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1. 发明专利

JP2001286993A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JP2001286993A
公开(公告)日：2001-10-16
申请号：JP2000096165
申请日：2000-03-31
申请人： KAWASAKI STEEL CO
发明人： TAKAHASHI KIYOSHI
IPC分类号： B22D11/10
摘要： PROBLEM TO BE SOLVED: To provide a continuous casting method by which the defects on the below the surface in the vicinity of the center in the width direction of a cast slab are reduced without lowering the service life of a nozzle or increasing the defects on and below the surface in the vicinity of the edge parts in the width direction of the cast slab. SOLUTION: In the continuous casting method using the immersion nozzle, the horizontal cross sectional shape of the outer shape of the immersion nozzle 1A disposed below the molten metal surface in a mold or the outer shape of a straightening plate 1B fitted to the immersion nozzle is formed asymmetrically with respect to the center line 11 in the longitudinal direction of the mold.

2. 发明专利

JP2000210758A CONTINUOUS CASTING METHOD AND MOLD FOR CONTINUOUS CASTING 失效
公开(公告)号：JP2000210758A
公开(公告)日：2000-08-02
申请号：JP1655799
申请日：1999-01-26
申请人： KAWASAKI STEEL CO
发明人： IWATANI AKIYUKI , TAKAHASHI KIYOSHI
IPC分类号： B22D11/04 , B22D11/055
摘要： PROBLEM TO BE SOLVED: To stably produce a slab having a reduced surface defect by arranging a heat pipe, in which a prescribed working fluid is filled under a reduced pressure, in the mold of a mold upper part so that the mold is not eroded from molten metal and powder to prolong a life. SOLUTION: A mold 1 is cooled by a water cooling groove 31. A heat pipe 5 is constituted by arranging a hole in the mold of the mold 1 upper part and filling a working fluid in the hole and sealing the hole with a plug 11. The heat pipe 5 is arranged to the mold upper part not exceeding 30-70 mm below a molten metal surface level 10. A dimension, shape, the number of pipes, pitch, working fluid of the heat pipe 5 are preferably selected so that the surface temp. of a mold inner face within 30 mm in the up/down direction from the molten metal surface level 10 exceeds 70% of the max surface temp. of the mold inner face and is the allowable temp. of the mold 1 or lower. Mercury and Thermex(R) in which the boiling point is close to the temp. of the mold 1, is used for the working fluid.

3. 发明专利

JP2000202584A CONTINUOUS CASTING METHOD AND MOLD FOR CONTINUOUS CASTING 失效
公开(公告)号：JP2000202584A
公开(公告)日：2000-07-25
申请号：JP885299
申请日：1999-01-18
申请人： KAWASAKI STEEL CO
发明人： TAKAHASHI KIYOSHI , IWATANI AKIYUKI , IMASHIRO MOTOHIRO
IPC分类号： B22D11/04 , B22D11/055 , B22D11/059
摘要： PROBLEM TO BE SOLVED: To provide a continuous casting mold having long service life, with which molten metal near the molten metal surface level can slowly be cooled and a cast slab having little surface defect can be produced and even in the case the molten metal surface level rises, the breakout and the damage of a mold are not caused. SOLUTION: Relating to this continuous casting mold, a low thermal conductivity layer 5 of

4. 发明专利

JPH11117011A REFINING OF MOLTEN METAL USING SLAG 失效
公开(公告)号：JPH11117011A
公开(公告)日：1999-04-27
申请号：JP28165597
申请日：1997-10-15
申请人： KAWASAKI STEEL CO
发明人： TAKAHASHI KIYOSHI
IPC分类号： C22B9/10 , C21C1/02 , C21C7/00 , C21C7/076
摘要： PROBLEM TO BE SOLVED: To increase the reaction interface area between slag and molten metal and to accelerate the refining of the molten metal with the slag by stirring and mixing the floated-up slag and the molten metal in a molten metal vessel. SOLUTION: A cylindrical body 3 for dipping up, opening in the vertical direction is dipped into the molten metal 2 incorporated in the molten metal vessel 1 from the upper part. A flow-out opening hole 4 arranged at the upper side wall is positioned at a part above the surface of molten slag 5 existing on the molten metal 2, and gas is supplied into the molten metal 2 near just below the cylindrical body 3 for dipping up from a lance 6 for blowing the gas. The bath surface in the cylindrical body 3 for dipping up is made to be higher than the bath surface in the molten metal vessel 1, and also, the molten metal 2 is shifted to the upper part by the gas lift pumping action of rising bubble 7 and flowed out from the flow-out opening hole 4 to promote the mixing of the molten metal with the slag 5 existing in the molten metal vessel 1.

