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1. 发明专利

JPS62296941A PRODUCTION OF HOLLOW METALLIC INGOT 失效
公开(公告)号：JPS62296941A
公开(公告)日：1987-12-24
申请号：JP14027986
申请日：1986-06-18
申请人： KAWASAKI STEEL CO
发明人： SAITO KENJI , OGUCHI MASAO , KATO TOSHIO , OZU SHUJI , AIZAWA KANJI , YAO SHO
IPC分类号： B22D7/04
摘要： PURPOSE:To safely produce a good-quality ingot providing a cylindrical grating type buckling adjusting flask to the inside of a cylindrical metallic core in the central part of a casting mold and blowing an inert gas during casting and water or gas-mixed mists after buckling of the core from a central cooling nozzle. CONSTITUTION:The cylindrical grating type buckling adjusting flask 7 having 5-50mm spaces to prevent the generation of shell cracking is disposed to the inside of the cylindrical metal core 6 disposed to the central part of the casting mold 2. The inert gas is blown to the metallic core 6 from the central cooling nozzle 8 during casting to permit the free shrinkage, on cooling, to the formed shell by the buckling of the metallic core 6, thereby preventing the generation of the surface cracking. The water or the water-gas mixed mists are blown to cool and strengthen the shell during the growth of the casting, by which the generation inverted V segregation is prevented and the buckling deformation is maintained within the specified value. The generation of the internal shell cracking and leakage of the molten steel are thus prevented. The ingot having the good quality without having cracks is thus formed and the hollow ingot is safely produced without the possibility of a steam explosion.

2. 发明专利

JPS6393831A ELECTROSLAG REMELTING METHOD 失效
公开(公告)号：JPS6393831A
公开(公告)日：1988-04-25
申请号：JP23741886
申请日：1986-10-06
申请人： KAWASAKI STEEL CO
发明人： OZU SHUJI
IPC分类号： C22B9/18 , C22B9/187
摘要： PURPOSE:To control the melting speed in an electrode with high accuracy and to permit production of a high-quality steel ingot, by measuring the weights of a molten steel, steel ingot, casting mold and stool, etc., simultaneously during remelting, detecting the deviation between the melting weight and set weight and controlling electric power for melting. CONSTITUTION:The weights of the molten steel 8 melted from the electrode 4 and the steel ingot 10 are necessary. Since the independent measurement of said weights is difficult, the molten steel 8, the steel ingot 10, molten slag 6, the casting mold 2 and the stool 14, etc., are simultaneously measured by a weight measuring instrument 16. The connection of attachments such as cooling pipings to the mold 2 and the stool 14, etc., are so considered that the weights thereof are not loaded on the mold and stool, etc. Only the weight of the molten steel 8 and the steel ingot 10 change during melting. A weight deviation calculating circuit 20 is inputted with the measured weight signal from the instrument 16 and the set weight signal from a set weight circuit 18 and calculates the output increase or decrease signal from the deviation between the two signals. The signal is inputted to an electric power control circuit 22 which in turn controls the throwing melting power to be impressed to the electrode 4. The electrode 4 is automatically moved upward and downward and such operations are repeated.

3. 发明专利

JPS6320152A METHOD AND APPARATUS FOR PRODUCING INGOT 失效
公开(公告)号：JPS6320152A
公开(公告)日：1988-01-27
申请号：JP16609786
申请日：1986-07-15
申请人： KAWASAKI STEEL CO
发明人： AIZAWA KANJI , TAKASHIBA NOBUMOTO , KOJIMA SHINJI , OZU SHUJI
IPC分类号： B22D27/06 , B22D7/10
摘要： PURPOSE:To prevent molten slag and molten steel from flowing in a gap between a mold and a solidified shell contacting with the mold and at the same time to reduce the development of shrinkage hole by executing effectively the heat insulation of the top part of ingot, by arranging a frame submerged into the molten steel at its lower part on the upper part of mold and supplying energy to the molten slag. CONSTITUTION:The molten steel 8 is poured into the mold 4 and the molten slag is charged on the molten steel 8, and the energy is supplied on the molten slag 12 through consumable electrodes 16, to produce the ingot. As the frame 32 submerged into the molten steel 8 at its lower part is arranged in the inside at the upper part of mold 4, the molten steel invading in the gap between the mold 4 and the frame 32 is cooled mainly by the mold 4, and the solidified shell 10A is rapidly formed and also by integrating with the solidified shell 10 solidifying at the outer inner face of the mold 4, the solidified vessel, which is full of the molten steel 8, is formed. And, even after developing the gap 46 between the mold 4 and the solidified shell by shrinkage of the solidified shell 10, 10A, the molten steel 8 is not flowed in the gap 46 by overflowing the rim of solidified shell 10, to keep the pool shape of molten steel 8 flatness.

