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1. 发明专利

JP2000038613A METHOD FOR REFINING MOLTEN STEEL HAVING SMALL QUANTITY OF DUST UNDER REDUCED PRESSURE 失效
公开(公告)号：JP2000038613A
公开(公告)日：2000-02-08
申请号：JP22233798
申请日：1998-07-21
申请人： NIPPON STEEL CORP
发明人： AOKI HIROYUKI , KIMURA KOHEI
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a refining method of molten steel having small quantity of dust under reduced pressure, in which the development of the dust is little at the time of decarburize-refining under reduced pressure and the sticking and the deposit to a duct etc., in an immersion tube, a vacuum vessel and an exhaust system are prevented and the wearing of refractory is restrained and the stable decarburizing can be executed. SOLUTION: In the refining method of the molten steel under reduced pressure, in which the decarburize-refining is executed under reduced pressure by dipping one piece of immersion tube 13 into the molten steel 12 in a ladle 11, while blowing inert gas from the bottom part 18 in the ladle 11, the pressure in the immersion tube 13 is reduced so that the vacuum degree becomes low vacuum, such as 100-750 Torr, at the initial stage of the decarburize-refining to execute the decarburizing, and then, the decarburizing is executed by reducing the pressure in the immersion tube 13 so that the vacuum degree becomes the high vacuum, such as

2. 发明专利

JPH0938753A TUNDISH FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH0938753A
公开(公告)日：1997-02-10
申请号：JP21127195
申请日：1995-07-28
申请人： NIPPON STEEL CORP
发明人： HIROKAWA YUICHI , KIMURA KOHEI , OTSUKA YOSHIAKI , KASHIO SHIGEKI , ENDO KOICHI
IPC分类号： B22D43/00 , B22D11/10
摘要： PROBLEM TO BE SOLVED: To remove inclusion flowed in accompanied with molten steel from a molten steel supplying nozzle by forming molten steel flowing passage arranging panel-like weir having size satisfying a specific condition as a zigzag state in a tundish for continuous casting. SOLUTION: In the tundish 2 for continuous casting arranging wide lower weirs 1 having flat upper surface in the width direction between the molten steel supplying nozzle 5 for supplying the molten steel from the upper part and a molten steel ejecting nozzle 3 arranged at the bottom part, the panel-like weirs 4 are arranged on the wide lower weirs 1 as the zigzag state in the width direction of the wide lower weirs 1 so that the width length of the panel-like weir 4 becomes 0.5-0.7 times of the width length of the wide lower weir 1 and the height of the panel-like weir 4 becomes 0.4-0.8 times of the height of the wide lower weir 1 to form the molten steel flowing passage. In this result, the inclusion flowed in accompanied with the molten steel from the molten steel supplying nozzle 5 can surely be flowed up and removed in the suitable productivity.

3. 发明专利

JP2000119735A METHOD FOR REFINING MOLTEN IRON HAVING LITTLE IMPURITY UNDER REDUCED PRESSURE 失效
公开(公告)号：JP2000119735A
公开(公告)日：2000-04-25
申请号：JP28680498
申请日：1998-10-08
申请人： NIPPON STEEL CORP
发明人： AOKI HIROYUKI , KIMURA KOHEI , ARAMAKI TAKERO
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a refining method of molten iron having little impurity under reduced pressure, by which copper and tin in the molten iron are efficiently removed in a short time and the wearing of a refractory in a refining apparatus, etc., is restrained. SOLUTION: Into a ladle 11 charging the molten iron 12 having 1.0-4.3 wt.% carbon concn., an immersion tube 13 is dipped and the pressure in the immersion tube 13 is reduced. Further, inert gas is blown into the molten iron 12 at 0.6-6 NL/min.ton of molten iron from the lower part of the molten iron 12 at the position just below the immersion tube 13, and the molten iron 12 is stirred to execute the removals of the copper and the tin.

4. 发明专利

JP2000063930A METHOD FOR REFINING MOLTEN LOW SULFUR STEEL CONTAINING LITTLE NITROGEN 失效
公开(公告)号：JP2000063930A
公开(公告)日：2000-02-29
申请号：JP24779298
申请日：1998-08-17
申请人： NIPPON STEEL CORP
发明人： AOKI HIROYUKI , KIMURA KOHEI
IPC分类号： C21C7/064 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a refining method of molten low sulfur steel containing little nitrogen, with which the increase of consumption of steam, etc., supplied into a booster, etc., used for reduction of the pressure and the lowering of temp. of the molten steel are prevented and the absorption of the nitrogen is restrained. SOLUTION: In the refining method of the molten steel for executing decarburization and degassing-refining by reducing the pressure in an immersion tube 13, while blowing inert gas from the bottom part 18 of a ladle 11 by dipping one piece of the immersion tube 13 into the molten steel 12 in the ladle 11, after executing the decarburization and the degassing-refining, fuel and oxygen-containing gas are supplied into the immersion tube 13 to raise the inner pressure in the immersion tube 13 higher than the atmospheric pressure while burning the fuel, and flux is added into the immersion tube 13 to execute the desulfurizing-refining of the molten steel 12.

