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21. 发明专利

JPS62284009A TAPPING METHOD FOR MOLTEN METAL 失效
公开(公告)号：JPS62284009A
公开(公告)日：1987-12-09
申请号：JP12762286
申请日：1986-06-02
申请人： NIPPON KOKAN KK
发明人： HIRANO MINORU , TOYODA KOJI , ISHIKAWA HIROAKI
IPC分类号： C21C5/46
摘要： PURPOSE:To economically and surely prevent the outflow of slag by immersing a cylindrical member having an adequate inside area into the slag in the region right above a tap hole at the time of tapping of a molten metal and adding a hardener to the slag in said cylindrical member, thereby hardening the slag. CONSTITUTION:A converter 11 is tilted to tap a molten steel 13 from the tap hole 12. The cylindrical member 16 is immersed into the slag 14 in the area right above the tap hole 12 in this state. The above-mentioned cylindrical member 16 is constituted of a material having the inside area larger than the aperture area of the tap hole 12 and having the specific gravity slightly larger than the specific gravity of the slag 14 which floats on the molten steel 13. The above-mentioned cylindrical member 16 is thereby held still while the lower part thereof is partly held immersed in the molten steel 13. The hardener 19 consisting of calcium carbonate is added from a supply pipe 17 to the region enclosed by the cylindrical member 16 in this state to harden said slag. The outflow of the slag 14 is thereby prevented and the tapping is ended in the state of allowing just a small amt. of the molten steel 13 remaining in the tap hole.

22. 发明专利

JPS59145481A Siphon type converter slag cutting device 失效
标题翻译： SIPHON型转换器切割装置
公开(公告)号：JPS59145481A
公开(公告)日：1984-08-20
申请号：JP1812183
申请日：1983-02-08
申请人： Nippon Kokan Kk
发明人： ISHIKAWA HIROAKI , KURIYAMA SHINJI , HASEGAWA TERUYUKI , SHIRATANI YUUSUKE , KITAMURA MINORU , KATOU KAZUYOSHI , TANABE HARUYOSHI , YAMASE OSAMU
IPC分类号： C21C5/46 , F27B3/18 , F27D3/15

23. 发明专利

JPS59144563A Siphon type ladle slag cutter for continuous casting 失效
标题翻译：用于连续铸造的SIPHON型拉链切割机
公开(公告)号：JPS59144563A
公开(公告)日：1984-08-18
申请号：JP1812283
申请日：1983-02-08
申请人： Nippon Kokan Kk
发明人： ISHIKAWA HIROAKI , KURITA SHINJI , HASEGAWA TERUYUKI , ISHIDA TOSHIAKI , SHIRATANI YUUSUKE , TANABE HARUYOSHI , KITAMURA MINORU , KATOU KAZUYOSHI , YAMASE OSAMU
IPC分类号： B22D11/10 , B22D41/08
CPC分类号： B22D41/08
摘要： PURPOSE:To provide a titled device which removes efficiently slag and to extend the life of refractories by constituting so that a molten metal receiving tank provided with a siphon pipe for tapping a molten steel in the bottom is disposed between a ladle and a tundish via a swiveling and tilting device. CONSTITUTION:A siphon type slag curtting pot 4 as a molten metal receiving tank is constituted by lining the inside of a shell with refractories and providing a siphon pipe 5 of a material such as a heat resisting steel. The height of the slag designated as (hs), the height of the metal as (hm), the specific gravity of the slag S as rhos and the specific gravity of the metal M as rhom are set like hs.rhos
摘要翻译：目的：提供一种标题装置，其有效去除炉渣并延长耐火材料的使用寿命，使得设置有用于在底部开采钢水的虹吸管的熔融金属接收罐经由钢包和中间包经由旋转和倾斜装置。构成：作为熔融金属容纳槽的虹吸式炉渣搅拌罐4是用耐火材料将壳体内部衬里并提供诸如耐热钢的材料的虹吸管5构成的。渣的高度（hs），金属的高度（hm），炉渣S的比重为rhos，金属M的比重为rhom，设定为hs.rhos

