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1. 发明专利

JP2535379B2 失效
公开(公告)号：JP2535379B2
公开(公告)日：1996-09-18
申请号：JP12385688
申请日：1988-05-23
申请人： KAWASAKI STEEL CO
发明人： KITAGAWA NOBUKAZU , UEDA ARATA
IPC分类号： C21C5/36

2. 发明专利

JPH0379712A REFINING METHOD IN CONVERTER 失效
公开(公告)号：JPH0379712A
公开(公告)日：1991-04-04
申请号：JP21699389
申请日：1989-08-23
申请人： KAWASAKI STEEL CO
发明人： OMIYA SHIGERU , OSANAI HISASHI , KITAGAWA NOBUKAZU
IPC分类号： C21C5/30 , C21C5/34
摘要： PURPOSE:To improve decarbonizing efficiency without increasing combustion quantity of iron to lower carbon range than the conventional method, to reduce gas cost and to extend service life of furnace lining by specifying blowing of refining gas at the time of executing refining in a converter having double- pipe tuyere. CONSTITUTION:The converter having the double-pipe tuyere at lower part than position of molten steel surface is used and the refining gas is blown into the molten steel from inner pipe in the double-pipe tuyere and also hydrocarbon-based cooling medium for protecting the tuyere is caused to flow into between the inner pipe and outer pipe. In this refining method, pure oxygen gas is blown from the inner pipe as the refining gas at the initial stage of starting the refining and the blowing gas from the inner pipe, at the time of becoming

3. 发明专利

JPH09143546A OXYGEN TOP BLOWING METHOD IN RH DEGASSING EQUIPMENT 失效
公开(公告)号：JPH09143546A
公开(公告)日：1997-06-03
申请号：JP31025495
申请日：1995-11-29
申请人： KAWASAKI STEEL CO
发明人： ANDO KENJI , OKUDA HARUYUKI , KITAGAWA NOBUKAZU , UEHARA HIROHIDE
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To secure the smooth circulating flow of molten steel, to prevent the wear of a refractory and to enable to execute proper hard blow by positioning the center axis of a vertical lance freely elevating/lowering in the range of the inner diameter of a circulating tube and executing oxygen top-blowing refractory. SOLUTION: An uptake tube 6 and a downtake tube 7 in a reduced pressure chamber 2 provided with a gas exhaust system 8 are dipped into the molten steel, and the oxygen-containing gas is top-blown onto the molten steel surface through the vertical lance 1 freely elevating/lowering and inserted from a top cover 3. In an RH degassing equipment, the center axis of the vertical lance 1 is positioned within the range of the inner diameter of the circulating tube and the oxygen-containing gas is ejected therefrom. By this method, the recessed part on the molten steel surface formed by the top-blowing is not formed at the positioned of a bottom part 10 of the degassing equipment and the smooth circulating flow of the molten steel is not obstructed and the wear of the refractory can be prevented. Further, plural opening holes 11 for inserting the vertical lance are arranged in the top cover 3, and it is desirable to suitably select the top-blowing position of the oxygen-containing gas according to the refining objective molten steel.

4. 发明专利

JPH0741815A METHOD FOR COATING SLAG ON FURNACE BOTTOM AND FURNACE WALL SURFACE IN CONVERTER 失效
公开(公告)号：JPH0741815A
公开(公告)日：1995-02-10
申请号：JP18800593
申请日：1993-07-29
申请人： KAWASAKI STEEL CO
发明人： MAKINO MITSUNORI , FUJIMURA TOSHIO , KITAGAWA NOBUKAZU , OMIYA SHIGERU , OKUDA HARUYUKI
IPC分类号： C21C5/44 , F27D1/16
摘要： PURPOSE:To enable easy slag sticking treatment to a knucle part at a trunnion side and reducing of repairing material quantity to a furnace bottom by blowing gas on the slag through a lance arranged at the upper part of the furnace in a method for coating slag on the furnace bottom and a furnace wall surface in a converter by using the remaining slag in the converter after tapping a steel. CONSTITUTION:After blowing molten iron in the converter 1 which can be used to either top blowing or top-bottom combined blowing, and tapping the steel a part of the slag is removed and the slag 2 is made to remain in the furnace. Successively, the lance 3 is descended to a prescribed position from the upper part of the converter 1 and inert gas (nitrogen, argon, mixed gas thereof, etc.) is injected on the slag 2 and the slag is collected to the lower part of the furnace wall (knucle part). Charge of dolomite is started through a chute 6 during this and the m.p. of slag is heightened and the sticking force of the slag to the furnace bottom and furnace wall refractories is improved. Thereafter, the lance 3 is lifted in a little so as to blow the slag upward on the furnace wall.

