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31. 发明专利

JPH02221316A CONVERTER TAPPING METHOD 失效
公开(公告)号：JPH02221316A
公开(公告)日：1990-09-04
申请号：JP4227989
申请日：1989-02-21
申请人： NIPPON KOKAN KK
发明人： IKEDA MASABUMI , MASAOKA TOSHIO , FUKUMI JUNICHI , KOMATANI MASANORI , ARAI MANABU , INOUE AKIHIKO
IPC分类号： C21C5/46
摘要： PURPOSE:To prevent the contact of tapping flow with air and to prevent the molten steel from absorbing N2 and from being oxidized at the time of transferring the molten steel in a converter from a tap hole into a ladle by injecting an inert gas from a nozzle mounting pipe around the tap hole and connecting the tap hole of the converter and the steel receiving port of the cap of the ladle by means of respective guide members. CONSTITUTION:The converter 1 is finely moved upon ending of refining in the converter 1 and the tap hole 8 is directed downward to allow the molten steel 6 in the converter to flow down into the ladle 6. Gaseous flow 21 of an inert gas, gaseous CO, gaseous CO2, etc., is formed from the holes 12 of the nozzle mounting pipe 11 around the tap hole 8 so as to enclose the tapping flow 20 from the tap hole 8 at the time of this tapping. A sealing flange 3 provided around the tap hole 8 is simultaneously slid to come into tight contact with a sealing flange 4 provided on the cap 10 of the ladle 2, by which the contact of the tapping flow 20 with the outdoor air is perfectly prevented. The molten steel is thus prevented from absorbing the N2 from the inside of the air and from being oxidized by the O2 in the air.

32. 发明专利

JPH01129921A STEEL TAPPING HOLE FOR CONVERTER 失效
公开(公告)号：JPH01129921A
公开(公告)日：1989-05-23
申请号：JP28713487
申请日：1987-11-13
申请人： NIPPON KOKAN KK
发明人： IKEDA MASABUMI
IPC分类号： C21C5/46
摘要： PURPOSE:To prevent mixing of slag into molten steel from a steel tapping hole for converter at the time of steel-tapping by constituting the steel tapping hole so as to blow inert gas or CO2 into the converter from a gas blowing plug embedding multiple fine diameter steel pipes in a refractory at outer peripheral part of the steel tapping hole for the converter. CONSTITUTION:At the time of the steel-tapping, the inert gas is sent to a header pipe 12 and sent to a blast box 10 from this header pipe 12 through a connecting pipe 11. Then, the inert gas sent to the blast box 10 is introduced into the molten steel 1 through the fine diameter steel pipes 9 in the blowing plug 8. The introduced inert gas is made to bubble and ascended in the molten steel 1, to form the inert gas flow 13 surrounding the steel tapping hole 3. Then, this gas flow 13 forms gushing-out part 16 of the molten steel 1 on the surface of the molten steel and mixing of the slag 2 into the tapping molten steel 1 is prevented. Further, even if CO2 gas is used in replacing with the above inert gas, the same effect is obtd.

33. 发明专利

JPH01108310A HIGH SPEED DECARBONIZING METHOD IN MOLTEN IRON 失效
公开(公告)号：JPH01108310A
公开(公告)日：1989-04-25
申请号：JP26587487
申请日：1987-10-21
申请人： NIPPON KOKAN KK
发明人： IKEDA MASABUMI , UCHIDA SHIGETAKA , KAWASHIMA KAZUTOSHI , FURUNO YOSHIKATSU
IPC分类号： C21C5/56 , C21C5/30 , C21C5/35
摘要： PURPOSE:To execute decarbonization in molten iron at high speed without any heat loss by opening bottom part of a converter to transfer molten iron into a ladle, submerging a submerging tube vertically into transferred molten iron, blowing oxygen from top part and blowing inert gas from the bottom part in the ladle and the submerging tube. CONSTITUTION:The ladle 10 filling up the molten iron 13 is shifted to converter plant with conveying truck and stayed just below the converter 20 laid on floor 11 of a lifting truck. The converter 20 opens the bottom part and the submerging tube 21 is vertically arranged and by ascending the ladle 10, the submerging tube 21 is submerged into the molten iron 13 in the ladle 10. Successively, the decarbonization in the molten iron 13 is started by supplying the oxygen from an oxygen lance 22 and also the inert gas is blown from a porous plug 14 at bottom part of the ladle and tuyeres 24 of the submerging tube 21, to stir the molten iron 13 and promote the decarbonization in the molten iron 13. By this method, the molten iron 13 is decarbonized at high speed without change of the vessels and the heat loss caused by changing the vessels is prevented.

