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1. 发明专利

JPH0245110B2 失效
公开(公告)号：JPH0245110B2
公开(公告)日：1990-10-08
申请号：JP12269287
申请日：1987-05-21
申请人： KAWASAKI STEEL CO
发明人： WATANABE SEIJI , SAITO MITSUO , NANBA AKIHIKO , FUJII TETSUYA , NOZAKI TSUTOMU
IPC分类号： F27D1/16

2. 发明专利

JPH0241747A LEADING TUBE FOR MOLTEN METAL 失效
公开(公告)号：JPH0241747A
公开(公告)日：1990-02-09
申请号：JP19264688
申请日：1988-08-03
申请人： KAWASAKI STEEL CO
发明人： TOZAWA KOICHI , SAITO MITSUO , BESSHO NAGAYASU , FUJII TETSUYA
IPC分类号： B22D11/10 , B22D41/50
摘要： PURPOSE:To drastically reduce frequency of nozzle clogging by arranging one or more spiral steps on inner wall in the nozzle for continuous casting and gradually reducing cross sectional area of molten metal flowing passage from inlet side to outlet side. CONSTITUTION:In the nozzle cross section in the case of three for the number of spirals, the spiral steps 2 are arranged in the inner face of a nozzle main tube part 1 and the molten metal flowing passage 4 is formed to discharge the molten metal from the discharging hole 3. By winding a plate ABC of right-angled triangle having thickness (t), height (h) and length (l) of the base as tubular from a while aligning the base AB, one piece of the spiral is obtd. The (n) pieces of the spirals are obtd. similarly. The strong circular movement is given to molten steel flow at the inlet of the nozzle and since sp. gr. of Al2O3 inclusion produced at the time of deoxidizing the molten steel is smaller than the sp. gr. of the molten steel, the Al2O3 inclusion is separated from the nozzle wall with centripetal force during circulation in the nozzle. Further, by strong circular flow, the boundary layer in the vicinity of the nozzle wall is broken, and washing effect is developed. In such a manner, the frequency of the nozzle clogging can be drastically reduced.

3. 发明专利

JPH021883B2 失效
公开(公告)号：JPH021883B2
公开(公告)日：1990-01-16
申请号：JP10178182
申请日：1982-06-14
申请人： KAWASAKI STEEL CO
发明人： SAITO MITSUO , SHINTANI HIROTAKA
IPC分类号： C21B7/06

4. 发明专利

JPH01132744A METHOD FOR REPAIRING NOZZLE FOR CASTING OF MOLTEN METAL 失效
公开(公告)号：JPH01132744A
公开(公告)日：1989-05-25
申请号：JP28856687
申请日：1987-11-17
申请人： KAWASAKI STEEL CO
发明人： WATANABE SEIJI , SAITO MITSUO , NANBA AKIHIKO , FUJII TETSUYA
IPC分类号： C23C4/02
摘要： PURPOSE:To obviate the exfoliation of a repair layer and to repair the title nozzle of a carbon-contg. material with good durability in repair of said nozzle by thermally spraying a refractory material to the surface of the nozzle which is burned away of the carbonaceous component in the surface layer part. CONSTITUTION:A refractory compsn. is welded by a flame thermal spraying repair method to the eroded outside circumferential part of the nozzle made of the carbon-contg. material for casting of metals. The surface of said nozzle is heated by the flame heat generated by a combustible gas and combustion supporting gas to melt away the slag sticking to the surface and further, the heating by said flame is continued to burn away the carbonaceous component on the nozzle surface. The state of projecting the refractory aggregate in the nozzle compsn. is maintained and in succession, the refractory material powder for repair is supplied into said flame to form the refractory deposition layer.

5. 发明专利

JPS63130244A PRODUCTION OF CLADDING INGOT 失效
公开(公告)号：JPS63130244A
公开(公告)日：1988-06-02
申请号：JP27645586
申请日：1986-11-21
申请人： KAWASAKI STEEL CO
发明人： SAITO MITSUO , KITAOKA HIDENARI , NANBA AKIHIKO , NOZAKI TSUTOMU
IPC分类号： B22D19/16 , B22D7/02
摘要： PURPOSE:To easily change of cladding ratio and to produce a cladding ingot without detaching at a solidified boundary face between a core material and molten metal by installing a mold as inclining and making the mold horizontal after the casting is completed. CONSTITUTION:The core material 2 having the prescribed dimension, and coating facing material 3 for surface oxidizing, is fixed to frame 6 near the bottom part of mold 1. Next, after inclining the mold 1 at the prescribed angle by a mold lifting device 8, the molten steel 4 for enclosing a cast-in material is poured from a pouring tube 7 for bottom casting. After the pouring of molten steel 4 having the prescribed cladding ratio is completed or after the core material 2 is covered by the molten steel 4, the mold 1 is made to horizontal state by the mold lifting device 8, and the molten steel is solidified. In this way, scum floating on the molten surface is difficult to enclose in the steel, and as the scum is not trapped on the surface of core material, the ingot having the optional cladding ratio without detaching at the solidified boundary face between the core material 2 and the molten steel 4 is obtd.