4. 发明专利

JPS63264262A PRODUCTION OF GRAIN ORIENTED SOLIDIFIED INGOT 失效
公开(公告)号：JPS63264262A
公开(公告)日：1988-11-01
申请号：JP9814587
申请日：1987-04-21
申请人： KAWASAKI STEEL CO
发明人： OZU SHUJI
IPC分类号： B22D27/06 , B22D23/10 , B22D27/02 , C22B9/16
摘要： PURPOSE:To prevent condensed segregation and reverse V segregation by charging molten slag on the molten steel surface, dipping electrodes is molten slag while keeping apart from another electrode by more distance than radius of the electrode, conducting the current, heating and solidifying from the bottom part. CONSTITUTION:The molten steel 6 is poured into a mold 4 set on a base plate 2 and the molten slag 8 is charged on the surface of the molten steel 6. After charging the molten slag 8, two electrodes for remelting are dipped. The distance between electrodes 10 is made to be more than the radius of electrode 10, in order to prevent arc between the electrodes or the mold 4 and electrodes, and induce suitable slag flowing around the electrodes 10. The prescribed power is conducted in order to induce the suitable slag 8 flowing and melt the electrodes 10. By occurring a flow of molten slag 8 around the electrodes 10, uniformly heating the top part of molten steel 6 and executing grain oriented solidification, the reverse V segregation at the side face is prevented, and condensing of the molten steel is diluted at the top part and the grain oriented solidified ingot having only a little cut-off part is obtd.

5. 发明专利

JPS63262429A MANUFACTURE OF ELECTRODE FOR ELECTROSLAG REMELTING 失效
公开(公告)号：JPS63262429A
公开(公告)日：1988-10-28
申请号：JP9814487
申请日：1987-04-21
申请人： KAWASAKI STEEL CO
发明人： OZU SHUJI
IPC分类号： C22B9/18 , C22B9/187
摘要： PURPOSE:To manufacture the titled electrode capable of surely connecting to a stub without using machining, by molding a mold which has a groove and to which an electrifying ring made of iron is fitted and by carrying out casting by combining this mold, a stool equipped with a runner and a top hole, and a mold. CONSTITUTION:A mold 14 forming a groove 6 of an electrode 2 for electroslag remelting is previously molded by using sand, refractories, etc., and an electrify ing ring 16 made of iron is fitted to the part to be held between the electrode 2 and a flange 8 at the time of connection to a stub 4. Further, it is necessary that this iron ring 16 is >=about 5mm thick and has smooth surface. Subsequent ly, this mold 14 is integrated with a surface plate 20 fitted with a runner 17 and a top hole 18, which is combined with a mold 22. Then, a molten metal is poured via the runner 17 and the top hole 18 into the mold 22 so as to cast the electrode 2. By this method, the electrode 2 can be fastened to the stub 4 via the flange 8 by means of a bolt 10 while obviating the necessity of work ing, and the iron ring 16 is welded to the electrode 2 on one side and also is connected to the flange 8 on the other side.

6. 发明专利

JPH0252146A METHOD FOR CASTING STEEL INGOT HAVING PRESCRIBED WEIGHT 失效
公开(公告)号：JPH0252146A
公开(公告)日：1990-02-21
申请号：JP20266088
申请日：1988-08-16
申请人： KAWASAKI STEEL CO
发明人： OZU SHUJI
IPC分类号： B22D7/00 , B22D7/06
摘要： PURPOSE:To cast a steel ingot having the prescribed wt., to improve the yield and to reduce spare ingots by independently pressurizing molten steel surface in each mold with inert gas, to each ingot to enable adjustment of the pressure at the time of casting the ingots with bottom pouring by using plural molds on the same surface plate. CONSTITUTION:Upper part of the mold 1(2) is covered with a cover 6 and seal 12, and closed space above the molten steel surface in the mold 1(2) needing to the low height ingot is pressurized with the inert gas 9. Then, at the time of using H1 for difference of the heights between the highest molten steel 2 surface and the low objective molten steel 2 surface, the relation of the pressure P on the molten steel surface of the objective ingot 2 and H1 is as the equation. By applying the above method, for example, in the plant of 10,000T/month of casting ingot production, the spare ingot can be reduced from 1,000T/month to 600T/month. Further, in the figure, 4 : runner, 5 : pouring tube 10 : pressure adjusting valve are shown, respectively.

7. 发明专利

JPH01178352A METHOD FOR CONTINUOUSLY CASTING SLAB 失效
公开(公告)号：JPH01178352A
公开(公告)日：1989-07-14
申请号：JP254788
申请日：1988-01-11
申请人： KAWASAKI STEEL CO
发明人： MATSUKAWA TOSHITANE , KOJIMA SHINJI , OZU SHUJI
IPC分类号： B22D11/10 , B22D11/04 , B22D11/103
摘要： PURPOSE:To enable continuous casting without lowering the productivity of narrow width slab with the min. reconstruction of equipment by arranging two tundish nozzles and separately one more tundish nozzle at near the center side in the adjoining three strands of the narrow width molds. CONSTITUTION:The tundish nozzles 3a and 4a arranged at span (l) for using at the time of casting with two strands of wide width molds are used as they are. At the same time, among the narrow width twin molds 7 and 8 for four strands, for example, the narrow width mold 8B at one end of the mold 8 is stopped and the tundish nozzle 3b is used, and as the adjoining narrow width molds 7A, 7B and the other side narrow width mold 8A are poured, the continuous casting can be executed without changing the length L of the tundish. As need of the reconstruction is only arrangement of the tundish nozzle 5b, the reconstruction cost can be lowered.