5. 发明专利

JPH1180828A IMMERSION TUBE IN DEGASSING EQUIPMENT 失效
公开(公告)号：JPH1180828A
公开(公告)日：1999-03-26
申请号：JP24524797
申请日：1997-09-10
申请人： KAWASAKI STEEL CO
发明人： YOKOYAMA MITSUNOBU , TAKADA SHIGENOBU , TAKAHASHI KIYOSHI , TANAKA MASATO
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To extend the service life of an immersion tube by improving the cooling of a core metal forming the immersion tube in a degassing equipment. SOLUTION: Cooling water is supplied into a water supplying tube 14 by driving awater supplying pump 19, and after promoting the cooling of double tube core metals 13 and a refractory 3 by flowing the cooling water into a cooling water piping 17 arranged in the gap of the double tube core metals 13, the cooling water is drained from a drainage pipe 10. Since the cooling water is used as the cooling medium, the cooling capacity can drastically be increased. Further, since the cooling of the double tube core metals 13 is executed by supplying the cooling gas into the gap of the double tube core metals 13 from a cooling gas supplying tube, the extension of the service life of the immersion tube 10 is achieved. In the case the cooling water piping 17 breaks from happening, the steam developed caused by water breakage is quickly escaped to the outer part through a gas exhaust opening hole 16 to prevent the steam explosion. Further, the steam in the cooling water piping 17 is escaped to the outer part through a safety valve 21 arranged in each of the water supplying pipe 14 and the drainage pipe 15.

6. 发明专利

JPH10110209A EQUIPMENT FOR TRANSPORTING MOLTEN METAL 失效
公开(公告)号：JPH10110209A
公开(公告)日：1998-04-28
申请号：JP26681896
申请日：1996-10-08
申请人： KAWASAKI STEEL CO
发明人： MIKUNI MASATO , TAKAHASHI KIYOSHI
IPC分类号： C21C1/06
摘要： PROBLEM TO BE SOLVED: To enlarge the vol. of a vessel and to quickly discharge the content in the vessel by arranging an opening hole for receiving molten metal at the centeal part in the shifting direction of the vessel and supporting the bearings of the vessel so as to be freely elevated/lowered. SOLUTION: A transporting equipment of the molten metal is provided with the vessel 1 opening the opening hole 8 for receiving the molten metal at the center part 2 in the shifting direction and having shafts 4 along the straight line at both ends crossed with the straight line extended in the shifting direction. The bearings 5 of the shafts 4 are supported so as to be freely elevated/lowered with an elevating/ lowering means 7 arranged to a carrier 6. The inclination downward to the right side can be formed at the lower part of the furnace body 1 by tilting the vessel (furnace body) 1 at the time of discharging the molten iron to form the supporting height of the left shaft to higher than the supporting height of the right shaft with an elevating/lowering means 7, and the molten iron and slag, etc., at the left end part of the furnace body 1 is smoothly flowed down to the opening hole 8 and discharged. At the time of discharging the molten iron and slag, etc., at the right end part of the furnace body 1, the furnace body may be tilted downward to the left side. By this constitution, the vessel shape can be selected without restricting discharging ability of the molten metal.

7. 发明专利

JPH083625A GAS BLOWING NOZZLE FOR VESSEL FOR REFINING MOLTEN METAL 失效
公开(公告)号：JPH083625A
公开(公告)日：1996-01-09
申请号：JP13445794
申请日：1994-06-16
申请人： KAWASAKI STEEL CO
发明人： MIKUNI MASATO , TAKAHASHI KIYOSHI
IPC分类号： C21C7/072 , F27D3/16
摘要： PURPOSE:To obtain the subject gas blowing nozzle which does not generate molten metal penetration at the time of stopping gas blowing by using a porous material having air permeability for the refractories of the gas blowing nozzle formed by loading plural pieces of small-diameter metallic pipes into the refractories enclosed with a metallic outside frame. CONSTITUTION:The nozzle 14 for blowing the bottom blowing gas of a top and bottom blown converter is constituted by forming the refractories 2 enclosed with the metallic outside frame 3 made of the porous material and loading plural pieces of the small- diameter metallic pipes 1 into the refractories 2. A gas supply pipe 4 for supplying the active gas or inert gas 10 is connected to the small-diameter metallic pipes 1 via a gas accumulation chamber 5. The bottom of the porous refractories 2 is connected to the gas supplying pipe 8 of the cooling gas or inert gas 9 via a separated gas accumulation chamber 7. The variable range of the flow rate of the blowing gas is equal to the variable range of the conventional nozzles, but the generation of the molten metal penetration at the time of stopping the gas blowing is prevented by using such gas blowing nozzle 14. In addition, the gas blowing nozzle 14 of the vessel for refining the molten metal which is excellent in terms of life and production cost is obtd.

