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1. 发明专利

JP2985643B2 失效
公开(公告)号：JP2985643B2
公开(公告)日：1999-12-06
申请号：JP3064394
申请日：1994-02-28
申请人： NIPPON KOKAN KK
发明人： MURAI TAKESHI , KAMEMIZU AKIRA , TERAOKA TAKUJI
IPC分类号： C21C7/10 , C21C7/00 , C21C7/068

2. 发明专利

JPS6328820A LADLE REFINING DEVICE 失效
公开(公告)号：JPS6328820A
公开(公告)日：1988-02-06
申请号：JP16968886
申请日：1986-07-21
申请人： NIPPON KOKAN KK
发明人： FURUNO YOSHIKATSU , NAKAJIMA HIROHISA , SHIROYAMA AKIRA , TERAOKA TAKUJI
IPC分类号： C21C7/00
摘要： PURPOSE:To enable complete collection of the dust generated during refining by a dust collecting hood of a ladle refining device for a metal provided with electrodes by forming the above-mentioned dust collecting hood in such a manner that the hood can be moved upward and downward with respect to a water-cooled cap of the ladle. CONSTITUTION:The dust collecting hood 5 having electrode insertion holes is provided to the upper part of the water-cooled cap 3 having the same electrode insertion holes of the ladle refining device provided with the graphite electrodes 4. The dust collecting hood 5 is so constructed that the hood can be moved upward and downward by hydraulic or other methods. An annular projecting part 3b is formed on the peripheral edge of each electrode insertion hole of the cap 3 and an annular step part 5b engaging with said annular projecting part 3b is formed on the peripheral edge in the electrode insertion part of the hood 3. The hood 3 is lowered to engage the annular step parts 5b with the annular projecting parts 3b of the cap 2 at the time of subjecting a molten iron 1 in the ladle 2 to ladle refining by the energization of the electrodes 4. The dust generated in the ladle during the refining is thereby completely collected into the hood 5 and the leakage of the dust to the outside of the ladle and the consequent pollution of the working environment are obviated.

3. 发明专利

JPS62224474A LADLE REFINING APPARATUS 失效
公开(公告)号：JPS62224474A
公开(公告)日：1987-10-02
申请号：JP6593086
申请日：1986-03-26
申请人： NIPPON KOKAN KK
发明人： FUJITA TADAYOSHI , MURAKAMI NAOHIKO , NAKAJIMA HIROHISA , TERAOKA TAKUJI
IPC分类号： B22D43/00
摘要： PURPOSE:To uniformly attract dusts and to improve the collecting efficiency of the dusts by connecting an attracting duct corresponding to each electrode position at an outer marginal part of a dust collecting hood having penetrating holes for three phase electrodes. CONSTITUTION:The attracting ducts 7 are connected at the positions corresponding to the three electrode 4 positions at the outer marginal part of the dust collecting hood 5. In this way, by attracting uniformly the dusts exhausted from the electrode inserting holes of a water cooling cover 3, the collecting efficiency of the dusts is improved. In this case, as the dust collecting hood 5 is arranged as shiftable vertically, and also is formed as an annular projecting part 3a at the margin of the electrode inserting hole of the water cooling cover 3 and an annular step part 5a, engaging with the projecting part 3a, at the margin of the electrode penetrating hole of the dust collecting hood 5, quantity of the sucking air is decreased and furthermore, the collecting efficiency of the dusts is improved.

4. 发明专利

JPS62224451A LADLE REFINING METHOD 失效
公开(公告)号：JPS62224451A
公开(公告)日：1987-10-02
申请号：JP6592986
申请日：1986-03-26
申请人： NIPPON KOKAN KK
发明人： MURAKAMI NAOHIKO , NAKAJIMA HIROHISA , FURUNO YOSHIKATSU , TERAOKA TAKUJI
IPC分类号： B22D1/00 , B22D43/00
摘要： PURPOSE:To prevent the invasion of the outside air in the inside of a water cooling cover through electrode inserting holes at the time of refining by bringing a dust collecting hood into closely contact with the water cooling cover, controlling a suction force of a dust collector as keeping the pressure at the electrode inserting part of the water cooling cover to the slight positive pressure and also introducing inert gas in the inside of the water cooling cover. CONSTITUTION:The dust collecting hood 5 has penetrating holes for penetrating the electrodes 4 and is arranged so as to move vertically. At the time of the refining, the dust collecting hood 5 is descended and brought into closely contact with the water cooling cover 3. And, the dusts are collected under condition as keeping the pressure at the electrode 4 inserting part of the water cooling cover to the slight positive pressure by controlling an inlet damper of the dust collector, connected with a suction duct 6. At the same time, the inert gas is introduced in the inside of the water cooling cover 3, to keep the positive pressure in the inside of the water cooling cover 3. In this way, the invasion of the outside air in the inside of the water cooling cover 3 is prevented and therefore the increases of N2 concentration in the molten steel and the oxidizing loss of alloy are prevented.

