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1. 发明专利

JPH0273147A MEASUREMENT OF ACTIVITY OF SOLUTE ELEMENT IN MOLTEN METAL 失效
公开(公告)号：JPH0273147A
公开(公告)日：1990-03-13
申请号：JP22433688
申请日：1988-09-07
申请人： NIPPON KOKAN KK , OSAKA OXYGEN IND , SASABE MINORU
发明人： SASABE MINORU , HASEGAWA TERUYUKI , ISHIKAWA HIROAKI , KAWAI YOSHIHIKO , FURUTA CHIKAYOSHI , NAGATSUKA TOSHIO , MATSUSHIGE HARUHIKO
IPC分类号： G01N27/411 , C21C5/28 , F27D21/00
摘要： PURPOSE:To detect the activity aM1 of an objective element with high accuracy by determining the oxygen electromotive force E1 and temperature T of a molten metal by use of a solid electrolyte having oxygen ion conductivity and determining the electromotive force E1 of the objective element by use of a solid electrolyte having oxygen conductivity and covered with an oxide which contains the objective element. CONSTITUTION:When an oxygen sensor comprising a solid electrolyte covered with MOx is dipped in a molten metal containing the solute element M, a local equilibrium layer is formed at the interface of the coating and the molten metal. The activity aM1 of the element M in the molten metal is a function of the activity of oxygen a01, activity of oxygen a02 in the equilibrium layer and temperature T, caused by the correlation due to decomposition of the coating layer. The a01 and a02 can be determined from the electromotive force E1 and E2, which means that aM1 becomes a function of E1, E2 and T. As the oxygen electromotive force E1 is taken in consideration on determination of the activity aM1, accuracy of the measurement is improved. Thereby, the activity of element such as Mn, Cr, etc., in a molten metal can be determined with high accuracy.

2. 发明专利

JPH0278945A PROBE FOR MEASURING ACTIVITY OF SOLUTE ELEMENT IN MOLTEN METAL 失效
公开(公告)号：JPH0278945A
公开(公告)日：1990-03-19
申请号：JP23098488
申请日：1988-09-14
申请人： NIPPON KOKAN KK , OSAKA OXYGEN IND , SASABE MINORU
发明人： SASABE MINORU , HASEGAWA TERUYUKI , ISHIKAWA HIROAKI , KAWAI YOSHIHIKO , FURUTA CHIKAYOSHI , NAGATSUKA TOSHIO , MATSUSHIGE HARUHIKO
IPC分类号： G01N27/411 , G01N27/406 , G01N33/20
摘要： PURPOSE:To allow the measurement of respective electromotive forces with a piece of element by using the element for measuring a solute element formed by coating the outer periphery of a solid electrolyte having oxygen ion conductivity with such a material with which the activity of the oxidation of the solute element to be measured attains a specified value. CONSTITUTION:A counter electrode 1 of the probe for measuring activity is mounted on a housing 10 and is connected to a potentiometer via a connector 11. A standard electrode 2 is consisting of the blinded cylindrical solid electrolyte 4, an Mo wire electrode 6 which is immersed at the front end in a reference material 5 put therein and the connector 11 of which is connected to the potentiometer, and the coating 7 of such material with which the activity aMOX of the oxide MOx of the element M attains the specified value and which is applied on the surface of the electrolyte 4. A 1st equil. part A and a 2nd equil. part B appear in an electromotive force curve upon lapse of time and stabilize thereafter if the probe constituted in such a manner is immersed into a molten metal. The electromotive force E in the equil. part A corresponds to the electromotive force of the solute element in the molten metal and the electromotive force E in the equil. part B corresponds to the oxygen electromotive force in the molten metal.

