publication date: March 14, 2002Applicant: NKK CORPORATIONInventors: Hiroshi Nakata, Tadashi Inoue, Hiroyasu Kikuchi, Sadanori Imada, Akira Hiura, Takeshi Nakahara, Satoshi Ishijima, Yoshimasa Funakawa, Toru Inazumi
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Publication number: 20020007882Abstract: The method for manufacturing steel sheet comprises the steps of: forming a sheet bar; forming a steel strip; primary-cooling; air-cooling; secondary-cooling; and coiling. The sheet bar is finish-rolled at finish temperatures of (Ar3 transformation point−20° C.) or more. The primary cooling cools the finish-rolled steel strip at cooling speeds of more than 120° C./sec down to the temperatures ranging from 500 to 800° C.Type: ApplicationFiled: April 19, 2001Publication date: January 24, 2002Applicant: NKK CORPORATIONInventors: Tadashi Inoue, Yoichi Motoyashiki, Hiroyasu Kikuchi, Yoshimasa Funakawa, Hiroshi Nakata, Sadanori Imada, Toru Inazumi