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1. 发明专利

JPS638259A ZIRCONIA-SILICA BASE POROUS PLUG WITH PENETRATED PORES 失效
公开(公告)号：JPS638259A
公开(公告)日：1988-01-14
申请号：JP14710086
申请日：1986-06-25
申请人： NIPPON KOKAN KK , SHINAGAWA REFRACTORIES CO
发明人： HASEGAWA TERUYUKI , ASANO NOBUNARI , FUKUSHIMA HIRONORI , NISHI MASAAKI , YORITA EIICHI , SUGIMOTO HIROYUKI , NAKAMURA RYOSUKE
IPC分类号： C04B35/14 , C04B35/48 , C04B38/00 , C22B9/05

2. 发明专利

JPH04107205A REFINING METHOD BY CONVERTER USING OXYGEN-LESS MIDDLE PURITY GASEOUS ARGON 失效
公开(公告)号：JPH04107205A
公开(公告)日：1992-04-08
申请号：JP22357290
申请日：1990-08-24
申请人： NIPPON KOKAN KK
发明人： IINO YOSHITSUGU , HASEGAWA TERUYUKI , FUKUSHIMA SHINICHIRO , KOBAYASHI KOJI , KOBAYASHI SHUJI , FUJII SHIRO
IPC分类号： C21C5/30
摘要： PURPOSE:To hold service life of a tuyere at furnace bottom in a converter and to execute converter refining without any influence to steel kind in the converter refining by blowing oxygen-less middle purity gaseous argon into molten iron in the furnace from furnace bottom in the converter and refining the molten iron with top-blowing oxygen while stirring the molten iron. CONSTITUTION:The molten iron is charged into the converter 1 through a ladle, and by blowing the oxygen from a top lance 2, the blow-refining is executed. Then, in preceding this, the gaseous argon is blown from the bottom blow tuyere 4 and with a sublance 4, temp. of molten steel in the refining and instantaneous necessary compositions in the molten steel are measured. As the gaseous argon, the oxygen-less middle purity gaseous argon containing 97-99% Ar is used.

3. 发明专利

JPH02303658A MOLD POWDER FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH02303658A
公开(公告)日：1990-12-17
申请号：JP12603389
申请日：1989-05-19
申请人： NIPPON KOKAN KK
发明人： KUBO TAKASHI , HASEGAWA TERUYUKI
IPC分类号： B22D11/07
摘要： PURPOSE:To maintain the necessary characteristic of mold powder by specifying the composition of the mold powder for continuous casting. CONSTITUTION:The main component of the mold powder for continuous casting to the steel kind of low alloy incorporating 1.0-5.0wt.% Mn, is made to CaO-Al2 O3-SiO2 series composition and further constituted by incorporating 2.0-6.0wt.% MnO. By this method, surface flaw on a continuous cast billet having small cross section can be reduced.

4. 发明专利

JPH0273913A METHOD FOR ADJUSTING MOLTEN STEEL COMPONENT IN LADLE REFINING 失效
公开(公告)号：JPH0273913A
公开(公告)日：1990-03-13
申请号：JP22433888
申请日：1988-09-07
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA HIROAKI , HASEGAWA TERUYUKI , MIYAHARA HIROAKI
IPC分类号： C21C7/00
摘要： PURPOSE:To quickly execute adjustment of Mn content in molten steel by obtaining shortage content of Mn in the molten steel with a Mn sensor providing an element coating oxide containing Mn on solid electrolyte having oxygen ion conductivity. CONSTITUTION:The sensor part 30 of a probe 14 is dipped into the molten steel in a ladle under treatment to obtain Mn activity in the molten steel. The probe 14 is composed of the sensor part 30 and a protecting tube 31 and the element 35 composing of the solid electrolyte 37 of ZrO2 coating Mn3O4 layer 38 on the surface, is provided in the sensor part 30 and in the inner part thereof, reference material 36 composing of mixed material of Cr and Cr2O3 is enclosed and a measuring electrode 40 is inserted. By the sensor part 30 having this constitution, electromotive force of Mn in the molten steel is detected to obtain the Mn activity, and by using this Mn activity, the shortage content of Mn is obtd. and Mn containing material quantity corresponding to the shortage content, is added. By this method, the treating time of molten steel is drastically shortened and the treating cost is reduced.