3. 发明专利

JPH0273148A METHOD FOR MEASURING ACTIVITY OF SOLUTE ELEMENT IN MOLTEN METAL AND MEASURING PROBE 失效
公开(公告)号：JPH0273148A
公开(公告)日：1990-03-13
申请号：JP22433788
申请日：1988-09-07
申请人： NIPPON KOKAN KK , OSAKA OXYGEN IND , SASABE MINORU
发明人： SASABE MINORU , HASEGAWA TERUYUKI , ISHIKAWA HIROAKI , KAWAI YOSHIHIKO , FURUTA CHIKAYOSHI , NAGATSUKA TOSHIO , MATSUSHIGE HARUHIKO
IPC分类号： G01N27/411 , C21C5/28 , C21C5/46
摘要： PURPOSE:To measure the activity aM of a solute element M by charging the probe coated with material the activity of the oxide of which is a function of the solute to be measured even if the activity is not constant into a molten metal. CONSTITUTION:A standard material 5 is inserted into and brought into contact with a cylindrical solid electrolyte 4 and a coating 7 of the oxide MOx of the element M is applied to the outer side thereof to form a standard electrode 2. This material is immersed together with an electrode 1 into the molten metal (a) and the activity aM is determined. The prescribed equation of the activities aM and aMOX is obtd. in accordance with the electromotive force EMF generated in a potentiometer 3 by using the standard formation free energy DELTAGMO-MOx of the reaction when the element M and O2 are in the equil. state and the standard formation free energy DELTAGNO-NOy at the time when the element N of the standard material oxidizes and forms 1mol NOy and the Faraday's con stant. The aM becomes the function of EMF and temp. and can be measured if the aMOx is rounded as the function of the activity aM. The activity of the Mn, Cr, etc., in the molten metal is rapidly measured according to this method.

4. 发明专利

JP2642440B2 失效
公开(公告)号：JP2642440B2
公开(公告)日：1997-08-20
申请号：JP22433788
申请日：1988-09-07
申请人： NIPPON KOKAN KK , OOSAKA SANSO KOGYO KK , SASABE MINORU
发明人： SASABE MINORU , HASEGAWA TERUYUKI , ISHIKAWA HIROAKI , KAWAI YOSHIHIKO , FURUTA CHIKAYOSHI , NAGATSUKA TOSHIO , MATSUSHIGE HARUHIKO
IPC分类号： G01N27/411 , C21C5/28 , C21C5/46

5. 发明专利

JPH10102135A METHOD FOR DESULFURIZING MOLTEN STEEL 失效
公开(公告)号：JPH10102135A
公开(公告)日：1998-04-21
申请号：JP25481496
申请日：1996-09-26
申请人： NIPPON KOKAN KK
发明人： SAKURAI EIJI , KAWASHIMA KAZUTOSHI , MATSUNO EIJU , MURAI TAKESHI , ISHIKAWA HIROAKI , HIDE KANJI
IPC分类号： C21C7/04 , C21C7/06 , C21C7/064 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a method for executing desulfurization of molten steel with only transitory reaction of an agent consisting essentially of CaO. SOLUTION: During tapping the steel, the molten steel is sufficiently deoxidized with Al and [sol.Al] in the molten steel is made to high and successively, lime is further added into a molten steel stream to execute the desulfurization and also, T.Fe+MnO is restrained to =0.050wt%, and the desulfurizing agent of only the lime is added and the lowering of sol.Al is executed under condition of satisfying the following equation with the RH. At the time of being (h) (height of a top-blown lance) 0.625[Mn]+0.625, and at the time of being (h)>1.5m, WAl /F02 >(0.625[Mn]+0.625)×(-0.12h+1.18).

