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1. 发明专利

JP2000210761A CONTINUOUS CASTING METHOD, MOLTEN METAL POURING MECHANISM AND MOLTEN METAL POURING METHOD 失效
公开(公告)号：JP2000210761A
公开(公告)日：2000-08-02
申请号：JP32737799
申请日：1999-11-17
申请人： NIPPON KOKAN KK , SHINAGAWA REFRACTORIES CO
发明人： KATO AKIRA , WATANABE KYOJI , KURANAGA TAICHI , MURAKI YASUNORI , SHIBUYA KIYOBUMI , OSAKO TAKASHI , MAEDA HIROSHI , KUWANO SEIGO , MORIWAKI MASAHIRO , YOSHIKAWA MICHITOKU
IPC分类号： B22D11/10 , B22D41/36 , B22D41/42 , B22D41/50 , B22D41/60
摘要： PROBLEM TO BE SOLVED: To provide a continuous steel casting method by which the time for pouring the molten steel into a tundish can be extended in the state of closing a sliding nozzle. SOLUTION: When the molten steel in the tundish 1 is supplied into a mold from a molten steel pouring hole 3 provided at the bottom part through an upper nozzle 4, sliding nozzle 5 and immersion nozzle 6 and continuously cast, the upper nozzle 4 is heated to >=800 deg.C by a heater 21 provided inside the upper nozzle 4 and the sliding nozzle 5 is heated to >=500 deg.C by the heater provided inside the sliding nozzle 5, or the gas heated to >=600 deg.C through the sliding nozzle 5 is supplied into the molten steel, thereby the molten steel is poured into the tundish 1 in the state of closing the sliding nozzle 5, while stirring the molten steel, and then the sliding nozzle 5 is opened to start the casting.

2. 发明专利

JP2000153348A STRUCTURE FOR PROTECTING WIRING 失效
公开(公告)号：JP2000153348A
公开(公告)日：2000-06-06
申请号：JP32664298
申请日：1998-11-17
申请人： NIPPON KOKAN KK , SHINAGAWA REFRACTORIES CO
发明人： MURAKI YASUNORI , KURANAGA TAICHI , WATANABE KYOJI , KATO AKIRA , MORIWAKI MASAHIRO
IPC分类号： B22D11/10 , B22D41/58 , B22D41/60
摘要： PROBLEM TO BE SOLVED: To obtain a protecting structure for wiring, etc., which is used for process, such as iron-making process, and unnecessary to an exclusive utility and hard for cooling, etc., and a specific coating for heat prevention by inserting wires or the like used in a prescribed process into pipings of a process gas used in the process. SOLUTION: A molten steel pouring part in a tundish storing the molten steel at continuous casting time, has a tundish tuyere brick 10, and an upper nozzle 1 is inserted therein, and a nozzle hole 2 is formed along the perpendicular direction in the center part. Gas pipings 12 for supplying Ar gas for stirring the molten steel in the tundish, are connected with the lower part of the upper nozzle 1. Leading wires 6 are connected with plane-like exothermic bodies 4 arranged in an annular space part 3 formed at the outside of the nozzle hole 2 and compensating leading wires 8 are connected with thermocouples 7 embedded in the upper nozzle 1, and the leading wires 6, 8 are inserted into the pipings 12. Since the piping 12 has the heat resistance, the leading wires 6, 8 inserted therein, are protected from the heat of the molten steel.

3. 发明专利

JP2000153347A NOZZLE FOR POURING MOLTEN METAL 失效
公开(公告)号：JP2000153347A
公开(公告)日：2000-06-06
申请号：JP32658698
申请日：1998-11-17
申请人： NIPPON KOKAN KK , SHINAGAWA REFRACTORIES CO
发明人： MURAKI YASUNORI , KURANAGA TAICHI , WATANABE KYOJI , KATO AKIRA , MORIWAKI MASAHIRO
IPC分类号： B22D11/10 , B22D41/50 , B22D41/54 , B22D41/60
摘要： PROBLEM TO BE SOLVED: To provide a nozzle for pouring molten metal, with which almost 100% of hole opening ratio can efficiently be obtd. without clogging the nozzle hole and the application is not limited, in the case of pouring the molten metal by opening a molten metal pouring hole after holding the molten metal in a molten metal vessel, such as tundish, for a specific time. SOLUTION: In the nozzle 1 for pouring the molten metal used in the case of pouring the molten metal by opening the molten metal pouring hole with a sliding plate 11 after holding the molten metal into the molten metal vessel for a specific time, a nozzle body 2 having the nozzle hole 3 for pouring the molten metal and also having a space part 4 formed at the outside of the nozzle hole and a heating part 5 having an exothermic body 6 inserted in the space part 4 and heating the nozzle body 2 by generating the heat in the exothermic body 6 by supplying the electric current thereto, are provided to shut off the heat transfer to the nozzle body 2 from the molten metal by heating the nozzle body 2 with the heating part 5.