34. 发明专利

JPS6447806A PRODUCTION OF CAST IRON 失效
公开(公告)号：JPS6447806A
公开(公告)日：1989-02-22
申请号：JP20414087
申请日：1987-08-19
申请人： NIPPON KOKAN KK
发明人： UCHIDA SHIGETAKA , YAMASE OSAMU , IKEDA MASABUMI , NAKAJIMA HIROHISA
IPC分类号： C21C1/08
摘要： PURPOSE:To produce cast iron having excellent mechanical strength and ductility by blowing granular carbonic additive in molten iron at the time of adding carbon for adjusting component after executing pretreatment to the molten iron of a blast furnace. CONSTITUTION:In the pretreating process, each process of desiliconization, desulfurization and dephosphorization on casting floor is executed to the molten iron tapped from the blast furnace to remove the impurities. Next, in case the carbon content is the pretreated molten iron is short, an injection lance 51 is set into the molten iron and the granular carbonic additive 52 is blown by carrying in Ar gas from this lance 51. Then, the carbonic additive 52 is desirable to use earthly graphite and this grain size is to regulate to

35. 发明专利

JPS6447805A PRODUCTION OF SILICON-CONTAINING CAST IRON 失效
公开(公告)号：JPS6447805A
公开(公告)日：1989-02-22
申请号：JP20413987
申请日：1987-08-19
申请人： NIPPON KOKAN KK
发明人： UCHIDA SHIGETAKA , YAMASE OSAMU , IKEDA MASABUMI , NAKAJIMA HIROHISA
IPC分类号： C21C1/08
摘要： PURPOSE:To execute heating of molten iron and addition of silicon at the same time with high efficiency by adding the silicon source from the upper part to molten iron and also supplying oxygen into the molten iron while powder- injecting granular lime series flux into the molten iron. CONSTITUTION:Pretreatment containing each process of desiliconization, desulfurization and dephosphorization on casting floor is executed to the molten iron tapped from a blast furnace to lower content of impurities in the molten iron 23. Next, the silicon source 53 is added to the molten iron 23 in the molten iron ladle 27 from a hopper 55 at the upper part and also while powder-injecting the lime series flux 56 of granular CaO, etc., from an injection lance 51 by Ar gas, etc., oxygen gas is blown into the molten iron 23 from a lance 52. By this method, a part of the silicon source 53 is oxidized and temp. of the molten iron 323 is raised at about 1,450 deg.C to be possible to cast by the above oxidizing heat and also the nonoxidized silicon is contained into the component in the molten iron 23. Next, by executing Mg addition and casting, the silicon- contained cast iron having excellent mechanical strength and ductility is produced at low cost.

36. 发明专利

JPS63310913A PRODUCTION OF CAST IRON 失效
公开(公告)号：JPS63310913A
公开(公告)日：1988-12-19
申请号：JP14572687
申请日：1987-06-11
申请人： NIPPON KOKAN KK
发明人： UCHIDA SHIGETAKA , YAMASE OSAMU , IKEDA MASABUMI , NAKAJIMA HIROHISA
IPC分类号： C21C1/02 , C21C1/08
摘要： PURPOSE:To obtain the title cast iron having high mechanical strength and toughness at a low cost by removing the dephosphorizing slag generated in the dephosphorizing stage, diluting the remaining slag to form dil. slag, removing the dil. slag and then supplying the molten iron freed of the dil. slag in a casting mold, and casting the molten iron into a specified shape. CONSTITUTION:Blast-furnace molten iron is pretreated to reduce the content of impurities, especially phosphorus, the composition of the pretreated molten iron is adjusted, and the molten iron is cast into a specified shape. In this case, the dephosphorizing slag generated in the dephosphorizing stage is removed, the remaining slag is diluted, and the dil. slag is removed. By this method, reinfiltration of phosphorus into the molten iron can be almost completely prevented, and the content of phosphorus can be remarkably reduced. In addition, since the content of impurities, especially phosphorus, can be thus reduced, the toughness can be enhanced. Moreover, since the cost of the blast-furnace molten iron itself is low, the production cost can be remarkably reduced.

37. 发明专利

JPS63274711A PRODUCTION OF CAST IRON 失效
公开(公告)号：JPS63274711A
公开(公告)日：1988-11-11
申请号：JP10684687
申请日：1987-04-30
申请人： NIPPON KOKAN KK
发明人： UCHIDA SHIGETAKA , YAMASE OSAMU , IKEDA MASABUMI , NAKAJIMA HIROHISA
IPC分类号： C21C1/02 , C21C1/04 , C21C1/08
摘要： PURPOSE:To produce a cast iron having excellent mechanical strength and ductility at low cost by reducing impurity contents in molten iron of a blast furnace, adjusting component contents and casting the prescribed shape to execute in order each process. CONSTITUTION:By blowing desiliconizing agent into the molten iron tapping from the blast furnace, silicon content in the molten iron is reduced from about 0.3wt.% to about 0.1% and after desiliconized slag is removed, by adding desulfurizing agent, sulfur content is reduced from about 0.03% to about 0.001% and desulfurized slag is removed. Further, while stirring the molten iron by supplying oxygen source and Ca contained material, phosphorous content is reduced from about 0.1% to about 0.01%, to complete pretreatment. Next, after finely adjusting carbon content so as to become the desired value of the carbon content in the molten iron, silicon is added so as to become the silicon content of spherical graphite cast iron in the molten iron. Further, after heating the molten iron to raise to the temp. which is able to cast, (about 1,450 deg.C), Mg is added and immediately it is supplied into the mold to cast to the prescribed shape.