24. 发明专利

JP2000144232A PRODUCTION OF HIGHLY CLEANED STEEL 失效
公开(公告)号：JP2000144232A
公开(公告)日：2000-05-26
申请号：JP31870998
申请日：1998-11-10
申请人： NIPPON KOKAN KK
发明人： SAKURAI EIJI , ISHIKAWA HIROAKI , YOSHIOKA KEIJI , SUGIYAMA SHINICHI , MATSUNO EIJU , MURAI TAKESHI , OZAWA KOICHI , TERAOKA TAKUJI , KODAIRA SATOSHI , OSAME MASAO
IPC分类号： C21C7/04 , C21C7/06 , C21C7/076 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a producing method of a highly cleaned steel, in which the reaction between molten steel and slag is prevented by sufficiently reducing the slag and the clean steel having little inclusion is stably produced. SOLUTION: The molten steel 5 obtd. with converter refining, is tapped from the converter 2 to a ladle 3 and slag modifier 7 is added into the slag 6 floated up on the tapped molten steel in undeoxidizing state to reduce the iron oxide in the slag. Successively, the molten steel in the undeoxidizing state is decarburized in an RH vacuum degassing apparatus 4 and after decarburizing, Al is added into the molten steel to execute the deoxidation, and after deoxidizing, the surface position of the molten steel in the ladle is vertically shifted to reduce the iron oxide in the slag. At this time, after deoxidizing, the slag modifier is desirable to supplement into the slag on the molten steel in the ladle.

25. 发明专利

JPH046209A METHOD FOR CONTROLLING MANGANESE IN MOLTEN STEEL IN CONVERTER 失效
公开(公告)号：JPH046209A
公开(公告)日：1992-01-10
申请号：JP10648090
申请日：1990-04-24
申请人： NIPPON KOKAN KK
发明人： YAMADA KAORU , MIYAHARA HIROAKI , ISHIKAWA HIROAKI , KEIHO TAKASHI
IPC分类号： C21C5/28 , C21C5/30
摘要： PURPOSE:To control oxygen quantity at blowing stop and adding quantity of manganese ore at the end period of blowing by continuously measuring gas quantity and components in blowing exhaust gas produced from a converter during refining and continuously estimating manganese concn. in molten steel based on the measured value. CONSTITUTION:The components in exhaust gas produced from the furnace are continuously measured with a mass spectrometer and C concn. in the molten steel, residual oxygen, molten steel temp., Mn concn. in the molten steel, etc., are continuously estimated with each estimating model to decide action. In order to make the estimated manganese concn. in the molten steel at the end period of blowing high, the manganese ore is supplementarily charged and in order to make the above low, by supplementing the blowing oxygen quantity, the aimed manganese concn. in the molten steel is obtd.

26. 发明专利

JPH03180418A METHOD FOR CONTROLLING CARBON IN MOLTEN STEEL IN CONVERTER 失效
公开(公告)号：JPH03180418A
公开(公告)日：1991-08-06
申请号：JP31899689
申请日：1989-12-11
申请人： NIPPON KOKAN KK
发明人： YAMADA KAORU , MIYAHARA HIROAKI , ISHIKAWA HIROAKI , KUBO TAKASHI
IPC分类号： C21C5/30
摘要： PURPOSE:To improve the yield and to shorten steelmaking time by continuously estimating oxygen efficiency for decarbonization in molten steel, etc., using measured values for quantity and components in blowing waste gas from a converter, correcting decarbonizing presuming curve on this and executing calculation for blowing out. CONSTITUTION:The quantity and components in the blowing waste gas generated from the converter during refining are continuously measured. Further, a decarbonizing model, which expresses unifiedly the oxygen efficiency for decarbonization in the ordinary blowing over the whole carbon range is obtd. The above measured value is introduced into this model, and carbon concn. in the molten steel and oxygen efficiency for decarbonization in the molted steel are continuously estimated. Successively, based on this estimated value, preset decarbonizing presuming curve is corrected and the calculation for blowing out is executed.

27. 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.