5. 发明专利

JPH0641626A OXYGEN BLOWING CONTROL METHOD OF CONVERTER 失效
公开(公告)号：JPH0641626A
公开(公告)日：1994-02-15
申请号：JP19806492
申请日：1992-07-24
申请人： KAWASAKI STEEL CO
发明人： KITAGAWA NOBUKAZU
IPC分类号： C21C5/30
摘要： PURPOSE:To improve the hit accuracy of the temperature of molten steel to be tapped into a ladle by modifying the target temperature according to the fluctuation of the amount of the ferro alloy caused by the modification of the carbon concentration when the oxygen blowing control of the converter is executed by a dynamic control model. CONSTITUTION:Necessary amount of the oxygen is calculated to obtain a target temperature and a carbon concentration when the blowing is completed by using a dynamic control model, the oxygen blowing of the converter us executed, and then, the ferro alloy is added during the tapping operation from the converter into the ladle. In this oxygen blowing control method of the converter, when it is estimated that the temperature of the molten steel when the blowing is completed becomes lower than the target value with the calculated amount of oxygen blowing, the target carbon concentration is modified bit by bit downward. In addition, the required amount of the ferro alloy to be added is calculated according to this modification. The target temperature when the blowing is completed is modified based on the temperature decrease of the molten steel in the ladle due to the addition of this amount of ferro alloy. Then, the target carbon concentration is modified downward until this modified target temperature is obtained, and the oxygen blowing is executed. This constitution allows the target ladle temperature of the molten steel to be obtained in a constantly stable manner.

6. 发明专利

JPH03104811A METHOD FOR OPERATING CONVERTER USING PRETREATED MOLTEN IRON 失效
公开(公告)号：JPH03104811A
公开(公告)日：1991-05-01
申请号：JP24163589
申请日：1989-09-18
申请人： KAWASAKI STEEL CO
发明人： OSANAI HISASHI , SUDO FUMIO , KITAGAWA NOBUKAZU
IPC分类号： C21C5/28 , C21C5/46
摘要： PURPOSE:To secure the accurate set steel tapping quantity at a low cost by executing blowing to the steel of excess quantity compared with the set steel tapping quantity and using the excess blown steel to the next blowing in order in the slagless operation by using the pretreated molten iron. CONSTITUTION:At the time of executing the less-slag operation or the slag-less operation in a converter by using the pretreated molten iron completed with dephosphorization and desulfurization, the blowing is executed in the converter so as to make the quantity to be blown 3-15t excess to the set steel tapping quantity. Successively, at the time of completing the blowing, the excess blown steel is allowed to remain in the furnace and scrap for the next heat is charged and blown steel is solidified, and this is used to the blowing at the next time, in order. Then, when oxygen content in the remaining steel in the furnace is high, deoxidizing agent of Si or Al, etc., corresponding to the measured oxygen content is charged to prevent generation of sudden boiling. By this method, the accurate steel tapping quantity is secured and also a cast slab with good quality is obtd.