4. 发明专利

JPH09279258A METHOD FOR AGGLOMERATING IRON-MAKING DUST 失效
公开(公告)号：JPH09279258A
公开(公告)日：1997-10-28
申请号：JP11838496
申请日：1996-04-16
申请人： NIPPON KOKAN KK
发明人： MURAKI YASUNORI , YAMAMOTO NAOKI , NIMURA YOICHI
IPC分类号： C22B1/14
摘要： PROBLEM TO BE SOLVED: To provide an agglomerating method of iron-making dust which is simple and dispense with a specific equipment. SOLUTION: (a) The iron-making dust containing a prescribed moisture and >=20wt.% Fe+FeO content is prepared. (b) The iron-making dust is heaped up so as to be the permeability of the air. (c) The heaped-up iron-making dust is held for a prescribed time in the atmosphere. Further, the prescribed moisture content in the heaped-up iron-making dust is desirable to be 5-40wt.% as the outer content to the dust. The bulk density of the heaped-up iron-making dust is desirable to be 0.1-3g/cm . The agglomerating time can be shortened by blowing the air at >=5l/min.ton (dust) into the iron-making dust from the bottom part of the heaped-up iron-making dust.

5. 发明专利

JPH0448018A METHOD FOR RAPIDLY ANALYZING PHOSPHORUS, SULFUR AND SILICON IN MOLTEN PIG IRON DURING REFINING BY ON-LINE PROCESS 失效
公开(公告)号：JPH0448018A
公开(公告)日：1992-02-18
申请号：JP15617590
申请日：1990-06-14
申请人： NIPPON KOKAN KK
发明人： ARAI MANABU , MURAKI YASUNORI , TSUJI TAKESHI
IPC分类号： G01N1/22 , C21C1/02 , C21C1/04 , C21C5/46 , F27D17/00 , G01N33/20
摘要： PURPOSE:To very rapidly and accurately obtain measured results by selectively analyzing only fine particles in dust generated from an apparatus for refining molten iron and calculating the amts. of P, S and Si in molten iron with calibration curves. CONSTITUTION:When a large amt. of waste gas generated at the time of removing P, S, Si, etc., in molten iron is discharged through a gas duct 2 and a dust collector, part of the gas is fed into a classifier 5 through a branch pipe 4 for collection and components passed through filters are introduced into an analyzer 6. In the classifier 5, five kinds of filters having 5-50mum pore diameters are used and only fine particles passed through the filters are analyzed. In the case of 5mum pore diameter and 10mum pore diameter, results very close to values on calibration curves are obtd.

6. 发明专利

JPH0211713A METHOD FOR MELTING CR ORE IN CONVERTER 失效
公开(公告)号：JPH0211713A
公开(公告)日：1990-01-16
申请号：JP16140288
申请日：1988-06-29
申请人： NIPPON KOKAN KK
发明人： MURAKI YASUNORI , TOYODA KOJI , HASEGAWA TERUYUKI
IPC分类号： C21C5/28
摘要： PURPOSE:To produce Cr-containing steel at low a cost by charging Cr ore on molten iron at early stage after starting oxygen blow at the time of decarbonized-refining into molten steel by oxygen-blowing in a converter charging the molten iron and executing smelting-reduction of the Cr ore at wiring point having high temp. with an oxygen top blowing lance. CONSTITUTION:The molten iron 11 executing pre-refining of desiliconization, dephosphorization, desulfurization, etc., after tapping from a blast furnace, is charged into the converter 10 and the oxygen is blown from the oxygen top blowing lance 12 while rotating the lance 12 with a rotating device 14 and C contained in the molten iron 11 is oxidized to decarbonize by slagless refining to refine into the molten steel. In this case, at the stage, when the C content in the molten iron is still high within at least 10min after starting oxygen blow, the Cr ore is charged on the molten iron 11 from an adding device 15 and the Cr ore having difficult-to-melt, is melted 16 in the firing point 20 having high temp., such as 2000-2800 deg.C at the tip part of the rotated lance 12. Further, Cr2O3 and FeO contained in the Cr ore are reduced with C in the molten iron 11 or CO generated with oxidization thereof and the Cr-containing steel is produced at low cost without using Fe-Cr.