5. 发明专利

JPH01116018A CONVERTER STEELMAKING METHOD 失效
公开(公告)号：JPH01116018A
公开(公告)日：1989-05-09
申请号：JP27166587
申请日：1987-10-29
申请人： NIPPON KOKAN KK
发明人： TABATA YOSHIAKI , MURAKI YASUNORI , HASEGAWA TERUYUKI
IPC分类号： C21C5/28
摘要： PURPOSE:To raise efficiency of blowing operation by charging briquette having the specified sp.gr. together with material mixing one or more kinds of specific material with converter powdery dust containing iron powder from opening part of the converter. CONSTITUTION:The briquette 7 having the sp.gr. between sp.grs. of molten slag 6 and molten steel 5 with pitch series binder is charged into the converter 1 from a hopper 3 through a chute 4 together with the material mixing one or more kinds of coal powder or coke powder with the converter powdery dust and oxygen is blown from an oxygen lance 2 for refining. Then, when the briquette 7 is passed through the slag 6, the briquette 7 is collapsed to fine powder state caused by thermal reaction and reacted with FeO in the slag and generates CO2 or CO and as it is exhausted from the slag as the gas, the slag 7 is killed and foaming can be prevented. By this method, the blowing operation can be executed under good efficiency.

6. 发明专利

JPS63100117A METHOD FOR BLOWING MOLTEN METAL BY BOTTOM BLOWING NOZZLE 失效
公开(公告)号：JPS63100117A
公开(公告)日：1988-05-02
申请号：JP24458886
申请日：1986-10-15
申请人： NIPPON KOKAN KK
发明人： TABATA YOSHIAKI , HASEGAWA TERUYUKI , HIRANO MINORU , TOYODA KOJI
IPC分类号： C21C5/34 , C21C5/48
摘要： PURPOSE:To simplify exchange of a nozzle and repairing work of refractory by inserting a pipe in a penetrated hole formed on bottom part of a vessel at a position apart from the bottom blowing nozzle in case of wear of the refractory near the nozzle and blowing gas into molten metal through only this pipe. CONSTITUTION:When furnace body temp. of converter after tapping molten steel is fallen down to the temp. to be possible to work, a flange 26 is fixed by welding to a suitable position in the iron shell 12 of furnace bottom apart from the above condition nozzle 14. And, after boring the iron shell 12 and the refractory 10 by inserting an edge tip of drill in the center hole of flange 26, the pipe for nozzle 28 is inserted in the penetrated hole obtd. Next, the tip part of pipe 28 is pushed by using a stopper jig from the inside of furnace, to prevent the projection of the pipe 28 to the inside of furnace by the pouring pressure of press-fitting agent. Further, gelling alumina cement is pressed to fit between the pipe 28 and the refractory 10 through a hose screwing the tip thereof into the hole 27 of flange 26. And, after forming the new nozzle 24, the piping 20 of existing nozzle 14 is taken out and the refractory is filled up in the passage 15 and a plug is driven into the opening at the outside of passage 15 to clog the passage 15.

