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1. 发明专利

JPH1047491A SEAL DEVICE 失效
公开(公告)号：JPH1047491A
公开(公告)日：1998-02-20
申请号：JP20060596
申请日：1996-07-30
申请人： KAWASAKI STEEL CO , CHUGAI RO KOGYO KAISHA LTD
发明人： NAKAGAWA FUTAHIKO , HARA KAZUAKI , YAMAGUCHI RYUSUKE , NAGAI KIYOKAZU , KITAMURA TAMOTSU
IPC分类号： F16J15/14 , B22D11/10 , B22D11/106
摘要： PROBLEM TO BE SOLVED: To provide a seal device suitable for use between a tundish and a regenerative preheater of a non-oxidizing heating device which are repeatedly connected to or separated from each other. SOLUTION: An insertion pipe 7B or 7A is projected from a combustion chamber 4B or 4A of a regenerative preheater 2B or 2A connected to a tundish 1, and between the bottom face of the combustion chamber 4B or 4A formed by the lower end face of the insertion pipe 7B or 7A and the top face of a lid 1a of the tundish 1, a ring-shaped baggy heat-resistant tube member 501 is disposed which is made of flexible noncombustible cloth and has content volume larger than the sealed volume defined by the bottom face of the combustion chamber 4B or 4A and the top face of the lid 1a. The heat-resistant tube member 501 is then supplied through heating with N2 for its inflation and is brought into close contact with the bottom face of the combustion chamber 4B or 4A and the top face of the lid 1a to thereby ensure the airtightness between the regenerative preheater 2B or 2A and the tundish 1.

2. 发明专利

JPH08297110A ESTIMATING METHOD FOR AL CONCENTRATION IN MOLTEN STEEL 失效
公开(公告)号：JPH08297110A
公开(公告)日：1996-11-12
申请号：JP12723995
申请日：1995-04-27
申请人： KAWASAKI STEEL CO
发明人： YAMAGUCHI RYUSUKE , KUROSE YOSHIKAZU
IPC分类号： G01N27/411 , G01N33/20
摘要： PURPOSE: To estimate the Al concentration in molten steel by obtaining the correlation between the Al concentration and oxygen potential in the molten steel in advance, and measuring the oxygen potential in the molten steel with an oxygen concentration battery using a solid electrolyte. CONSTITUTION: Molten steel having the Al concentration 0-65×10 % is prepared, and the electromotive force of the molten steel is obtained by an oxygen concentration battery using a solid electrolyte. The correlation between the electromotive force and the Al concentration in the molten steel is obtained as a regression straight line. The electromotive force is considered as the oxygen potential, the correlation of the electromotive force against the Al concentration in the molten steel is very similar to the straight line, and the Al concentration in the molten steel can be practically easily estimated from it. The difference between the Al concentration estimated from the regression straight line and the actually measured value is about the Al concentration ±6×10 % at the maximum. The Al concentration can be accurately estimated according to this correlation.

3. 发明专利

JPH07166228A METHOD FOR CONTROLLING ULTIMATE CARBON CONCENTRATION OF MOLTEN STEEL BY RG DEGASSING 失效
公开(公告)号：JPH07166228A
公开(公告)日：1995-06-27
申请号：JP31146593
申请日：1993-12-13
申请人： KAWASAKI STEEL CO
发明人： YAMAGUCHI RYUSUKE , HIWASA SHOICHI
IPC分类号： C21C7/10
摘要： PURPOSE:To smelt an extra-low carbon steel with a high hit rate without superdecarburization by an RH degassing treatment. CONSTITUTION:A waste gas quantity is measured by using a gas flow meter disposed in a waste gas duct during the decarburization treatment of molten steel in a vacuum chamber. The carbon concn. at the point of this time is estimated from a difference in the waste gas flow rate which is a difference between the measured waste gas quantity and the actual waste gas quantity at the time of ending the decarburization by the latest RH degassing treatment. Sampling of the molten steel is executed and the carbon concn. [C1] is measured by an analysis in the stage when the estimated carbon concn. falls below 50ppm. A coefft. Kc1 of a decarburization speed is determined in accordance with a correlative relation between the carbon concn.[C] of the molten steel in a region below the carbon concn. of 50ppm previously determined from the measured carbon concn. [C1] and the coefft. KC of the decarburization speed. The treatment time (t) from the point of the time of sampling and until the end point of the decarburization is determined by the equation: t=-1n([Cr]/[Cl])/KC1 using the coefft. KC1 of the decarburization speed, the measured carbon concn. [C1] described above and the objective ultimate carbon concn. [CT].

