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1. 发明专利

JPH09157731A HOT REPAIRING DEVICE OF CIRCULATING FLOW TUBE AND IMMERSION TUBE AND THE LIKE 失效
公开(公告)号：JPH09157731A
公开(公告)日：1997-06-17
申请号：JP32181895
申请日：1995-12-11
申请人： NIPPON KOKAN KK , KAWASAKI STEEL CO , SUMITOMO METAL IND , KOBE STEEL LTD , SHINAGAWA REFRACTORIES CO
发明人： YAMAMOTO SHINICHI , KAMEMIZU AKIRA , MURAKAMI NAOHIKO , ARIYOSHI MASAHIRO , NANBU MASAO , KUBO YOSHIKAZU , SATAKE YASUSHI , MOTOMA NOBUYUKI , OKAZAKI TOSHIYUKI , ANDO MITSUKAZU , KUROSHIMA HIROSHI
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To automatically execute a spraying repair with prepared unshaped refractory onto the inner and the outer peripheral surfaces and the lower surface of a working objective tube without needing manual operation in the hot-state. SOLUTION: This hot repairing device is provided with a truck 5 arranged so as to be shiftable in the X-Y direction, a rotary table 9 elevatably supported to this truck so as to be rotatably, a supporting arm 22 shiftably supported in the radial direction of the rotating table 9 to this table, a supporting pipe 27 supported as the straight standing state so as to be rolling-rotatably at the tip part of the supporting arm 22, a prepared unshaped refractory spraying nozzle 44 supported so as to face upward/downward at the upper end of this supporting pipe 27 and a facing upward/downward mechanism facing the spraying nozzle 44 upward/downward.

2. 发明专利

JPH09209029A DEVICE FOR REPAIRING IMMERSION TUBE AND CIRCULATING TUBE IN RH VACUUM DEGASSING APPARATUS 失效
公开(公告)号：JPH09209029A
公开(公告)日：1997-08-12
申请号：JP1987696
申请日：1996-02-06
申请人： NIPPON KOKAN KK , KAWASAKI STEEL CO , SUMITOMO METAL IND , KOBE STEEL LTD
发明人： MURAKAMI NAOHIKO , YAMAMOTO SHINICHI , KAMEMIZU AKIRA , NANBU MASAO , ARIYOSHI MASAHIRO , KUBO YOSHIKAZU , SATAKE YASUSHI , MOTOMA NOBUYUKI , OKAZAKI TOSHIYUKI
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To safely and quickly cut and remove metal, slag and refractory on the inner surfaces of immersion tubes and circulating tube in an RH vacuum degassing apparatus. SOLUTION: Whole device is shifted below the immersion tubes 1 by operating a base carriage 17 and a bit 2, upper support 8 and cutting waste chute 9 are risen. At this time, the alignment between the bit 2 and the immersion tube 1 is executed by inclining a guide rail 16. Successively, firstly, the support 8 is held to an immersion tube connecting flange 1a and fixed. Successively, the feeding speed of the bit 2 is matched to the feeding speed at the time of cutting the refractory, and the cutting in the inner surface of the immersion tube 1 with the bit 2 is started. When the rotation stops on the way of cutting, the feeding speed is changed over, and the cutting is again executed to execute the cutting to a prescribed position. The cutting waste discharged during cutting is recovered into a cutting waste bag 12 through a chute 9. After completing the cutting, the bit 2 is lowered and successively, the support 8 and the chute 9 are lowered to complete the work.

3. 发明专利

JPH07316633A METHOD FOR PREVENTING ABSORPTION OF NITROGEN IN RH VACUUM DEGASSING TREATMENT 失效
公开(公告)号：JPH07316633A
公开(公告)日：1995-12-05
申请号：JP10395794
申请日：1994-05-18
申请人： SHINAGAWA REFRACTORIES CO , NIPPON KOKAN KK
发明人： KAMEMIZU AKIRA , TERAOKA TAKUJI , KOMATSU YOSHIMI , TOYODA KOJI , NISHIO HIDEAKI , TAKESHITA YASUO , NAKAISO SHINJI , SHIMIZU HIROAKI
IPC分类号： C21C7/10
摘要： PURPOSE:To perfectly prevent the absorption of nitrogen into molten steel, to restrain the development of spalling phenomenon, crack, shortage of joint, etc., of a refractory forming the inner and the outer cylinders of an immersion tube, to prolong the service life of the immersion tube and to prevent the stickiness of a large quantity of slag to the outer periphery of the non-immersion part of the immersion tube and a flange part by restraining spatter of the slag. CONSTITUTION:At the time of executing vacuum degassing by dipping the immersion tube of an RH vacuum degassing apparatus into molten steel, and inert gas filling member 7 is embedded and arranged at the upper part from the molten steel surface M in the outer periphery of the seal member of the immersion tube, and while holding the pressure at an area of the inert gas filling member higher than the atmosphere, the degassing treatment is executed to the molten steel to be treated to prevent the absorption of the nitrogen in the RH vacuum degassing treatment. Further, in some case, the inert gas filling member is divided and embedded and arranged to the outer periphery of the seal member, and further, the pressure at the area of the inert gas filling member is made to be in the range of 0.1-1MPa.