6. 发明专利

JPH05171243A PRODUCTION OF HIGH ALLOY STEEL 失效
公开(公告)号：JPH05171243A
公开(公告)日：1993-07-09
申请号：JP34509991
申请日：1991-12-26
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA HIROAKI , TADA MITSUHIRO , KAJITANI HIDEO
IPC分类号： C21C5/28
摘要： PURPOSE:To effectively utilize the retention heat in a molten iron ladle and to produce a high alloy steel in good thermal efficiency by charging alloy raw material into the empty high temp. molten iron ladle and preheating at the time of producing the high alloy steel by shifting the high alloy molten iron in the molten iron ladle into a converter and executing decarbon-refining. CONSTITUTION:The high alloy molten iron 5 as raw material for the high alloy steel is charged into the top-bottom combined blowing converter 2 and Fe-Si 8 as heat source is charged and oxygen is blown from a top-blowing lance 9, and by oxidizing Si in the Fe-Si, exothermic reaction is executed and the molten iron temp. is raised, and while stirring the molten iron by blowing gas 12 of Ar, etc., from a tuyere at the bottom, the decarbon-refining is executed by the oxygen blowing from the top-blowing lance 9, to produce the high alloy steel 11. The alloy raw material 3 of high carbon Fe-Mn, etc., is charged into the empty molten iron ladle 1, in which the high alloy molten iron 5 has been charged, and after preheating the alloy raw material by the retaining heat, the molten iron 4 is charged and the alloy raw material is melted to make the high alloy molten iron 5, and thereafter, pre- refining for desulfurization, dephosphorization, etc., is executed and the slag is removed and the low S and low P high alloy molten iron 5 is charged into the converter 2 to execute decarbon-refining. By effectively utilizing the retention heat in the molten iron ladle, the high alloy steel can be produced in good thermal efficiency.

7. 发明专利

JPS63238962A TUNDISH FOR CONTINUOUS CASTING 失效
公开(公告)号：JPS63238962A
公开(公告)日：1988-10-05
申请号：JP7164687
申请日：1987-03-27
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA HIROAKI
IPC分类号： B22D11/10 , B22D41/48 , B22D43/00
摘要： PURPOSE:To reduce inclusion in a cast slab by arranging a covering body having airtightness closing an inner part in casting start tube of a tundish and cutting off invasion of outer air into main body. CONSTITUTION:The covering body 5 having airtightness, is inserted at position having the prescribed height in the casting start tube 2 arranged discharging hole 6 in the tundish 1. The covering body 5 composing of flat disk plate, is brought into closely contact with the inner face of the tube at the intermediate position of the tube 3 and the inner part in the tundish 1 is cut off from outer air and also the covering body 5 disappears at the stage of flowing the molten metal into the inner part 4, and after that, the molten metal flow is not disturbed. At the time of casting the molten metal through the tundish 1, as the tundish 1 is perfectly sealed, and held to reducing atmosphere, the inclusion composing of oxide in the cast slab is reduced.

8. 发明专利

JPS6372811A METHOD FOR PREVENTING SLOPPING 失效
公开(公告)号：JPS6372811A
公开(公告)日：1988-04-02
申请号：JP21774186
申请日：1986-09-16
申请人： NIPPON KOKAN KK
发明人： KURIBAYASHI AKIO , HIRANO MINORU , MIYAHARA HIROAKI , ISHIKAWA HIROAKI
IPC分类号： C21C5/28
摘要： PURPOSE:To prevent occurrence of slopping caused by foaming slag by injecting inert gas into the foaming slag generating in a converter from a lance toward horizontal direction at the time of refining molten iron to molten steel in the converter providing a bottom blowing tuyere and the top blowing lance. CONSTITUTION:The molten iron 12 is charged into the converter 10 having the bottom blowing tuyere and slag making material, such as lime, etc., is added and the pure oxygen is blown from the bottom blowing tuyere and also the lance 16 is hung down in the converter to blow the pure oxygen on the surface of molten iron 12 from a nozzle 22 at the tip thereof, and C in the molten iron 12 is oxidized to refine to the molten steel by decarburization. In this case, the foaming slag 14 generated by the refining reaction is blown up by CO gas generated by the decarburizing reaction, to cause slopping. At the time of inserting the lance 16 by the increasing slag volume caused by foaming the viscous molten slag 14, it is detected by the detector. And, the inert gas 19, such as Ar, etc., is injected against the inner wall of converter from side holes 18 on the outer pipe of lance 16 and the oxygen concentration at this portion is reduced, to form reducing slag and the foaming is eliminated, and as CO is easily vented upward on the slag 14, the occurrence of slopping is prevented.

