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91. 发明专利

JPS5145612A TAIKOONWARE OOSUTENAITOSUTENRESUKO 失效
公开(公告)号：JPS5145612A
公开(公告)日：1976-04-19
申请号：JP11959374
申请日：1974-10-16
申请人： SUMITOMO METAL IND
发明人： HASEBE SHIGEO , KOIZUMI ISAMU , ABAI TAKASHI , NAKAI TAKESHI
IPC分类号： C22C38/00 , C22C38/48

92. 发明专利

JPH0620617B2 失效
公开(公告)号：JPH0620617B2
公开(公告)日：1994-03-23
申请号：JP249289
申请日：1989-01-09
申请人： SUMITOMO METAL IND
发明人： KAWAMOTO MASAYUKI , NAKAI TAKESHI , KANAZAWA TAKASHI
IPC分类号： B22D11/07 , B22D11/00 , B22D11/10 , B22D11/108 , B22D11/111

93. 发明专利

JPH05138320A METHOD FOR POURING MOLTEN METAL INTO MOLD FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH05138320A
公开(公告)日：1993-06-01
申请号：JP35550391
申请日：1991-11-20
申请人： SUMITOMO METAL IND
发明人： KANAZAWA TAKASHI , NAKAI TAKESHI
IPC分类号： B22D11/10 , B22D11/103 , B22D11/114 , B22D11/115 , B22D11/16 , B22D11/18
摘要： PURPOSE:To prevent the clogging of an immersion nozzle by conducting electric current into a control coil provided near a suction hole of the immersion nozzle and holding molten metal stream with the generated electromagnetic force. CONSTITUTION:Induction current generated by conducting the electric current is caught with a transmitting coil 10 and a receiving coil 11 embedded near the suction hole and at the lower part in the immersion nozzle 4, the conductive current into the control coil 7 so as to keep gap between the molten metal stream near the suction hole and the inner wall of the nozzle to the suitable range. Then, by action of the electromagnetic force generated with this current conduction, the molten metal stream near the suction hole is suitably kept. By this method, the clogging of the immersion nozzle can be prevented.

94. 发明专利

JPH04143047A METHOD FOR HEATING MOLTEN METAL VESSEL 失效
公开(公告)号：JPH04143047A
公开(公告)日：1992-05-18
申请号：JP26588090
申请日：1990-10-03
申请人： SUMITOMO METAL IND
发明人： SHIRAI YOSHIHISA , KAJIWARA KOJI , NAKAI TAKESHI
IPC分类号： B22D11/10 , B22D41/015
摘要： PURPOSE:To make it unnecessary to replace the atmosphere of the subject vessel with inert gas after completing heating and to prevent temp. dropping by enriching the content of oxygen in air for combustion and specifying air ratio before pouring molten metal in a molten metal vessel. CONSTITUTION:The molten metal vessel 7 is heated with two burners 1 from upper part and flames 5 generated from the burners 1 are discharged as exhaust gas 10 from a part 12 to which the molten metal is poured from a ladle and nozzles 8. Mixed gas of fuel gas 2, air 3 and oxygen 4 is supplied to the burners 1. Oxygen in the air for combustion is enriched in content to increase the oxygen concn. and the fuel gas 2 is burnt at 0.7-0.98 air ratio. By this method, the molten metal vessel can be heated to high temp. and can be kept to low oxygen concn. atmosphere.

95. 发明专利

JPH0335853A METHOD OF PREVENTING INNER CRACK IN CAST SLAB IN CONTINUOUS CASTING 失效
公开(公告)号：JPH0335853A
公开(公告)日：1991-02-15
申请号：JP16885989
申请日：1989-06-30
申请人： SUMITOMO METAL IND
发明人： KANAZAWA TAKASHI , KAWASHIMA JUICHI , NAKAI TAKESHI , KAJIWARA KOJI
IPC分类号： B22D11/128 , B22D11/16 , B22D11/20
摘要： PURPOSE:To prevent the development of inner crack in a cast slab while keeping pass line at center part of the cast slab and the cast slab thickness constant by arranging rolling reduction device to pinch rolls and on the other hand, and detecting bending of the pinch roll to adjust the rolling reduction device. CONSTITUTION:The rolling reduction device 2 is arranged to one pair of the pinch rolls 1 set in continuous casting line. The bending of pinch roll 1 is detected with a displacement gage 3 and based on this bending direction and bending rate, the rolling reduction device 2 is adjusted. Further, the bending of pinch roll 1 is detected with the displacement gage 3 as the above, and also the displacement of roll chock 22 is detected with an optical type displacement measuring instrument 8 to obtain the variation of the pass line and based on the bending direction and bending rate of the pinch roll 1 and the variation of pass line, the rolling reduction device 2 is adjusted. The displacement gage 3 measures at least three points the width direction of cast slab 5, it is decided whether the roll bending is developed or not with computing element 6.

96. 发明专利

JPH02251347A METHOD FOR PREVENTING DEPOSIT OF STICKING MATERIAL INTO SUBMERGED NOZZLE 失效
公开(公告)号：JPH02251347A
公开(公告)日：1990-10-09
申请号：JP6442189
申请日：1989-03-16
申请人： SUMITOMO METAL IND
发明人： KAWAMOTO MASAYUKI , NAKAI TAKESHI , NOSHIRO KIYOSHI
IPC分类号： B22D11/10 , B22D41/54
摘要： PURPOSE:To reduce occurrent ratio of nozzle clogging by forming a submerged nozzle of solid electrolyte, acting potentials of positive and negative at inner and outer walls thereof, respectively to form oxygen pump and forming FeO film on the inner wall surface. CONSTITUTION:The submerged nozzle 4 is connected with a molten steel discharge hole at bottom wall in a tundish through a sliding nozzle. A part or the whole of this submerged nozzle 4 is formed of the solid electrolyte 1. Then, the positive potential at the inner wall side and the negative potential at the outer wall side in the submerged nozzle 4 are acted to form the oxygen pump. By this method, the oxygen concn. at the inner wall side in the submerged nozzle 4 is risen to form the FeO film on the inner wall surface of the submerged nozzle 4. Then, deposition of alumina, etc., on the inner wall surface in the submerged nozzle can be eliminated.