4. 发明专利

JP2000054015A METHOD FOR PROLONGING SERVICE LIFE OF MOLTEN IRON VESSEL 失效
公开(公告)号：JP2000054015A
公开(公告)日：2000-02-22
申请号：JP22281698
申请日：1998-08-06
申请人： KAWASAKI STEEL CO
发明人： YAMAGUCHI RYUSUKE , KAMO MOMOKI
IPC分类号： C21C7/00 , C21C1/06 , F27D1/00
摘要： PROBLEM TO BE SOLVED: To provide a method for prolonging the service life of a molten iron vessel, in which the large effect is obtd. at a low cost by actively using aluminum ash as erosion preventing agent. SOLUTION: The bed of the molten iron vessel lined with refractory brick 3 is covered with the aluminum ash 1. On the working surface side of the aluminum ash, Al2O3-SiO2 sintered layer 2 in the aluminum ash components is formed with the radiation heat in the molten iron vessel and also, it is considered that AlN formed by reacting the metallic Al in the aluminum ash and the air has the molten iron resistance and the erosion of the refractory brick 3 on the bed is prevented. In this way, the service life of the molten iron vessel having 630-680 charges in the conventional method, can be extended to 1000-1100 or more charges the service life of the molten metal vessel.

5. 发明专利

JPH09295126A NONOXIDATIVE HEATING METHOD 失效
公开(公告)号：JPH09295126A
公开(公告)日：1997-11-18
申请号：JP10992696
申请日：1996-04-30
申请人： KAWASAKI STEEL CO
发明人： HARA KAZUAKI , NAKAGAWA FUTAHIKO , YAMAGUCHI RYUSUKE , HASHIMOTO SHINJI
IPC分类号： F23L15/02 , B22D11/10 , B22D41/015 , F27D7/06
摘要： PROBLEM TO BE SOLVED: To effectively heat the inner part of a tundish by restraining and preventing oxygen from flowing into the tundish to be heated. SOLUTION: N2 being an inert gas is heated by being passed from either one of two heat regenerative preheaters 2A, 2B connected to the tundish 1 and charged into the tundish 1, and N2 is sucked from the other preheater, a heat reservoir is heated by combustion burners 5A, 5B, and the N2 is exhausted together with the combustion exhaust gas as the exhaust gas. At the time of heating the tundish 1 with convective heat transmission of the high temp. N2 by alternately repeating this operation, in order to restrain and prevent the flow-in of O2 contained in the combustion exhaust gas and the atmospheric air, even in the case of reducing the combustion exhaust gas when switching the charging/suction of N2 , the charging N2 flow rate is increased, the exhaust gas flow rate is reduced, or dilute gas flow rate is increased, for example, so that the suction N2 flow rate becomes less than the charging N2 flow rate by a prescribed value to maintain the positive pressure in the tundish 1.

6. 发明专利

JPH09295125A NONOXIDATIVE HEAT INSULATING METHOD FOR TUNDISH 失效
公开(公告)号：JPH09295125A
公开(公告)日：1997-11-18
申请号：JP10992596
申请日：1996-04-30
申请人： KAWASAKI STEEL CO
发明人： NAKAGAWA FUTAHIKO , YAMAGUCHI RYUSUKE , OSANAI HISASHI , HASUNUMA JUNICHI , YAMAMOTO TAKEMI , HARA KAZUAKI
IPC分类号： F23L15/02 , B22D11/10 , B22D41/015 , F27D7/06
摘要： PROBLEM TO BE SOLVED: To prevent the oxidation of residual steel by eliminating the conventional preheating for burning combustion gas in a tundish and to prolong the waitable time until the tundish is reused. SOLUTION: At the time of reusing the tundish 1 in which the steel is remained on the inner wall, N2 being inert gas is heated by being passed from either one of two heat regenerative preheaters 2A, 2B provided at the outer part of the tundish 1 and charged into the tundish 1, N2 is recycled from the other preheater and also, a heat reservoir is heated by combustion burners 5A, 5B. This operation is alternately repeated and the tundish 1 is heated with convective heat transmission of the high temp. N2 passing through the tundish 1 and held to the temp. to be castable. Further, trace amount of H2 of the explosion limit or below is added into the inert gas N2 to make the tundish 1 into the reducing atmosphere and even the residual steel already oxidized is reduced, thus the producing of Al2 O3 is restrained and prevented. Further, the supplying/exhausting gas amount is controlled so as not to become negative pressure in the tundish 1.