5. 发明专利

JP2000034517A METHOD FOR REFINING LOW OXYGEN MOLTEN STEEL 失效
公开(公告)号：JP2000034517A
公开(公告)日：2000-02-02
申请号：JP21640598
申请日：1998-07-14
申请人： NIPPON STEEL CORP
发明人： AOKI HIROYUKI , KIMURA KOHEI
IPC分类号： C21C7/068 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To prevent the contamination of molten steel caused by a strong deoxidizer by dipping a large diameter immersion tube into the molten steel in a ladle, blowing insert gas from a position having deeper position than the immersion position and adding carbonaceous material into the immersion tube at the initial stage of decarburize-refining. SOLUTION: While blowing inert gas into the molten steel 12 from a porous plug 18 at the bottom part 11a of a ladle 11 charging the molten steel 12, the immersion tube 13 is dipped into the depth of about 0.3-0.7 m from the molten steel surface 12a. The immersion tube 13 and the inner part of a vacuum vessel 14 are connected with an ejector and the air therein is sucked through a gas exhaust duct 15 and the pressure therein is reduced to about 0.2-100 Torr to execute the circulation and the stirring of the molten steel 12. At the initial stage of the decarburization-refining during about 0.5-5 min from the start of the decarburization-refining under reduced pressure, the carbon-containing material is discharged from a storing hopper 17 to a chute 16 to add this material at about 0.05-1.0 kg/ton of the molten steel 12 in the immersion tube 13. In this way, the carbon content is extremely raised to positively execute the deoxidation of the molten steel 12.

6. 发明专利

JPH11189818A TREATEMENT OF SHREDDER DUST 失效
公开(公告)号：JPH11189818A
公开(公告)日：1999-07-13
申请号：JP36810797
申请日：1997-12-25
申请人： ASTEC IRIE KK , NIPPON STEEL CORP
发明人： KIMURA KOHEI , SASAKI KENICHI , ISHITA TSUTOMU , ASAKUMA TAKAAKI , SHIGEMIZU TADAO
IPC分类号： F23G7/00 , B09B3/00 , C21C5/28 , C21C5/52
摘要： PROBLEM TO BE SOLVED: To recycle shredder dust by briquetting the shredder dust previously freed from the metallic component and cosisting essentially of hydrocarbonic compds. with the heat of the dust generated when pressed or with an adhesive and adding the briquette to a refining furnace to heat the charge. SOLUTION: The shredder dust is obtained by charging various industrial refuse or domestic refuse into the shredder and removing the metallic component from the shredded material. A material consisting of plastic, rubber, cloth, etc., is exemplified. The dust is easily briquetted by an injection molding machine, etc. In this case, a part of the hydrocarbonic compds. is melted by the frictional heat or self heating and acts as a binder. When the scrap is introduced into the refining furnace in addition to molten iron, the charge is effectively heated by adding the briquette rich in hydrocarbonic compds. even if the charge is not sufficiently heated only by the carbon in the molten iron.

7. 发明专利

JPH0890216A METHOD FOR PREVENTING INCLUSION OF SLAG AT THE TIME OF FLOWING OUT MOLTEN METAL 失效
公开(公告)号：JPH0890216A
公开(公告)日：1996-04-09
申请号：JP24681894
申请日：1994-09-16
申请人： NIPPON STEEL CORP
发明人： KANEKO KATSUSHI , KIMURA KOHEI
IPC分类号： B22D11/10 , B22D11/103 , B22D11/119 , B22D11/18 , B22D37/00 , B22D43/00
摘要： PURPOSE: To restrain the inclusion of slag and to improve the yield of molten metal by reducing molten metal flow-out rate into a receiving vessel from the point of time when the molten metal weighed value in the vessel reaches a prescribed value and further, reducing the flow-out accompanied with the reduction of the molten metal. CONSTITUTION: At the time of detecting the variation of the molten metal wt. with a load cell 9, on which the molten metal remaining quantity in a molten metal holding vessel 1 reaches the prescribed value, the flow rate adjusting device (SN) 5 starts an opening degree contracting movement to reduce the flow-out of the receiving vessel 3 for molten metal. Probability entrapping the slag into the molten metal near a flow-out hole of the SN 5 is reduced by reducing the flow-out rate. The SN 5 continues the flow-out of the molten metal with the preset little quantity of the molten metal with an SN positional detector 8 and finally, the SN 5 is fully opened to complete the flow-out. Since the flow-out is not stopped on the way in such a way, the inclusion of the slag is restrained and the yield of the molten metal can be improved.

