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1. 发明专利

JPH07214267A METHOD FOR CONTROLLING CHANGE OF WIDTH FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH07214267A
公开(公告)日：1995-08-15
申请号：JP625994
申请日：1994-01-25
申请人： NIPPON STEEL CORP
发明人： HASHIMOTO MUNEAKI , KONISHI JUNPEI , FURUTA TOMOHIRO , OSHITA ISAO , MURAYAMA TOSHIO
IPC分类号： B22D11/16 , B22D11/04 , B22D11/05
摘要： PURPOSE:To efficiently and continuously cast slabs having different widths without interrupting the casting work by predicting the completing position of this charge just after starting the casting, obtaining the joint position, deciding a width change forbidding range and a changeable sparing length and obtaining the start of width change and the completing point. CONSTITUTION:At the time of changing the width of cast slab during the continuous casting, the completing position of this charge is predicted just after starting the casting based on the producing specification of molten steel quantity, width, thickness, sp. gr. of the molten steel, length of the cast slab, etc., to obtain the joint position based on the casting result and the remained molten steel quantity. The prescribed width change forbidding range and the changeable sparing length are decided from this joint position and the start of width change and the completing point are obtd. from the width changeable quantity of this kind of steel, changeable speed and casting speed to execute the width change in the permissible value of the cast slab. By this method, the necessary sparing length to the width change is minimized and the automatic width change at the joint part oft his charge can be executed and the yield is improved.

2. 发明专利

JP2002361378A CONTINUOUS CASTING METHOD FOR CASTING LITTLE IN BUBBLE DEFECT 失效
公开(公告)号：JP2002361378A
公开(公告)日：2002-12-17
申请号：JP2001177057
申请日：2001-06-12
申请人： NIPPON STEEL CORP
发明人： SEZE AKIFUMI , MOROHOSHI TAKASHI , KUSUNOKI SHINTARO , KONISHI JUNPEI , YAMAZAKI YASUO
IPC分类号： B22D11/10 , B22D1/00 , B22D11/117 , C21C7/00
摘要： PROBLEM TO BE SOLVED: To provide a continuous casting method for a casting little in a bubble defect capable of suppressing the clogging of an immersion nozzle, and preventing the bubble defect such as linear flaw and a bulging flaw generating in a steel material worked by rolling a casting. SOLUTION: In the continuous casting method for the casting, wherein while blowing an inert gas into an immersion nozzle provided on a tundish 12, a molten metal 11 in a tundish 12 is poured into a mold 13 using the immersion nozzle 14, and by the cooling in the mold 13 and the cooling by water spray from a cooling nozzle mounted on a support segment 15 provided on the understream side of the mold 13, the molten steel 13 is solidified to manufacture the casting, the inert gas to be blown into the immersion nozzle 14 contains a nitrogen gas.

3. 发明专利

JPH10180429A METHOD FOR CONTINUOUSLY CASTING MOLTEN STEEL 失效
公开(公告)号：JPH10180429A
公开(公告)日：1998-07-07
申请号：JP35497996
申请日：1996-12-20
申请人： NIPPON STEEL CORP
发明人： KONISHI JUNPEI , INADA TOMOMITSU , INAOKA KAZUMA
IPC分类号： B22D11/12 , B22D11/128
摘要： PROBLEM TO BE SOLVED: To provide a continuous casting method for molten metal which restrains the crack developed in a cast slab to the min. limit and also, can execute the operation having high production efficiency. SOLUTION: The molten steel 11 held in the tundish 12 is supplied into a mold 15 constituted with vertical mold walls to form the cast slab 21 having the solidified shell in the periphery thereof. Further, the cast slab 21 is introduced into a vertical drawing-out part 17 having 0.8m to

4. 发明专利

JP2004202584A Continuous casting method for high-quality cast piece 审中-公开
公开(公告)号：JP2004202584A
公开(公告)日：2004-07-22
申请号：JP2004114573
申请日：2004-04-08
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： KONISHI JUNPEI , INAOKA KAZUMA
IPC分类号： B22D11/115 , B22D11/04 , B22D11/11 , B22D27/02
摘要： PROBLEM TO BE SOLVED: To provide a continuous casting method for a high-quality cast piece which prevents defects and inner cracks brought about by inclusions in the surface layer and internal part of a cast piece and, at the same time, avoids the significant alteration of a continuous casting equipment and can easily be realized at low cost.
SOLUTION: In the continuous casting method for the high-quality cast piece which liquid steel 11 is introduced into a mold 13 through a dipping nozzle 15 and continuously withdrawn downward while it is solidified with the mold 13, a vertical part 19 is provided below a meniscus 20 of the liquid steel 11, and also a stream 22 circling along a peripheral wall near the meniscus 20 of the liquid steel 11 is provided through an electromagnetic stirring device 21 installed at a long side of the mold 13.
COPYRIGHT: (C)2004,JPO&NCIPI