4. 发明专利

JPH09227927A METHOD FOR PROTECTING LINING REFRACTORY IN VACUUM DEGASSING VESSEL 失效
公开(公告)号：JPH09227927A
公开(公告)日：1997-09-02
申请号：JP3489596
申请日：1996-02-22
申请人： NIPPON KOKAN KK
发明人： SAKURAI EIJI , YOSHIDA MASANORI , KAWASHIMA KAZUTOSHI , TAKASUGI HIDETO , KAMEMIZU AKIRA , TANO MANABU , TAKAOKA TOSHIO , MATSUNO EIJU , MURAI TAKESHI
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a protecting method for lining refractory of a vacuum degassing vessel in an RH degassing equipment. SOLUTION: In the RH degassing equipment, the circulating flow of molten metal is substantially stopped under condition of sucking up the molten metal into the vacuum vessel 1 and refractory protecting agent 6 is added on the molten metal surface in the vacuum vessel 1. Further, the vacuum degree in the vessel is varied and the molten metal surface is gradually lowered and the refractory protecting agent 6 floated up on the molten metal surface is stuck to the surface of the lining refractory of the vacuum vessel 1 to protect the lining refractory with the stuck refractory protecting agent 6.

5. 发明专利

JPH0649524A PRODUCTION OF HIGHLY CLEAN STEEL 失效
公开(公告)号：JPH0649524A
公开(公告)日：1994-02-22
申请号：JP20389992
申请日：1992-07-30
申请人： NIPPON KOKAN KK
发明人： KAMEMIZU AKIRA , INOUE AKIHIKO , KODAIRA SATOSHI , KOMATSU YOSHIMI
IPC分类号： C21C7/00 , C21C7/076
摘要： PURPOSE:To improve the Al2O3 absorbability of ladle slag by decreasing (T, Fe) in the slag of the molten steel tapped from a converter and to suppress the outflow of the ladle slag into a continuous casting tundish. CONSTITUTION:The molten steel is melted in the converter. This molten steel is tapped into the ladle and the slag floating on the molten steel received into the ladle is deoxidized. The molten steel is then subjected to a vacuum degassing treatment. The molten steel is tapped in an undeoxidized state and lime is added to the molten steel under tapping at the time of melting the molten steel in the converter. Metal Al is added as a slag deoxidizing agent to the molten steel to adjust the ratio of the (CaO)/(Al2O3) in the slag to 1.3 to 1.5 right after the addition of the Al and to 0.6 to 0.8 after the vacuum degassing, by which the ladle slag after the vacuum degassing is solidified in the deoxidizing stage of the slag.

6. 发明专利

JPH08311530A DEGASSING REFINING METHOD 失效
公开(公告)号：JPH08311530A
公开(公告)日：1996-11-26
申请号：JP11737295
申请日：1995-05-16
申请人： NIPPON KOKAN KK
发明人： KAMEMIZU AKIRA , FURUNO YOSHIKATSU , FUKUMI JUNICHI , TOYODA KOJI
IPC分类号： C21C7/10
摘要： PURPOSE: To prevent the diffusion of outer air into a vessel and the absorption of nitrogen into molten steel by passing inert gas in a gas passage during RH degassing treatment. CONSTITUTION: The gas passages 43, 44, 45 are formed so as to surround molten steel flowing passages 24a, 25a of a circulating tube 23 in a circulating tube refractories 32, 33 at the upper part from a connecting part of the lower vessel 11 of an RH degassing apparatus 10 and immersion tubes 24, 25. During degassing treatment, the inert gas is passed in the flow rate range of 5-50Nm /hr into the gas passages 43, 45 only in the downtake side refractory. The inner parts of the circulating tube refractories 32, 33 are made in the inert gas atmosphere and the molten steel 5 passed through the molten steel flowing passages 24a, 25a of the circulating tube 23 is shut off from the outer air. Further, at the time of blowing gaseous argon into the molten steel passage 24a from a gas blowing pipe 28, the molten steel 5 is sucked up into the lower vessel 11 from a ladle and thereafter, the molten steel is descended in the other immersion tube 25 and returned back into the ladle from the lower vessel 11.