5. 发明专利

JPS62224448A LADLE REFINING APPARATUS 失效
公开(公告)号：JPS62224448A
公开(公告)日：1987-10-02
申请号：JP6593186
申请日：1986-03-26
申请人： NIPPON KOKAN KK
发明人： FURUNO YOSHIKATSU , MURAKAMI NAOHIKO , NAKAJIMA HIROHISA , TERAOKA TAKUJI
IPC分类号： B22D1/00 , B22D43/00
摘要： PURPOSE:To perfectly collect exhausting dusts from electrode inserting holes and to prevent the invasion of the outside air under positive pressure in the inside of a water cooling cover by arranging the dust collecting hood having electrode penetrating holes so as to move vertically faced to the water cooling cover having the electrode inserting holes. CONSTITUTION:The water cooling cover 3 having the electrode inserting holes is fitted on a ladle 2, pouring molten steel 1 and three-phase electrodes 4 are inserted into the molten steel 1 to execute heating and refining. The dust collecting hood 5 having electrode 4 penetrating holes, faced to the water cooling cover 3 is equipped, so as to move vertically by hydraulic pressure, etc., and at the time of heating stage, the dust collecting hood 5 is ascended to execute dust collecting at the position of slow dust ascending speed and the pressure in the inside of the water cooling cover 3 is made to the positive pressure. Further, at the time of no heating stage, the dust collecting hood 5 is brought into closely contact with the water cooling cover 3 to execute the pressure control in the ladle. In this way, the exhausting dusts from the electrode inserting holes are perfectly collected, and also the invasion of the outside air in the inside of the water cooling cover 3 is prevented.

6. 发明专利

JPH058022A METHOD FOR PREVENTING CLOGGING OF POURING HOLE AT THE TIME OF POURING MOLTEN HIGH CARBON STEEL FROM MOLTEN STEEL LEVEL 失效
公开(公告)号：JPH058022A
公开(公告)日：1993-01-19
申请号：JP16060891
申请日：1991-07-01
申请人： NIPPON KOKAN KK
发明人： TERAOKA TAKUJI
IPC分类号： B22D11/10 , B22D41/46
摘要： PURPOSE:To prevent clogging of a pouring hole for molten steel in a molten steel vessel by packing carbon-coated silica sand into the pouring hole in the molten steel vessel and also piling the specific quantity of olivine sand on a bottom refractory. CONSTITUTION:The pouring hole 27 formed of an upper nozzle 22 arranged at lower part of the molten steel vessel 21, a fixed plate 24 and slide plate 25 in the nozzle 23. Into the pouring hole 27, the carbon-coated silica sand 1 is packed and on this, the olivine sand 2 having apparent density of 3-7.5 times of the carbon-coated silica sand is piled on the bottom refractory in the vessel 21 so as to cover the pouring hole 27. At the time of pouring the molten steel into the vessel, the molten steel is not brought into direct contact with the carbon-coated silica sand 1. On the surface of olivine sand 2 contacting with the molten steel, the suitable sintered layer is formed, but as infiltration of the molten steel is not developed, the carbon-coated silica sand 1 is not sintered.