5. 发明专利

JP2004148400A Immersion nozzle for continuous casting 有权
公开(公告)号：JP2004148400A
公开(公告)日：2004-05-27
申请号：JP2002319760
申请日：2002-11-01
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： MORI KENICHI , HIRAMOTO YUJI , FUKUNAGA SHINICHI , KONISHI JUNPEI , MOROHOSHI TAKASHI
IPC分类号： B22D11/10 , B22D11/00 , B22D41/50
摘要： PROBLEM TO BE SOLVED: To provide an immersion nozzle for continuous casting with which a defective product caused by gas bubble and inclusion are prevented and the quality of a produced cast slab is made to be good.
SOLUTION: This immersion nozzle is provided with a cylindrical part 11 in which molten steel is made to flow, a first spouting part 12 integrally connected with the bottom of the cylindrical part 11 and provided with a plurality of small spouting holes 14 at both sides, and a second spouting part 15 forming a space part 17 covering the plurality of small spouting holes 14 disposed at both sides and provided with large spouting holes 16 spouting molten steel flowing through the cylindrical part 11 and the first spouting part 12 to the outside from the space part 17, respectively.
COPYRIGHT: (C)2004,JPO

6. 发明专利

JPH05318050A METHOD FOR PREVENTING AIR-OXIDATION OF MOLTEN METAL 失效
公开(公告)号：JPH05318050A
公开(公告)日：1993-12-03
申请号：JP13272792
申请日：1992-05-25
申请人： NIPPON STEEL CORP
发明人： KONISHI JUNPEI , FUKUNAGA SHINICHI
IPC分类号： B22D11/10 , B22D11/103 , B22D11/119
摘要： PURPOSE:To effectively prevent the air-oxidation caused by spattering of molten metal in the initial stage of pouring at the time of pouring the molten metal into a tundish through a long nozzle. CONSTITUTION:At the time of pouring the molten metal into the tundish 1 through the long nozzle 2, a rising-up basin of the poured molten metal is formed to the higher position than the lower end of the long nozzle 2 surrounding the long nozzle 2, and the poured molten metal is over-flowed into the tundish 1 from the upper part of this basin. A narrow frame is formed at the opening part of a nozzle and a pool of the poured molten metal is almost instantly formed in there so as to dip the upper end part of the nozzle, and the time contacting the flowing-down molten metal with the air in the atmosphere is extremely short and the oxidation caused by the contact with the air is made to be extremely little.

7. 发明专利

JP2004344935A Dipping nozzle for continuous casting, and continuous casting method using the same 审中-公开
公开(公告)号：JP2004344935A
公开(公告)日：2004-12-09
申请号：JP2003145188
申请日：2003-05-22
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： MORI KENICHI , HIRAMOTO YUJI , FUKUNAGA SHINICHI , KONISHI JUNPEI , MOROHOSHI TAKASHI
IPC分类号： B22D11/10 , B22D11/00 , B22D11/20 , B22D41/50 , B22D41/54 , B22D41/58
摘要： PROBLEM TO BE SOLVED: To provide a dipping nozzle for continuous casting capable of slowing the flow of molten steel in a mold, forming the uniform flow, preventing generation of defects such as bubbles and inclusions, and realizing high-speed casting, and a continuous casting method using the dipping nozzle.
SOLUTION: In the dipping nozzle 10 for continuous casting having a cylindrical part 12 through which molten steel 11 passes from a top to a bottom, and a pair of right and left discharge ports 13 and 14 which are provided on a lower portion thereof and capable of discharging the molten steel 11 in the transverse direction, a plurality of small holes 15 are formed in the discharge ports 13 and 14, and the ratio D2/D1 is 0.8-1.2, where D1 denotes the inside diameter of a portion except the lower portion of the cylindrical part 12, and D2 denotes the space between the discharge ports 13 and 14. In the continuous casting method, the molten steel 11 is poured into a mold 31 via the dipping nozzle 10 for continuous casting, and drawn from the mold 31 at a casting rate of ≥0.6 m/min. while the molten steel is solidified.
COPYRIGHT: (C)2005,JPO&NCIPI