8. 发明专利

JPH08103864A FILLING STRUCTURE OF FILLER FOR SLIDING NOZZLE HOLE 失效
公开(公告)号：JPH08103864A
公开(公告)日：1996-04-23
申请号：JP24003194
申请日：1994-10-04
申请人： HARIMA CERAMIC CO LTD , NIPPON STEEL CORP
发明人： KANEKO KATSUSHI , KIMURA KOHEI , EJIRI MITSURU , TAMEHIRO TAIZO , YAMAGUCHI TSUNEO
IPC分类号： B22D41/46 , B22D11/10
摘要： PURPOSE: To improve nozzle hole clogging preventing effect by filling siliceous filler in the upper layer part and the filler made of spherical alumina of the prescribed particle diameter in the lower layer. CONSTITUTION: A siliceous filler is filled in an upper layer part 3 as the filler of a sliding nozzle hole 1. The filler made of spherical alumina of 0.1-5mm particle diameter is filled in a lower layer part 2. The spherical alumina has lower contacting area between particles as compared to crushed one and sintering with the siliceous filler of upper layer part 3 is hard to generate. Alumina has low thermal expansion coefficient as well as low pressing pressure due to thermal expansion. The alumina is of sphere, excellent in fluidity, high in filling rate, further the clearance between particles is small. Thus, penetration of heat flow into between particles is low, the filler in lower layer part is not sintered. Further, the alumina of >=0.1mm particle diameter is floated, there is no inclusion in steel and no cause for contamination of molten steel. Natural opening ratio is about 100%.

9. 发明专利

JPH07132354A METHOD FOR REMOVING INCLUSION IN TUNDISH FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH07132354A
公开(公告)日：1995-05-23
申请号：JP28281693
申请日：1993-11-11
申请人： NIPPON STEEL CORP
发明人： SHIGEMATSU KIYOSHI , HORI SUMIHIRO , KIMURA KOHEI
IPC分类号： B22D11/10 , B22D11/11 , B22D11/112 , B22D11/116 , B22D11/117 , B22D43/00 , C21C7/00
摘要： PURPOSE:To efficiently execute the separation and the removal of non-metallic inclusion in molten metal without making the capacity of a tundish large. CONSTITUTION:In order to improve the removing ratio of the inclusion in the molten metal in the tundish, the theoretical analysis is executed on the relation between the tundish and the removing ratio of the inclusion. In the result, in the case of using the tundish having the shape, in which the depth H in a pouring part and a flow-out part of the tundish is deeper than the depth (h) in a shifting part (H/h>=2) and the ratio (S/L) of a horizontal interval L connecting the pouring hole with the flow-out hole and a shifting part S is made to be >=0.4, the removing ratio of the inclusion is improved by >=1.8 times in comparison with the conventional type of the tundish shape.

10. 发明专利

JPH04131313A METHOD AND APPARATUS FOR DESULFURIZATION 失效
公开(公告)号：JPH04131313A
公开(公告)日：1992-05-06
申请号：JP25295990
申请日：1990-09-21
申请人： IRIE KOSAN KK , NIPPON STEEL CORP
发明人： TAJIMA YUICHIRO , SATO SABURO , SAKOMURA RIYOUICHI , KIMURA KOHEI , YAMASHITA KOSUKE
IPC分类号： C21C1/02
摘要： PURPOSE:To remarkably improve desulfurizing efficiency under a satisfactory working environment and to reduce desulfurizing cost by blowing the specific grain size of CaO granule into molten metal from the lance dipped by the prescribed depth under the specific condition. CONSTITUTION:The CaO granule is blown into the molten iron 11 in a torpedo car 10 with the lance 9 together with carrier gas. Then, >=85%wt.% of CaO powder consists of the powder of 45mum grain size and the desulfurizing treatment is executed under the conditions of >=700mm the dipping depth of lance 9, >=100m/sec gas line velocity and in the range of 4-60kg/min of powder supplying velocity. A conveyor 4 for pressure conveying the granule is communicated to the upper part of a blowing tank 1 in this desulfurizing apparatus through a slice valve 3, and at the lower part thereof, a powder discharge valve 5 which is provided with high chromium planting layer on the inner face of a casing and whose tip part of blade is formed to knife edge-state and in which the side plate is integrally fixed to both ends of the blade is communicated. On the other hand, the lance 9 and the powder discharge valve 5 are communicated through a three-way valve 7 and a guide pipe 8, and also a carrier gas piping 14 is communicated with the above guide pipe 8 through an automatic valve 13.

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