8. 发明专利

JPS62267046A METHOD AND APPARATUS FOR PRODUCING HOLLOW METALLIC INGOT 失效
公开(公告)号：JPS62267046A
公开(公告)日：1987-11-19
申请号：JP11119686
申请日：1986-05-15
申请人： KAWASAKI STEEL CO
发明人： SAITO KENJI , OGUCHI MASAO , KATO TOSHIO , OZU SHUJI , AIZAWA KANJI , YAO SHO
IPC分类号： B22D7/04 , B22D27/04
摘要： PURPOSE:To obtain the large hollow steel ingot having no surface crack and good inner quality by blowing directly coolant gas on the inner face of a core as permissible to buckling of the core at the time of solidifying as cooling molten steel poured between a mold and the metallic cylindrical core. CONSTITUTION:The core 4 has a constitution, in which a cooling gas is blown from a blowing nozzle 8 at circumference of a cooling gas vessel 9 to the metallic cylinder 6 through a space opening 7a of a buckling adjusting frame 7, as forming gap G between the cylinder 6 and the cylindrical grid shaped buckling adjusting frame 7 as a buckling room. At the time of casting, the core 4 is laid at center part of a polygonal ingot mold 2 having corrugated shape in each side on a base plate 1 and the molten steel is poured into a casting space S from a rising gate 5 through a runner 3 as blowing the cooling gas supplied from the gas vessel 9 to the cylinder 6, to solidify. In this away, the large hollow steel ingot having no surface crack and a little inner inversed V segregation is produced.

9. 发明专利

JPS63180362A METHOD AND APPARATUS FOR PRODUCING STEEL INGOT 失效
公开(公告)号：JPS63180362A
公开(公告)日：1988-07-25
申请号：JP1359487
申请日：1987-01-23
申请人： KAWASAKI STEEL CO
发明人： AIZAWA KANJI , KOJIMA SHINJI , TAKASHIBA NOBUMOTO , MATSUKAWA TOSHITANE , OZU SHUJI
IPC分类号： B22D7/00 , B22D27/06
摘要： PURPOSE:To produce an ingot having beautiful surface condition and no defect, such as shrinkage hole, in inner part thereof, by arranging a circular frame at inner face of upper part of a mold of a mold at the time of casting molten steel in the mold by electro-slag hot-top method and sealing gap between the lower part thereof and the mold. CONSTITUTION:The circular frame 32 composing of a frame 34 and refractory heat- resistant made lining 36 at upper part of the mold 4 and unifying with solidified shell 10 forming in inner face of the mold 4 at the time of casting the molten steel 8 in the mold 4, is fitted. The molten steel 8 is cast in the mold 4 and to molten slag 12 on it,electric current is conducted by a consumable electrode 16 composing of the same material as the molten steel 8 and feeder head part at upper part of the molten steel 8 is heated by resistant heat of the molten slag 12 to keep the molten state. In this case, the sealing material 38, such as sand, is packed between the above circular frame 12 and the mold 4, to prevent the molten slag 12 and the molten steel 8 in the frame 32 from cooling. As the molten slag 12 or the molten steel 8 are not flowed in gap 40 between the solidified shell 10 developed in the molten steel 8 poured in the mold 4 and the inner face of the mold 4, the steel ingot without developing shrinkage hole by heat insulating effect for the molten slag 12 is obtd.

10. 发明专利

JPS6313659A MANUFACTURE OF STEEL INGOT 失效
公开(公告)号：JPS6313659A
公开(公告)日：1988-01-20
申请号：JP15512386
申请日：1986-07-03
申请人： KAWASAKI STEEL CO
发明人： SAITO KENJI , SHINJO YUTAKA , KINOSHITA KATSUO , OGUCHI MASAO , OZU SHUJI
IPC分类号： B22D27/06 , B22D23/10 , B22D27/02
摘要： PURPOSE:To prevent the erosion of a feeding head sleeve brick and to prevent the penetration of the molten steel of the feeding head part into the gap caused between a mold and steel ingot by arranging the sleeve protection ring dipping its lower part into a melted slug at the inner side of the feeding head sleeve brick. CONSTITUTION:After pouring a molten steel 7 a molten slug 8 is added thereon, the lower end part of an electrode 6 is dipped into the slug 8 and with its electrification the slug 8 is heated and subjected to a heat insulation. The molten slug located on the molten steel is easily penetrated into the gap of the sleeve brick 4 and ring 5. The slug located in the gap of the sleeve brick 4 and ring 5 is cooled by the both parts of the brick 4 and ring 5 besides having no flow, reaching to be solidified. The slug 8 coming into contact with the ring 5 is cooled to form the protection layer of the ring 5. The molten steel coming into contact with the brick 4 forms as well as solidified shell on the feeding head part. In this way, it is easily solidified even at the time when the molten steel is flowed into the gap of the slug and solidified shell at the solidification contraction time of the steel ingot and the flow of the molten steel into the gap of the mold and steel ingot is prevented.

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