8. 发明专利

JP2004344900A Dipping nozzle and continuous casting method using the same 有权
公开(公告)号：JP2004344900A
公开(公告)日：2004-12-09
申请号：JP2003142473
申请日：2003-05-20
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： MORI KENICHI , HIRAMOTO YUJI , FUKUNAGA SHINICHI , KONISHI JUNPEI , MOROHOSHI TAKASHI
IPC分类号： B22D11/10 , B22D41/50
摘要： PROBLEM TO BE SOLVED: To provide a dipping nozzle capable of slowing the flow of molten steel in a mold, forming the uniform flow, preventing generation of defects such as bubbles and inclusions, and realizing high-speed casting, and a continuous casting method using the dipping nozzle.
SOLUTION: In the dipping nozzle 10 having a cylindrical part 12 through which molten steel 11 passes from a top to a bottom, and a pair of right and left discharge ports 13 and 14 which are provided on a lower portion thereof capable of discharging the molten steel 11 in the transverse direction, hood parts 15 and 16 capable of guiding the flow of the molten steel 11 discharged from the discharge ports 13 and 14 are provided on either or each of at least upper and lower parts of the discharge ports 13 and 14, and the ratio D2/D1 is 0.8-1.2, where D1 denotes the inside diameter of a portion except the lower part of the cylindrical part 12, and D2 denotes the space between the discharge ports 13 and 14. In the continuous casting method, the molten steel 11 is poured into a mold 41 via the dipping nozzle 10, and drawn from the mold 41 at a casting speed of ≥0.6 m/min. while the molten steel is solidified.
COPYRIGHT: (C)2005,JPO&NCIPI

9. 发明专利

JPH1133687A METHOD FOR CONTINUOUSLY CASTING HIGH QUALITY CAST SLAB 失效
公开(公告)号：JPH1133687A
公开(公告)日：1999-02-09
申请号：JP20235597
申请日：1997-07-10
申请人： NIPPON STEEL CORP
发明人： KONISHI JUNPEI , INAOKA KAZUMA
IPC分类号： B22D27/02 , B22D11/10 , B22D11/115
摘要： PROBLEM TO BE SOLVED: To prevent the development of defect and internal crack caused by inclusion on the surface layer and in the inner part of a cast slab formed with the solidification, to avoid drastical reconstruction of a continuous casting apparatus and to obtain the low cost. SOLUTION: This casting method is executed by pouring molten steel 11 into a mold 13 through an immersion nozzle 15 and continuously drawing downward while solidifying the molten steel 11 with the mold 3. In such a case, a vertical part 19 to the lower part from a meniscus 20 of the molten steel 11 is arranged and also, the circulating flow is given along the peripheral wall of the mold near the meniscus 20 of the molten steel 11 through an electromagnetic stirring device 21 arranged at the long sides 13a of the mold 13 to execute the casting.

10. 发明专利

JPH04279261A METHOD FOR CONTINUOUSLY CASTING HIGH QUALITY CAST SLAB 失效
公开(公告)号：JPH04279261A
公开(公告)日：1992-10-05
申请号：JP6380591
申请日：1991-03-06
申请人： NIPPON STEEL CORP
发明人： SHIRATO MASATERU , IMAMURA SHIGERU , MIYAWAKI KOJI , KONISHI JUNPEI
IPC分类号： B22D11/16 , G01N1/32
摘要： PURPOSE:To accurately discriminate pin hole defect in a continuously casted slab, to supply the good cast slab and to effectively control continuously cast condition from the detected value to obtain the high quality cast slab. CONSTITUTION:Molten metal is continuously cast into the cast slab, and after grinding and polishing surface of the cast slab, high viscosity fats are applied on the surface thereof, and successively, the surface of cast slab finish-polished is transferred to a sticking tape and fixed on the sheet and the surface defect on the cast slab is compared and discriminated with the preset reference value and also, based on this discriminated value, the continuous casting condition is controlled.

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