28. 发明专利

JPH0257629A METHOD FOR ASSUMING MOLTEN STEEL CARBON IN CONVERTER 失效
公开(公告)号：JPH0257629A
公开(公告)日：1990-02-27
申请号：JP20781488
申请日：1988-08-22
申请人： NIPPON KOKAN KK
发明人： MIYAHARA HIROAKI , YAMADA KAORU , TOYODA KOJI , ISHIKAWA HIROAKI
IPC分类号： C21C5/46
摘要： PURPOSE:To assume carbon content in molten steel in a converter at high accuracy by measuring molten steel temp. and the solidified temp. during refining in the converter by using dephosphorized molten iron, obtaining primary assuming carbon content and assuming Mn content to assume the carbon content. CONSTITUTION:At the time of assuming the carbon content in the molten steel during refining in the converter by using the dephosphorized molten iron, consumable type measuring sensor is fitted to a sublance parallel arranged to an oxygen lance to measure the molten metal temp. and the solidified temp. The primary assuming carbon content in the molten steel is obtd. from the prescribed equation by using the obtd. solidified temp. and the assuming Mn content in the molten steel is obtd. from the equilibrium equation and mass balance equation by using this primary assumed carbon content and the obtd. molten steel temp. Successively, the carbon content is obtd. from the primary assumed carbon content and the assumed Mn content. In such a way, as the carbon content in the molten steel is obtd. under consideration of Mn content in the molten steel, the assuming accuracy is drastically improved.

29. 发明专利

JPH01309914A METHOD FOR DEPHOSPHORIZING MOLTEN IRON 失效
公开(公告)号：JPH01309914A
公开(公告)日：1989-12-14
申请号：JP13912488
申请日：1988-06-06
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA HIROAKI
IPC分类号： C21C1/02
摘要： PURPOSE:To reduce deviation to the aimed value of phosphorus component after dephosphorizing treatment by measuring the phosphorus component in molten iron by using a P sensor during the dephosphorizing treatment and adding the necessary quantity of flux based on this result. CONSTITUTION:In the pre-treatment process of the molten iron, the P content in the molten iron and the molten iron temp. before pre-treatment are measured and the quantity of the flux calculated based on the P aimed value after the pretreatment is charged. From this value, change of P in the molten iron with the lapse of time is predicted. Further, the phosphorus sensor is dipped into the molten iron on the way of the process to measure P in the molten iron. Based on the difference between this measured value and the predicted value of P obtd. from the predicted change of P with the lapse of time, the adding quantity of the flux to be necessary to hit to the aimed value of P after the pre-treatment is calculated, and additionally changed.

30. 发明专利

JPH01298109A METHOD FOR CONTROLLING MANGANESE CONTENT AT THE TIME OF STOPPING BLOWING IN CONVERTER 失效
公开(公告)号：JPH01298109A
公开(公告)日：1989-12-01
申请号：JP12713888
申请日：1988-05-26
申请人： NIPPON KOKAN KK
发明人： MIYAHARA HIROAKI , YAMADA KAORU , TOYODA KOJI , ISHIKAWA HIROAKI
IPC分类号： C21C5/30
摘要： PURPOSE:To control Mn content in molten steel to be aimed at good accuracy and to improve the hitting ratio of C content at the time of stopping blowing by obtaining assumed Mn content from measured values of temp. and C content of the molten steel at the end stage of refining at the time of steelmaking refining in a converter from dephosphorized molten iron as raw material and further, comparing the assumed Mn at the time of stopping the blowing obtd. from end point control model. CONSTITUTION:At the time of producing the molten steel by decarburized refining with oxygen blowing after charging the pre-dephosphorized molten iron into the oxygen top and bottom flowing converter, the temp. and C content in the molten steel at end stage of blowing are measured with the sub-lance and the assumed value of Mn in the end stage of the blowing is obtd. from these measured values. At the same time, the assumed Mn content at the time of stopping the blowing is obtd. based on the assumed C content and temp. at the time of stopping the blowing calculated with the end point control model from the above both measured values. From the assumed Mn, etc., at the end stage of the flowing and the assumed Mn content at the time of stopping the flowing, O2 quality consumed with oxidized loss of Mn, is calculated, and the oxidized loss O2 quantity for Mn is added to the additional O2 quantity needed to decarburization and the raising temp. calculated with the end point model and the end point blowing is executed and Mn content at the time of stopping the blowing into the converter is controlled and C level in the molten steel at the end stage is accurately hit to the aimed value.

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