9. 发明专利

JPS59145713A Siphon type slag cutter for blast furnace 失效
标题翻译： SIPHON型烤漆切割机
公开(公告)号：JPS59145713A
公开(公告)日：1984-08-21
申请号：JP1812083
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： C21B7/14
CPC分类号： C21B7/14
摘要： PURPOSE:To prevent the intrusion of molten slag into a ladle for molten iron and to improve the rate of preliminary refining with desulfurization by disposing freely swivelably and rollably a molten iron receiving tank provided with a siphon pipe in the bottom between a tapping spout for molten iron and the ladle for molten iron. CONSTITUTION:A slag cut pot 4 provided with a siphon pipe 5 in the bottom is disposed between an inclined spout 1 and a ladle 3 for molten iron in the stage of receiving the molten iron tapped from a blast furnace in said spout and charging the same through the tap hole 2 thereof into said ladle. The molten iron flowing down from the spout 1 into the pot 4 flows through the pipe 5 in the bottom into the ladle 3. The pressure of molten slag S in the pipe 5 balances with the pressure of molten iron M at the point of the time when the reception in the ladle 3 ends, then the reception into the ladle 3 is automatically stopped after the stop of the tapping from the spout, whereby the intrusion of the slag S into the ladle 3 is prevented and therefore the decrease in the rate of desulfurization in the ladle 3 by the preliminary refining on account of the presence of the molten slag is prevented.
摘要翻译：目的：为了防止熔融炉渣浸入铁水浇包中，并通过在底部自由旋转和可滚动地配置设置有虹吸管的铁水接收罐，在熔融的出料口之间设置脱硫，从而提高初步精炼速度。铁和钢包用于铁水。构成：在底部设置有虹吸管5的炉渣切割盆4设置在倾斜喷口1和铁水包3之间，用于在接收从所述喷口中的高炉敲击的铁水的阶段中接收铁水并对其进行充电通过其排水孔2进入所述钢包。从喷口1向下流到锅4中的铁水流过底部的管道5进入浇包3.管5中的熔渣S的压力与时间点的铁水M的压力平衡当钢包3中的接收结束时，在从喷口停止出料之后自动停止向钢水包3的接收，从而防止了渣S侵入钢包3中，因此，由于熔融渣的存在，通过初步精炼来防止钢包3中的脱硫。

10. 发明专利

JPH10219335A METHOD FOR REFINING HIGH CLEAN EXTRA-LOW SULFUR STEEL 失效
公开(公告)号：JPH10219335A
公开(公告)日：1998-08-18
申请号：JP3144697
申请日：1997-01-31
申请人： NIPPON KOKAN KK
发明人： SAKURAI EIJI , ISHIKAWA HIROAKI , KAWASHIMA KAZUTOSHI , YOSHIOKA KEIJI , NISHIMACHI RIYUUZOU , MURAI TAKESHI , MATSUNO EIJU
IPC分类号： C21C7/04 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide the method for refining a high clean extra-low sulfur steel which is used for a base stock of a line pipe, etc. SOLUTION: (a) During tapping molten steel 3 refined in a converter 1 into a ladle 2, metallic Al is added and [Al] in the steel is controlled to >=0.03% and the adding quantity of Mn base alloy is controlled to =0.1kg pure metallic Al content per kg of the slag. (d) The molten steel is circulated in an RH degassing apparatus 4 while executing the degassing treatment at >=6WH/t stirring energy. Further, it is desirable to add desulfurizing agent 10 into the vacuum vessel during degassing treatment in the RH degassing apparatus 4.

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