7. 发明专利

JPH08159664A METHOD FOR NON-OXIDATION HEATING IN FURNACE 失效
公开(公告)号：JPH08159664A
公开(公告)日：1996-06-21
申请号：JP30004494
申请日：1994-12-02
申请人： KAWASAKI STEEL CO
发明人： NAKAGAWA FUTAHIKO , YAMAGUCHI RYUSUKE , OSANAI HISASHI
IPC分类号： B22D11/10 , B22D41/015 , C04B28/06 , C21D1/34 , C21D1/74 , F27B9/10 , F27D7/06
摘要： PURPOSE: To obtain a method for non-oxidation heating in a furnace which can prevent completely oxidation of a material to be heated in the furnace. CONSTITUTION: Inactive gas of high temperature obtained by repeating an operation of heating the inactive gas to a prescribed temperature while switching over a plurality of regenerative preheaters 2 alternately is supplied into a furnace continuously. It is possible also to recirculate part of the inactive gas of high temperature supplied into the furnace, by a fan for circulation, for instance, and to reuse it for heating in the furnace. As for the furnace necessitating an non-oxidation atmosphere, a tundish 1 or an annealing furnace can be mentioned as an object. The inactive gas is preferably N2 gas or Ar gas in the case when it is applied to the tundish, while it is preferably HN gas when applied to the annealing furnace.

8. 发明专利

JPH08155599A METHOD FOR HOLDING HEAT UNDER NONOXIDATION IN TUNDISH 失效
公开(公告)号：JPH08155599A
公开(公告)日：1996-06-18
申请号：JP30004594
申请日：1994-12-02
申请人： KAWASAKI STEEL CO
发明人： NAKAGAWA FUTAHIKO , YAMAGUCHI RYUSUKE , OSANAI HISASHI , HASUNUMA JUNICHI , YAMAMOTO TAKEMI
IPC分类号： B22D11/10 , B22D41/015
摘要： PURPOSE: To provide a nonoxidation heat holding method in a tundish, in which the preheating such as combustion in the tundish with fuel gas is omitted, the oxidation of remained steel can perfectly be prevented and also, the waiting permissible time till reusing the tundish can be extended. CONSTITUTION: At the time of reusing the tundish 1 remaining the steel on the inner wall, the inner part of the tundish 1 is heated by using inert gas heated at least at >=850 deg.C with a heating means 2 at the outer part of the tundish 1 and then, the tundish temp. during waiting is held to the castable temp. and this tundish is supplied to use in the following heating.

9. 发明专利

JPH06192724A METHOD FOR CONTROLLING CARBON CONCENTRATION AT END POINT IN RH DEGASSING TREATMENT 失效
公开(公告)号：JPH06192724A
公开(公告)日：1994-07-12
申请号：JP34590992
申请日：1992-12-25
申请人： KAWASAKI STEEL CO
发明人： YAMAGUCHI RYUSUKE , MIZUFUJI MASATO , HIWASA SHOICHI
IPC分类号： C21C7/00 , C21C7/068 , C21C7/10
摘要： PURPOSE:To shorten decarburizing treatment time by quickly and precisely estimating the carbon concn. attainment in an extra low carbon steel having a specific value or lower of carbon concn. CONSTITUTION:Exhaust gas quantity is measured by using a gas flow meter 8 arranged an exhaust gas duct 7 during the decarburizing treatment of the molten steel 2 in a vacuum vessel 5. From the exhaust gas flowing difference between this measured exhaust gas quantity and the actual exhaust gas quantity at the completion of the decarburization by RH gas treatment in immediate neighborhood, the carbon concn. is estimated at this point. After confirming that this estimated carbon concn. has attained the aimed carbon concn., the decarburizing treatment is completed. By this method, since the carbon concn. can directly be estimated from the exhaust gas quantity, quick refining is obtd.

10. 发明专利

JP2001140035A HIGH STRENGTH COLD ROLLED STEEL SHEET EXCELLENT IN DUCTILITY AND STRETCH-FLANGING PROPERTY AND PRODUCING METHOD THEREOF 失效
公开(公告)号：JP2001140035A
公开(公告)日：2001-05-22
申请号：JP32703199
申请日：1999-11-17
申请人： KAWASAKI STEEL CO
发明人： OSAWA KAZUNORI , SAKATA TAKASHI , FURUKIMI OSAMU , YAMAGUCHI RYUSUKE
IPC分类号： C21D9/46 , C21D8/04 , C22C38/00 , C22C38/14 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To produce a high strength cold rolled steel sheet having excellent ductility and strength-flanging properties and suitable as the stock for automotive parts. SOLUTION: This steel sheet has a composition containing, by mass, 0.05 to 0.2% C, 0.5 to 3.0% Si, 0.6 to 3.0% Mn, =30 volume %, retained austenite of >=2 volume % and a low temperature transformed phase, in which the average crystal grain size of the above ferrite is moreover controlled to =0.05.

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