6. 发明专利

JPS62280574A SMELTING VESSEL FOR MOLTEN METAL 失效
公开(公告)号：JPS62280574A
公开(公告)日：1987-12-05
申请号：JP12019586
申请日：1986-05-27
申请人： KAWASAKI STEEL CO
发明人： SAITO MITSUO , ONUMA KEIMEI , SAKURATANI TOSHIKAZU , SUMITA NORIO , NOZAKI TSUTOMU
IPC分类号： F27B14/00 , C22B9/00 , F27B14/10

7. 发明专利

JPS6264470A BLOCKAGE PREVENTING METHOD FOR MOLTEN STEEL PASSAGE 失效
公开(公告)号：JPS6264470A
公开(公告)日：1987-03-23
申请号：JP20351685
申请日：1985-09-17
申请人： KAWASAKI STEEL CO
发明人： FUJII TETSUYA , BESSHO NAGAYASU , SAITO MITSUO , WATANABE SEIJI , NOZAKI TSUTOMU
IPC分类号： B22D11/10 , B22D11/115 , B22D41/08 , B22D41/50
摘要： PURPOSE:To prevent the adhesion of the nonferrous inclusion in the molten steel to the passage wall and to stabilize casting operation by providing a magnetic field generating device around the passage made of reflactories through which the molten steel is circulated and by causing rotary movement to the molten steel with the action of magnetic force. CONSTITUTION:The casting is performed by pouring a molten steel 5 into a mold 2 via the nozzle 3 made of fireproof materials from a tandish 1. In this case, a rotary magnetic field generating device 4 is set up on the outer peripheral part of a dipping nozzle 3 to act the magnetic field on the molten steel 5 which flows down inside the nozzle 3 and the cause rotary movement on the molten steel 5. It is optimum to use the double pole type using three phase alternating current for the rotary magnetic field generating device 4 and the magnetic field intensity thereof is taken about 500 gauss at the center part of the nozzle 3. The adhesion of the inclusion (main components are Al2O3, SiO2) in the molten steel 5 is thus prevented effectively to perform the casting stably.

8. 发明专利

JPH03161152A NOZZLE FOR CASTING 失效
公开(公告)号：JPH03161152A
公开(公告)日：1991-07-11
申请号：JP29967789
申请日：1989-11-20
申请人： KAWASAKI STEEL CO
发明人： WATANABE SEIJI , SAITO MITSUO , TANMACHI KENICHI , SAKURATANI TOSHIKAZU
IPC分类号： B22D11/10 , B22D41/54 , C04B35/16
摘要： PURPOSE:To reduce nozzle clogging and to improve stable operation and the productivity by setting burnt refractory composed of the specific quantities of zircon, silica and alumina to inner circumferential wall face in the nozzle. CONSTITUTION:The burnt refractory composed of composition of 40-80wt.% zircon (ZrO2.SiO2), 10-40% silica and 10-20% alumina, is set at the inner circumferential wall face in the nozzle. The burnt refractory is applied to a short nozzle 3 at lower part of a sliding nozzle 2 in a tundish 1. A cylindrical body is formed with the refractory 6 having the above composition and fitted to inner face of the short nozzle 3 by using refractory mortar. In this result, the eroded rate is a little and the thickness of stuck materials, the developing velocity of the stuck material is made to about 1/4 the velocity in the conventional nozzle material. By this method, in continuous casting for steel, particularly for aluminum killed steel, the nozzle clogging at the time of sequential continuous casting is reduced, and the stable operation and the productivity can be improved.

9. 发明专利

JPH026371A PRODUCTION OF SILICON CARBIDE BRICK HAVING SIALON LINKAGE 失效
公开(公告)号：JPH026371A
公开(公告)日：1990-01-10
申请号：JP15492788
申请日：1988-06-24
申请人： KAWASAKI STEEL CO
发明人： SAITO MITSUO , WATANABE SEIJI , NANBA AKIHIKO , FUJII TETSUYA
IPC分类号： C04B35/565 , C04B35/56
摘要： PURPOSE:To obtain the title brick excellent in heat shock resistance with little change in volume and physical properties in an oxidative or reducive atmosphere by press forming of a mixture comprising SiC aggregate, metallic Si powder and metallic Al powder followed by sintering in a N2 atmosphere. CONSTITUTION:Firstly, 100 pts.wt. of silicon carbide aggregate is homogeneously mixed with 15-20 pts.wt. of a blend comprising 67.5-88.8wt.% of metallic silicon powder, 3.4-8.5wt.% of metallic aluminum powder and 3-24wt.% of aluminum oxide powder. Thence, the resultant mixture is put to press forming and sintered in a nitrogen atmosphere at 1300-1500 deg.C thus obtaining the objective brick. The sintering atmosphere is required to be a nitrogen one in order to develop SIALON linkage during the sintering process. If 1500 deg.C, SIALON is rapidly formed on the surface of the sintered form to effect densification of said form; hence, a nitrogen gas cannot diffuse deep into the sintered form, therefore being unfavorable.

10. 发明专利

JPS63267886A FLAME SPRAYING REPAIR METHOD OF REFRACTORY 失效
公开(公告)号：JPS63267886A
公开(公告)日：1988-11-04
申请号：JP12269287
申请日：1987-05-21
申请人： KAWASAKI STEEL CO
发明人： WATANABE SEIJI , SAITO MITSUO , NANBA AKIHIKO , FUJII TETSUYA , NOZAKI TSUTOMU
IPC分类号： F27D1/16

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