38. 发明专利

JPS63274710A PRODUCTION OF SILICON-CONTAINING CAST IRON 失效
公开(公告)号：JPS63274710A
公开(公告)日：1988-11-11
申请号：JP10684587
申请日：1987-04-30
申请人： NIPPON KOKAN KK
发明人： UCHIDA SHIGETAKA , YAMASE OSAMU , IKEDA MASABUMI , NAKAJIMA HIROHISA
IPC分类号： C21C1/02 , C21C1/04 , C21C1/08
摘要： PURPOSE:To produce a silicon-containing cast iron having high mechanical strength and ductility by adding silicon while heating molten iron by oxidizing heat caused by adding silicon and oxygen at the component adjusting stage at the time of executing in order pretreatment, component adjustment, casting, to the molten iron of a blast furnace. CONSTITUTION:To the molten iron tapping from the blast furnace, the pretreatment, in which contains desiliconizing treatment, desiliconized slag removal, desulfurizing treatment, desulfurized slag removal, dephosphorizing treatment and dephosphorized slag removal are in order executed, is executed to reduce silicon content from about 0.3wt.% to about 0.1%, sulfur content from about 0.03% to about 0.001% and phosphorous content from about 0.1% to about 0.01%. Next, after finely adjusting carbon content in the molten iron, the silicon is supplied into the molten iron and also oxygen gas is blown and while raising to the molten iron temp., which is able to cast (about 1,450 deg.C) caused by oxidized heat, the silicon is added so as to become silicon content for spheroidal graphite cast iron in the molten iron. Further, Mg is added and casting is quickly executed and the product having the prescribed shape is produced.

39. 发明专利

JPS63137117A REPAIRING METHOD FOR FURNACE BODY 失效
公开(公告)号：JPS63137117A
公开(公告)日：1988-06-09
申请号：JP28247086
申请日：1986-11-27
申请人： NIPPON KOKAN KK
发明人： HARADA SHOJI , TAKI CHIHIRO , IKEDA MASABUMI
IPC分类号： C21C5/44 , F27D1/16
摘要： PURPOSE:To uniformly and instantaneously repair whole inside furnace without using patching agent and coolant, by injecting inert gas from a lance to slag remaining in the furnace after tapping off the steel, cooling the slag and at the same time, spattering the slag in while inside of furnace. CONSTITUTION:The lance 22 is inserted in the furnace body 12 and O2 gas is blown through the lance 22 to execute blowing. And, after blowing, the lance 22 is pulled out of the furnace body 12, and by tilting the furnace body 12 to tapping off the steel. After that, the furnace body 12 is again returned back to the ordinary position and the lance 22 is inserted in the furnace body 12. Next, by injecting, the inert gas, such as N2 gas, against the remaining slag 24 in the furnace body 12 from the lance 22, the slag 24 is cooled and at the same time, it is scattered in whole inside of furnace as showing by the arrow mark. In this way, the slag 24 is stuck to the inside surface of furnace, that is furnace brick, and the repair of furnace body 12 is executed.

40. 发明专利

JPS62267410A VACUUM REFINING METHOD FOR MOLTEN METAL 失效
公开(公告)号：JPS62267410A
公开(公告)日：1987-11-20
申请号：JP10908486
申请日：1986-05-13
申请人： NIPPON KOKAN KK
发明人： IKEDA MASABUMI , YAMASE OSAMU
IPC分类号： C21C7/10
摘要： PURPOSE:To decarburize a molten metal down to an extra-low carbon region without extending the time for refining by detecting the molten metal level position of the molten metal in a vacuum degassing vessel by a rangefinder and controlling an evacuation device in accordance with the detected value to control the molten metal level position so as to be kept in a prescribed range. CONSTITUTION:The inside of a degassing vessel body 11 is evacuated and maintained under the reduced pressure by operating the evacuation device 40 to rise the molten steel 17 in a ladle 18 into the body 11 via a riser 12. The molten steel is then returned via a downcomer 13 into the ladle 18. The molten steel 17 is decarburized by bringing the oxygen and carbon therein into reaction. Gaseous Ar is blown to the molten steel 17 via a supply pipe 16 to relatively reduce the weight of the molten steel 17 in the riser 16. The molten metal level position of the molten steel 7 is detected by the rangefinder 20 provided in the upper part of the body 11 and the detected value thereof is outputted to a process controller 30 in the above-mentioned operation. The process controller 30 outputs a control signal to the evacuation device 40 in accordance with the signal of the detected value to control the rate of discharge, by which the molten metal level position of the molten steel 17 is feedback-controlled. The molten metal level position is thereby maintained in the prescribed range and the need for extending the time for vacuum refining is eliminated.

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