7. 发明专利

JPH02156015A DEGASSING REFINING METHOD 失效
公开(公告)号：JPH02156015A
公开(公告)日：1990-06-15
申请号：JP30919588
申请日：1988-12-07
申请人： NIPPON KOKAN KK
发明人： FURUNO YOSHIKATSU , TERAOKA TAKUJI , FUKUMI JUNICHI , NAKAJIMA HIROHISA
IPC分类号： C21C7/00 , C21C7/10
摘要： PURPOSE:To adjust nitrogen concn. in molten steel at high accuracy by blowing circulating gas into the molten steel sucked up into a degassing vessel to circulate the molten steel between the degassing vessel and a molten steel vessel and blowing nitrogen gas on the molten steel surface in the vessel in accordance with inner pressure in the vessel. CONSTITUTION:Tubes 12, 14 are dipped into the molten steel 4 in a ladle 2 and the molten steel 4 is sucked up into the degassing vessel 10. Mixed gas of N2 and Ar is blown into molten steel flowing passage in the tube 12 through a fine tube 13 to rise the molten steel 4. The molten steel 4 sucked up into the vessel 10 descends in the other tube 14 and returns back to the ladle 2. Then, the nitrogen gas contained in the gas is dissolved into the molten steel 4, and the nitrogen concn. is raised. At the time of adding alloy material into the molten steel 4, the reaction in the vessel 10 is changed and the inner pressure is varied. This inner pressure in the vessel is detected with a detector 20, and based on this, the nitrogen partial pressure is grasped with the nitrogen gas supplying device 22 and the nitrogen gas is directly blown on the molten steel surface.

8. 发明专利

JPS63137566A SEALING METHOD FOR LADLE OF REFINARY FURNACE 失效
公开(公告)号：JPS63137566A
公开(公告)日：1988-06-09
申请号：JP28061586
申请日：1986-11-27
申请人： NIPPON KOKAN KK
发明人： FURUNO YOSHIKATSU , SHIROYAMA AKIRA , TERAOKA TAKUJI
IPC分类号： B22D1/00 , B22D41/00 , B22D41/015
摘要： PURPOSE:To prevent the infiltration of an air from the gap between the upper end face of a ladle and a water cooling cover and the flow-out of a molten steel, to maintain the molten steel in good quality, to stabilize the yield thereof and to reduce the breakdown of a ladle by spreading fireclay refractories all over the upper end face of the ladle and placing a water cooling cover thereon. CONSTITUTION:Fireclay refractory block plates 6 are spreaded all over the upper end face of the ladle 2 in which a molten steel 1 is poured and a water cooling cover 3 is placed thereon. The block plate 6 is crushed with the tare of the water cooling cover 3 to eliminate the gap between the both. Consequently the air infiltration from this gap and the flow-out of the molten steel 1 are prevented to maintain the molten steel in good quality, the yield thereof is stabilized and the damage on the upper end face of the ladle 2 is reduced as well.

9. 发明专利

JPS6320408A LADLE REFINING METHOD 失效
公开(公告)号：JPS6320408A
公开(公告)日：1988-01-28
申请号：JP16612486
申请日：1986-07-15
申请人： NIPPON KOKAN KK
发明人： TERAOKA TAKUJI , KURIYAMA SHINJI , TANABE HARUYOSHI , TAKI CHIHIRO , SHIROYAMA AKIRA , FURUNO YOSHIKATSU
IPC分类号： C21C7/04
摘要： PURPOSE:To add an Mn component to a molten steel at a low cost by charging Mn ore and reducing agent to the molten steel in a ladle and stirring the molten steel so that the Mn ore is reduced by the reducing agent. CONSTITUTION:The molten steel 4 is tapped from a converter into the ladle 2 and the Mn ore and the reducing agent such as Al are charged into the molten steel 4. Gaseous Ar is blown from a lance 6 into the molten steel 4 to stir the molten steel 4, the Mn ore and the reducing agent. The Mn ore is reduced by the reducing agent, by which the Mn is melted into the molten steel 4 and the Mn component is added to the molten steel 4.

10. 发明专利

JPS62213684A SUCTION TYPE SLAG REMOVING METHOD 失效
公开(公告)号：JPS62213684A
公开(公告)日：1987-09-19
申请号：JP5552186
申请日：1986-03-13
申请人： NIPPON KOKAN KK
发明人： NAKAJIMA HIROHISA , FURUNO YOSHIKATSU , TERAOKA TAKUJI
IPC分类号： F27D3/15

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