7. 发明专利

JPS6217003B2 失效
公开(公告)号：JPS6217003B2
公开(公告)日：1987-04-15
申请号：JP20654983
申请日：1983-11-02
申请人： NIPPON KOKAN KK
发明人： TSUBOI ISAMU , EDANE TOSHIO , FUKUDA MASACHIKA , HASEGAWA TERUYUKI , NIMURA YOICHI , ISHIKAWA HIROAKI
IPC分类号： C21C5/38 , F27D17/00

8. 发明专利

JPS6280217A PRODUCTION OF HIGH-PURITY STAINLESS STEEL 失效
公开(公告)号：JPS6280217A
公开(公告)日：1987-04-13
申请号：JP21924485
申请日：1985-10-03
申请人： NIPPON KOKAN KK
发明人： HASEGAWA TERUYUKI , MORI HAJIME , HIRANO MINORU , USUI TSUTOMU , KAWAI YOSHIHIKO , KIKUCHI YOSHITERU , TAKAHASHI KENJI
IPC分类号： C21C7/00 , C21C5/00 , C21C5/35 , C21C7/072 , C21C7/10
摘要： PURPOSE:To produce a stainless steel contg. O2 and N2 at extermely low rations by charging the melt of the stainless steel which is a raw material into a bottom blown converter, hermetically closing the converter and evacuating the inside of the converter to a reduced pressure, then blowing gaseous Ar and gaseous O2 from the bottom tuyeres into the molten steel, thereby executing stirring and decarbruzation refining of the molten metal. CONSTITUTION:The melt of the high-carbon stainless steel contg. about 2% C is charged into the bottom blown converter and is refined to the ordinary molten steel by oxygen top blowing refining in an ordinary manner. The converter is then hermetically closed and after the inside thereof is evacuated to about 10-760Torr, the gaseous Ar is blown at a ratio of 0.5Nm /min.ton and gaseous O2 at a ratio of 2Nm /min.ton from the furnace bottom tuyeres to stir the molten metal and to make oxidation recarburization refining thereof. The extra-low-carbon and extra-low-nitrogen stainless steel cong.

9. 发明专利

JPS6263611A LADLE HAVING LADLE CAP FOR NON-OXIDATION TAPPING OF STEEL AND ITS RECEIVING CARRIAGE 失效
公开(公告)号：JPS6263611A
公开(公告)日：1987-03-20
申请号：JP20181685
申请日：1985-09-13
申请人： NIPPON KOKAN KK
发明人： MORI HAJIME , HIRANO MINORU , HASEGAWA TERUYUKI , KAWAI YOSHIHIKO , KIKUCHI KIYOTERU
IPC分类号： B22D41/00 , C21C5/46 , C21C7/00 , C21C7/072 , C21C7/10
摘要： PURPOSE:To thoroughly and easily prevent the oxidation and nitrogen absorption of a molten metal by the inclusion of air therein by lifting a ladle by a lifting device of a receiving carriage to airtightly mount the ladle via a ladle cap to a tap hole in the upper part and allowing the molten steel to flow downward under a vacuum or Ar seal. CONSTITUTION:The ladle 3 imposed on the receiving carriage 4 which is constructed travelable on rails (not shown) is raised by the lifting device 7 directly provided to the lower part thereof and is matched with and connected to the tap hole 1 of the furnace via the ladle cap 2. An O-ring and gas nozzles 5, 6 are disposed between the connection part of the above-mentioned ladle cap 2 and the tap hole 1 and ladle 3 to airtightly hold the connection part; at the same time, gaseous Ar is ejected from the nozzles to seal the inside of the ladle 3 and the space in the upper part thereof. The connection part may be otherwise connected to a vacuum evacuation system in place of the above-mentioned Ar seal to maintain the internal space in a vacuum state. The molten steel is tapped from the tap hole 1 in the above-mentioned state and is received into the ladle 3 without receiving the contamination by the intrusion of the air.

10. 发明专利

JPS629161B2 失效
公开(公告)号：JPS629161B2
公开(公告)日：1987-02-26
申请号：JP11346880
申请日：1980-08-20
申请人： NIPPON KOKAN KK
发明人： OZEKI AKYA , HASEGAWA TERUYUKI , NIMURA YOICHI , YAMADA KENZO , USUI TSUTOMU , TAMURA KONOSHIN , EDANE TOSHIO
IPC分类号： C21C5/34 , C21C5/32 , C21C5/35 , C21C5/48

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