8. 发明专利

JPH07166222A OPERATION OF ELECTRIC FURNACE 失效
公开(公告)号：JPH07166222A
公开(公告)日：1995-06-27
申请号：JP30898593
申请日：1993-12-09
申请人： KAWASAKI STEEL CO
发明人： TAKAHASHI KIYOSHI , TAKASHIBA NOBUMOTO
IPC分类号： C21C5/52
摘要： PURPOSE:To improve the productivity of operation in an electric furnace and reduce various kinds of the unit consumptions by automatically measuring and controlling slag-foaming height in on-line at the time of refining a steel in the electric furnace. CONSTITUTION:A distance sensor 1 for measuring the distance (l1) between a furnace roof and the slag surface is arranged at the furnace roof 2 in the electric furnace 3. The slag surface height (l2) during the operation in the electric furnace 3 is treated with a data operation processor 21 and calculated by always measuring the (l1) value in the refining period, and by using the distance to the steel bath 18 surface measured at the initial stage of the operation as the reference. In the case the foaming slag 14 during the operation does not cover the arc 19, the carbon powder is automatically added from a blowing hopper 16 so that the measured foaming slag height (l1) corresponds to the objective value of the preset arc length. Further, in the case the slag 14 excessively covers the arc 19, aluminum ash is added to reduce the foaming height. By this method, the suitability of charged voltage in the refining period and the improvement of the productivity, etc., are obtd.

9. 发明专利

JPH0650666A BODY STRUCTURE FOR ELECTRIC FURNACE 失效
公开(公告)号：JPH0650666A
公开(公告)日：1994-02-25
申请号：JP30675391
申请日：1991-10-25
申请人： KAWASAKI STEEL CO
发明人： TAKASHIBA NOBUMOTO , TAKAHASHI KIYOSHI
IPC分类号： C22B7/00 , F27B3/08
摘要： PURPOSE:To reduce an operation cost and a facility cost by specifying a diameter and a height of a shell of a body of an electric furnace for melting and refining scraps by continuously charging the scraps. CONSTITUTION:A diameter D and a height H of a body of an electric furnace for melting and refining scraps by continuously charging the scraps are set to 2.75 or more of a ratio D/H. Even in both side and upper charging types of the scraps, a charging amount of the scraps per unit time is substantially equal to a melting amount of the scraps per unit time, i.e., an increasing amount of molten steel 10. Thus, a component of the steel 10 becomes a predetermined component, and the steel 10 contained in a body 6 is tapped at a time point when a weight of the steel 10 contained in the body 6 reaches a predetermined amount. Thus, an operation cost and a facility cost can be reduced.

10. 发明专利

JPH05148527A SAMPLING DEVICE FOR MOLTEN STEEL 失效
公开(公告)号：JPH05148527A
公开(公告)日：1993-06-15
申请号：JP31677991
申请日：1991-11-29
申请人： KAWASAKI STEEL CO
发明人： TAKAHASHI KIYOSHI , TAKASHIBA NOBUMOTO , ARIYOSHI MASAHIRO
IPC分类号： C21C5/46
摘要： PURPOSE:To obtain a molten steel sampling device suppressing interference of a probe and a probe inserting hole. CONSTITUTION:At the upper part of standing support 2, the inner end part side of a swing arm 3 is hinged swingablly, and to the upper part at the inner end part of this swing arm 3, a swing device 4 constituting a swing means for swinging this swing arm 3 is fixed. At a projecting part of the swing arm 3, the probe 5 is supported. In this support, the probe 5 is penetrated slidably in a through hole at the outer end part of this swing arm 3, and in one end surface of this probe 5, a rack is formed along the longitudinal direction, and a pinion engaged with this rack is fixed rotatably to the inner part at the outer end part of the swing arm 3. At the tip part of the probe 5, a temp. measuring sensor 7 and a molten metal sampler 8 are fitted.

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