7. 发明专利

JPH06200311A METHOD FOR DEPHOSPHORIZING MOLTEN IRON 失效
公开(公告)号：JPH06200311A
公开(公告)日：1994-07-19
申请号：JP20793
申请日：1993-01-05
申请人： NIPPON KOKAN KK
发明人： INOUE AKIHIKO , KOMATSU YOSHIMI , KAWAKAMI MASAHIRO , KAMEMIZU AKIRA , KOMATANI MASANORI
IPC分类号： C21C1/02
摘要： PURPOSE:To efficiently and inexpensibly execute the dephosphorization of molten iron by using a converter or a refining furnace provided with a slag separating device. CONSTITUTION:In the converter or the refining vessel 1 having a slag separating device, the prescribed molten iron raw material and refining material are charged and slag of the wt. corresponding to >=1% molten iron treating wt. in the slag 5 generated after the dephosphorize-refining is remained in the converter, etc., and the remaining slag is discharged, and thereafter, the molten iron and the refining material are charged to repeatedly execute the dephosphorizing treatment. Further, when the slag generated at the preceding dephosphorize-refining has the dephosphorizing performance, after executing the dephosphorizing treatment two or more times while discharging the preceding slag to the outside of the refining furnace, the generated slag is partially remained to successively execute the dephosphorizing treatment.

8. 发明专利

JPH0633128A METHOD FOR AUTOMATICALLY STOPPING STEEL-TAPPING IN CONVERTER 失效
公开(公告)号：JPH0633128A
公开(公告)日：1994-02-08
申请号：JP19411892
申请日：1992-07-21
申请人： NIPPON KOKAN KK
发明人： KOMATANI MASANORI , KAMEMIZU AKIRA , KOMATSU YOSHIMI
IPC分类号： C21C5/46
摘要： PURPOSE:To automatically stop steel-tapping from a converter by detecting molten steel height in a ladle and, on the other hand, detecting flow-out of slag in the converter from a steel-tapping hole at the time of tapping the steel in the converter. CONSTITUTION:At the time of tapping the molten steel from the converter, the molten steel surface height in the ladle (a first molten steel surface height in the ladle) to detect whether the slag is flowed out or not from the steel-tapping hole based on raw material charged quantity and the molten steel surface height (a second molten steel surface height in the ladle) to stop the steel-tapping, are calculated, respectively. While detecting the molten steel surface height in the ladle and whether the slag is flowed out or not from the steel-tapping hole, when the molten steel surface height in the ladle becomes to the first molten steel surface height or higher in the ladle and the slag is detected or when the molten steel surface height becomes the second molten steel surface height or higher, the steel-tapping is stopped. By this method, at the time of tapping the molten steel from the converter, the flow-out of the slag into the ladle and the overflow of the molten steel, etc., from the ladle can automatically be prevented, thus contributing to the automation of steelmaking operation.

9. 发明专利

JPH0559419A METHOD FOR DEPHOSPHORIZING MOLTEN IRON 失效
公开(公告)号：JPH0559419A
公开(公告)日：1993-03-09
申请号：JP24829491
申请日：1991-09-02
申请人： NIPPON KOKAN KK
发明人： INOUE AKIHIKO , KAMEMIZU AKIRA
IPC分类号： C21C1/02
摘要： PURPOSE:To provide a dephosphorizing method for molten iron executing efficient dephosphorization with the necessary lower limit of adding quantity of soda ash. CONSTITUTION:At the time of executing the dephosphorizing treatment by adding flux composed of gaseous oxygen, solid oxygen source, lime and soda ash, and slag melting accelerator into the molten iron beforehand reducing Si content to =0.35Nm per 1kg of the soda ash. By this method, the dephosphorization is efficiently executed with the necessary lower limit of the adding quantity of the soda ash.

10. 发明专利

JP2000119732A MELTING METHOD FOR HIGH CLEANLINESS EXTRA-LOW CARBON STEEL 失效
公开(公告)号：JP2000119732A
公开(公告)日：2000-04-25
申请号：JP28487698
申请日：1998-10-07
申请人： NIPPON KOKAN KK
发明人： KOMATSU YOSHIMI , NAKAJIMA HIROHISA , TANAKA HIDESHIGE , KAMEMIZU AKIRA
IPC分类号： C21C7/00 , C21C7/068 , C21C7/076 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To reduce particularly alumina base non-metallic inclusion by satisfying each specific condition before and after Al deoxidizing treatment of molten steel in the following process with respect to slag after reforming in a third process. SOLUTION: In the third process, after completing the tapping of molten steel, a reducing agent is added into new slag formed by consisting of the slag inevitably flowing into a ladle during tapping the molten steel and lime charged into the ladle to reform the new slag. In the following process, a vacuum decarburizing treatment and the deoxidizing treatment are applied to the molten steel in the ladle covering the upper surface with the reformed slag by using a vacuum degassing apparatus. At this time, the slag before deoxidizing treatment, is regulated to in the range of 3.0-7.0 basicity shown with CaO/SiO2 and in the range of 30-45% Al2O3 content shown by Al2O3/(Al2O3+SiO2+ CaO)}×100(%) and the slag after deoxidizing treatment, is regulated to

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