7. 发明专利

JPH01294814A METHOD FOR REUTILIZING REFINING SLAG 失效
公开(公告)号：JPH01294814A
公开(公告)日：1989-11-28
申请号：JP12385688
申请日：1988-05-23
申请人： KAWASAKI STEEL CO
发明人： KITAGAWA NOBUKAZU , UEDA ARATA
IPC分类号： C21C5/36
摘要： PURPOSE:To recover slag having less phosphorus concn. and to enable reutilization as refining agent by separating and removing liquid phase slag having high phosphorus concn. at the time of being under condition, which is separatable into two phases of the liquid phase and solid phase during solidification of the molten slag. CONSTITUTION:During the solidification of the molten slag discharged from a steelmaking furnace in the slag pan, the phosphorus in the slag is shifted into the liquid phase from the solid phase. Therefore, at the time of being under condition of coexisting the liquid phase and the solid phase, the liquid phase slag condensing the phosphorus is discharged, separated and removed from the slag pan, and only the solid phase slag containing low phosphorus concn. and valuable component of manganese, etc., is recovered and this is reutilized as refining agent, such as slag making agent for converter, pre-treating agent for molten iron.

8. 发明专利

JP2003155515A METHOD FOR PRODUCING MOLTEN HIGH Cr STEEL 审中-公开
公开(公告)号：JP2003155515A
公开(公告)日：2003-05-30
申请号：JP2001355530
申请日：2001-11-21
申请人： KAWASAKI STEEL CO
发明人： KASHIWA TAKAYUKI , NABESHIMA SHIGEYUKI , KITAGAWA NOBUKAZU , KITANO YOSHIHISA , NISHIKAWA HIROSHI
IPC分类号： C21C5/28 , C21C7/00 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a method for producing molten high Cr steel which prevent excessive Cr oxidation and refractory erosion even by using a molten metal holding furnace and can perform a smooth operation of a continuous casting. SOLUTION: Iron source and Cr source are melted under a reducing atmosphere by using a melting furnace for molten high Cr iron, and after holding the obtained molten high carbon and high Cr iron in the molten metal holding furnace provided with a heating means, the necessary quantity of the molten high carbon and high Cr iron is taped off from this molten metal holding furnace to a decarburize-refining facility so as to match with a schedule of a decarburize-refining in the decarburize-refining facility to perform the decarburize-refining. In this case, the obtained molten high Cr steel can be further preferably applied as a finish decarburize-refining in a second decarburize-refining facility having a pressure-reducing function.

9. 发明专利

JP2001059110A METHOD FOR UTILIZING WASTE MATERIAL IN STEELMAKING FURNACE 失效
公开(公告)号：JP2001059110A
公开(公告)日：2001-03-06
申请号：JP23322099
申请日：1999-08-19
申请人： KAWASAKI STEEL CO
发明人： KITAGAWA NOBUKAZU , SUDA MAMORU
IPC分类号： C21C5/28 , C21B11/00 , C21C5/52
摘要： PROBLEM TO BE SOLVED: To effectively utilize waste materials, such as waste belt material, waste wood, and to reduce the operating cost by cutting off the waste belt material or the waste wood into a prescribed length, charging them into a steelmaking furnace as a heat source, utilizing the combustion heat, raising molten steel temp. and executing heat compensation during blowing. SOLUTION: The waste belt material 1 of a belt conveyor or the waste wood, such as wood-made pallet, cut off to about

10. 发明专利

JP2001012731A USING METHOD FOR HEAT STORAGE TYPE BURNER 失效
公开(公告)号：JP2001012731A
公开(公告)日：2001-01-19
申请号：JP18314299
申请日：1999-06-29
申请人： KAWASAKI STEEL CO
发明人： HARA KAZUAKI , ADACHI KAZUNARI , KITAGAWA NOBUKAZU
IPC分类号： B22D11/10 , B22D41/015 , F23D14/66 , F23L15/02 , F23L17/00 , F27B3/20 , F27B3/26 , F27D17/00 , F27D21/00
摘要： PROBLEM TO BE SOLVED: To shorten a time in which temperature is caused to attain a given value by a heat storage burner when heating of a turn dish starts. SOLUTION: Stabilizing burners 15 disposed respectively in combustion chambers 4 of a pair of heat-storage type burners 6 set at a cover 2 for a turn dish are caused to simultaneously effect combustion during a stop of heating of the turn dish which extinguishes the heat-storage type burners 6. Combustion exhaust gas therefrom is guided from the combustion chambers 4 to respective heat storage bodies 3 for heating, and the temperature of the heat storage body 3 is stably held at 500 deg.C.

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