7. 发明专利

JPS6431913A APPARATUS FOR OBSERVING FURNACE CONDITION IN CONVERTER 失效
公开(公告)号：JPS6431913A
公开(公告)日：1989-02-02
申请号：JP18731087
申请日：1987-07-27
申请人： NIPPON KOKAN KK
发明人： ODA MINORU , MIYAHARA HIROAKI , MURAKI YASUNORI , NARA MASATOSHI
IPC分类号： C21C5/46
摘要： PURPOSE:To directly measure slag foaming without delaying time by executing image pick-up to a steel tapping hole in a converter and the neighborhood thereof, displaying the image, image processing, analyzing brightness of the steel tapping hole and displaying the slag condition. CONSTITUTION:The image pick-up is executed to the steel tapping hole 3 and the neighborhood in the converter 1 during operation through an image pick-up device 10, and the image is displayed on a furnace condition display device 13 and also transmitted to the picture processor 11. The picture processor 11 transmits the signal to an arithmetic unit 12 and in there, the brightness of the steel tapping hole 3 is analyzed to find the brightness with the lapse of time and this result is displayed on the slag condition display device 14. By this method, the slag foaming condition in the furnace is directly and quantitatively grasped without delaying the time and development of slopping can be prevented.

8. 发明专利

JPS6415311A METHOD FOR PREDICTING SLOPPING IN CONVERTER 失效
公开(公告)号：JPS6415311A
公开(公告)日：1989-01-19
申请号：JP16888387
申请日：1987-07-08
申请人： NIPPON KOKAN KK
发明人： ODA MINORU , MIYAHARA HIROAKI , MURAKI YASUNORI
IPC分类号： C21C5/46
摘要： PURPOSE:To directly and quantitatively predict slopping in a converter without any delay by observing brightness of a steel tapping hole in the converter with a furnace condition displaying device, further finding brightness value, etc., of the steel tapping hole from an image pickup device and predicting development of the slopping by this value. CONSTITUTION:The picture at the steel tapping hole 3 and the neighborhood in the converter wit the image pickup device 10 is shown in the furnace condition displaying device 13. On the other hand, the arithmetic unit 12 analyzes the signal from a picture processor 11 and finds the brightness value of the steel tapping hole 3 or its variation at the lapse of time, and they are quantitatively displayed with the alarming device 14. Then, when their values come in the range which development of the slopping is possible, the device 14 gives the alarm on the display or sound. Further, the above range can be statistically found beforehand with an observing device 20 for furnace condition in the converter at each blowing condition.

9. 发明专利

JPS63235420A DEVICE FOR PREVENTING FLOW-OUT OF SLAG 失效
公开(公告)号：JPS63235420A
公开(公告)日：1988-09-30
申请号：JP6911087
申请日：1987-03-25
申请人： NIPPON KOKAN KK
发明人： MURAKI YASUNORI , KOBAYASHI SHUJI , TOYODA KOJI
IPC分类号： C21C5/46
摘要： PURPOSE:To efficiently prevent flow-out of slag into a ladle and to eliminate necessity of temp. raising of molten metal in a refining furnace by floating a stopper between the slag and the molten metal just at upper zone of a molten metal tapping hole, dipping a cylindrical member in the slag and holding the stopper to just the above upper zone by a connecting member. CONSTITUTION:At the time of tapping about 80% of the molten metal in the refining furnace, the slag 5 flow-out preventing device 10 composing of the stopper 20 having the intermediate specific gravity between the slag 5 and the molten metal 4 and the cylindrical member 30 having the specific gravity more than that of the slag 5 and less than that of the stopper 20 and chain 40 on the slag 5 just at the upper zone of the molten metal taping hole 6. Under this condition, even in case further the molten metal 4 is flowed out and the molten surface is descended and vortex is developed, the flow-in of the slag 5 at outside of the member 30 into the tapping hole 6 is prevented, and the vortex is reduced in its speed. Further, at the time of flowing out the molten metal 4 and substantially remaining only the slag, the stopper 20 closes the tapping hole 6, to prevent the flow-out of the slag 5. Then, as the stopper 20 is connected with the member 30 by the chain 40, the tapping hole 6 is surely closed to profitably prevent the flow-out of the slag 5.

10. 发明专利

JPS63103019A REFINING METHOD BY BLOWING IN CONVERTER 失效
公开(公告)号：JPS63103019A
公开(公告)日：1988-05-07
申请号：JP24901586
申请日：1986-10-20
申请人： NIPPON KOKAN KK
发明人： MURAKI YASUNORI , TANABE HARUYOSHI , KAWAKAMI MASAHIRO , FUKUMI JUNICHI
IPC分类号： C21C5/32
摘要： PURPOSE:To inhibit the foaming and spouting of slag floating on molten steel in a converter during refining with blown oxygen by blowing a gas on the slag to agitate the slag. CONSTITUTION:A lance 12 is put in a converter 11 from the top opening and a jet of oxygen is blown on molten steel 14 from the tip of the lance 12 to refine the molten steel 14. At the same time, gaseous Ar is jetted from nozzles 13 fitted to the peripheral wall of the lower part of the lance 12 to agitate slag 15 floating on the molten steel 14. The slag 15 is prevented from undergoing local excessive oxidation and the foaming of slag is inhibited.

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