97. 发明专利

JPH02220747A METHOD FOR LUBRICATING MOLD IN CONTINUOUS CASTING 失效
公开(公告)号：JPH02220747A
公开(公告)日：1990-09-03
申请号：JP3971589
申请日：1989-02-20
申请人： SUMITOMO METAL IND
发明人： YAMANAKA AKIHIRO , NAKAI TAKESHI
IPC分类号： B22D11/07
摘要： PURPOSE:To eliminate breakout and to secure the stable workability by providing a feeding passage for slag series lubricator having electric conductive inner wall face in a mold part, setting a non-consumable electrode in the feeding passage, energizing to it and supplying the lubricator while keeping the lubricator to liquid-state. CONSTITUTION:At the time of introducing the slag series lubricator under molten or semi-molten state in the lubricator feeding passage 3, the electric conductivity is secured between the non-consumable electrode 9 and the inner wall face 4 of the lubricator feeding passage. At the time of giving potential difference between both with an electric source 10, the current is made flow through the lubricator and Joule heat is generated with resistance of the lubricator. By this Joule heat, the temp. lowering of the molten-state slag series lubricator is restrained and even the semi-molten state lubricator perfectly goes to the molten-state and the sufficient fluidity is kept. By this method, the lubricator can be smoothly supplied between the mold and the cast slab surface, and uniform lubricating film can be formed, and the workability and the cast slab quantity are improved.

98. 发明专利

JPH01210157A METHOD FOR PREVENTING SURFACE LONGITUDINAL CRACK ON CONTINUOUS CAST SLAB 失效
公开(公告)号：JPH01210157A
公开(公告)日：1989-08-23
申请号：JP3206388
申请日：1988-02-15
申请人： SUMITOMO METAL IND
发明人： KANAZAWA TAKASHI , NAKAI TAKESHI , SEKINO KAZUTO
IPC分类号： B22D11/10 , B22D11/108 , B22D11/111
摘要： PURPOSE:To surely prevent longitudinal crack on slab surface by adding exothermic powder developing exothermic reaction by melting with molten steel in the initial stage of casting on the molten steel surface in a mold at the time of continuously casting the medium carbon steel slab having the specific C content range. CONSTITUTION:In the initial stage of the casting at the time of continuously casting the medium carbon steel containing 0.09-0.15wt.% C, the exothermic powder as replacing with the ordinary mold powder is added on the molten steel surface in the mold. The exothermic powder is desirable to be one having >=5kcal/g calorific value and at the time of melting on the molten steel, the exothermic reaction is generated with thermit reaction and the powder becomes high temp. state and is rapidly melted. Then, molten powder having high fluidity is flowed on the whole range to width direction of the mold. Therefore, temp. at each part is raised and also temp. distribution to the width direction is uniformized because of the good fluidity thereof. By this method, the longitudinal crack caused by relative lowering the molten steel temp. at center part in the width direction, is surely prevented. Further, the above-mentioned exothermic powder is used to the one having, for example, the composition shown in the table.

99. 发明专利

JPS6440143A CONTINUOUS CASTING METHOD FOR SOUND CAST SLAB 失效
公开(公告)号：JPS6440143A
公开(公告)日：1989-02-10
申请号：JP19528187
申请日：1987-08-06
申请人： SUMITOMO METAL IND
发明人： NAKAI TAKESHI
IPC分类号： B22D11/04 , B22D11/041 , B22D11/055
摘要： PURPOSE:To uniformize thickness of solidified shell of a cast slab and to reduce frequency of development of crack at the time of solidification by reducing conductive heat in the cooling range of long side wall of a mold at the specific quantity. CONSTITUTION:The continuous casting mold, which the conductive heat at a part of

100. 发明专利

JPS63180347A WATER-COOLED CASTING MOLD FOR CONTINUOUS CASTING 失效
公开(公告)号：JPS63180347A
公开(公告)日：1988-07-25
申请号：JP1463287
申请日：1987-01-23
申请人： SUMITOMO METAL IND
发明人： NAKAI TAKESHI , MAEHARA YASUHIRO
IPC分类号： B22D11/04 , B22D11/059
摘要： PURPOSE:To permit continuous production of a high-quality slab having decreased surface cracks by diffusively joining a two-phase stainless steel having superplasticity to the inside peripheral wall surface of a water-cooled casting mold within a specific range from the top end of the wall surface so that an initially solidified shell is slowly formed. CONSTITUTION:The two-phase stainless steel 4 which has the lower heat conductivity than copper and has the superplasticity is diffusively joined to the inside peripheral wall surface of the water-cooled casting mold 2 for continuous casting of steel consisting of water-cooled copper plates 5 provided with cooling water paths 6, within the 200mm range from the top end of the above-mentioned wall surface. The adequate thickness of the above-mentioned two-phase stainless steel 4 is about 2-5mm and said stainless steel can be diffusively joined easily to the above-mentioned copper plate 5 at a relatively low temp. of about 750-1,100 deg.C under about 0.5-10kgf/mm pressurizing force. Heat extraction near the meniscus of the molten steel 1 in the casting mold 2 is thereby controlled so that the initially solidified shell 3 is slowly formed. The solidified shell 3 increases its thickness successively as the shell is drawn. The high-quality slab is thus obtd.

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