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1. 发明专利

JPH07316623A LANCE FOR BLOWING POWDERY RAW MATERIAL INTO CONVERTER 失效
公开(公告)号：JPH07316623A
公开(公告)日：1995-12-05
申请号：JP11552294
申请日：1994-05-27
申请人： KAWASAKI STEEL CO
发明人： KUROKI TAKASHI , HASHIMOTO NAGAHITO , HAMADA SHUNJI , TAOKA KEIZO , NABESHIMA YUKI
IPC分类号： C21C5/46 , F27D3/18
摘要： PURPOSE:To provide a lance for blowing powdery raw material into a converter, resolving the problems, such that, as the hardness of the powdery raw material of chromium ore, etc., charged into the converter is high, a wear resistant material is lined on the inner wall surface of the blowing lance, but particularly the tip part of the lance develops remarkable wear because the flow speed of the raw material is fast, and thus, the service life is shortened, and further, the maintenance requires large labors. CONSTITUTION:A cylindrical wear resistant material 2 is arranged on the inner peripheral surface 1a at the tip end part of the metallic lance 1 so as to be attachable/detachable by screwing from the tip end part of the lance 1.

2. 发明专利

JPH10102126A TUYERE BRICK 失效
公开(公告)号：JPH10102126A
公开(公告)日：1998-04-21
申请号：JP25931696
申请日：1996-09-30
申请人： KAWASAKI STEEL CO
发明人： NAKAZAWA DAICHI , HASHIMOTO NAGAHITO , SUZUKI HAJIME , TATENO SHIGEO
IPC分类号： C21C5/48 , C21C7/072 , F27B1/16
摘要： PROBLEM TO BE SOLVED: To prevent the float-up and the break-down of a tuyere brick caused by vibration at the time of fitting a plug by forming the tuyere brick over to the whole length in the range from the working surface contacting with molten metal to the surface contacting with an iron shell and arranging a projecting part in the end part at the iron shell side. SOLUTION: The tuyere brick 10 is integrally formed over to the whole length in the range from the working surface 11 contacting with the molten metal to the surface contacting with the iron shell 5, and the projecting part 10a projected on the outer periphery, is formed in the end part at the iron shell 5 side. Since the tuyere brick 10 is bit into a permanent brick 4 with the projecting part 10a of the end part at the iron shell 5 side, the float-up caused by shock at the time of punch-fitting the plug 6, is restrained and the free vibration is restrained too and the damage of the break-down, etc., can be prevented. Therefore, the changing work of the plug 6 in the hot-state is smoothly executed. Since the vibration of the tuyere brick 10 is restrained, the gap between the tuyere brick 10 and a work brick 3 and the permanent brick 4 contacting with the outer periphery of the tuyere brick, is difficult to develop and it can be prevented that the molten steel in a vessel reaches the iron shell 5.

3. 发明专利

JPH108126A VESSEL FOR LADLE REFINING 失效
公开(公告)号：JPH108126A
公开(公告)日：1998-01-13
申请号：JP15560196
申请日：1996-06-17
申请人： KAWASAKI STEEL CO
发明人： HASHIMOTO NAGAHITO , TERABATAKE TOMOMICHI , NAKAZAWA DAICHI , NABESHIMA YUKI , SUZUKI HAJIME
IPC分类号： B22D41/00 , C21C7/072
摘要： PROBLEM TO BE SOLVED: To restrain the erosion of a side wall refractory at the time of stir- refining molten metal by blowing inert gas and to prolong the service life of a vessel by arranging bottom-blown plugs at the center and at a specific distance from the center of bottom wall of the vessel for refining. SOLUTION: The molten metal incorporated in the vessel 1 for refining is stirringly refined by blowing the inert gas from a bottom-blown plug 2 arranged at the bottom wall center. Further, a second bottom plug 3 is arranged on the bottom wall to contrive the shortening of treating time. At this time, the interval distance 4 between the bottom-blown plugs 2, 3 is regulated to within a concentric circle range of 0.35 times of the bottom wall radius from the bottom wall center. By this constitution, treating time of the molten metal is not extended and the service life of the side wall refractory in the vessel can be improved by >= about 25%.

4. 发明专利

JPH0754031A LANCE FOR CHANGING RAW MATERIAL 失效
公开(公告)号：JPH0754031A
公开(公告)日：1995-02-28
申请号：JP19956093
申请日：1993-08-11
申请人： KAWASAKI STEEL CO , KAWASAKI HEAVY IND LTD
发明人： KUROKI TAKASHI , TAOKA KEIZO , HAMADA SHUNJI , HASHIMOTO NAGAHITO , NABESHIMA YUKI , INOUE EIJI , SAKAMOTO MANABU
IPC分类号： C21C5/46 , C21B11/00 , F27D3/18
摘要： PURPOSE:To obtain a lance for charging raw material further prolonging the service life by making the lance body a hollow annular body and providing a nozzle tip part constituted of an inner part water cooling steel-made member in this hollow annular body. CONSTITUTION:The lance body forming a supplying passage M for raw material is formed to the hollow annular body 1 and constituted of the nozzle tip 1a and a barrel part 1b. The nozzle tip 1a is constituted of the inner part water cooling copper-made member having >=15 deg. nozzle angle theta. Further, a ceramic linear 2 having excellent wear resistance is arranged in the inside of the hollow annular body 1. This liner 2 is arranged at the side wall of the supplying passage M except a zone (1) having the length of at least 0.8 times of the diameter D of the supplying passage M from the nozzle tip part. By this method, the wear at the nozzle tip can be reduced or prevented.

5. 发明专利

JP2002030327A METHOD FOR ASSEMBLING DIVIDED TYPE VACUUM VESSEL 失效
公开(公告)号：JP2002030327A
公开(公告)日：2002-01-31
申请号：JP2000212504
申请日：2000-07-13
申请人： KAWASAKI STEEL CO
发明人： HASHIMOTO NAGAHITO , ENDO MASATO , MISONOO TAKASHI , KUWAYAMA MICHIHIRO
IPC分类号： C21C7/10 , F27D1/00 , F27D1/16
摘要： PROBLEM TO BE SOLVED: To provide an assembling method with which when a divided type vacuum vessel is assembled, the working time is shortened and the safety is improved. SOLUTION: In the assembling of members vertically dividing the vacuum vessel, at the upper end surface of a lining refractory in the member positioned in the lower side, a weir is arranged and on the upper surface in the range from an iron shell to the weir, monolithic refractory is built up. Successively, the lower end surface of the lining refractory in the member positioned in the upper side is assembled so a to closely stick to the monolithic refractory.

6. 发明专利

JP2000017320A METHOD FOR PREVENTING EROSION OF LINING BRICK IN LADLE 失效
公开(公告)号：JP2000017320A
公开(公告)日：2000-01-18
申请号：JP20283098
申请日：1998-07-03
申请人： KAWASAKI STEEL CO
发明人： HASHIMOTO NAGAHITO , KUWAYAMA MICHIHIRO , UDAGAWA ETSURO
IPC分类号： C21C7/00
摘要： PROBLEM TO BE SOLVED: To provide a preventing method of the erosion of a lining brick in a ladle which can reduce the erosion of the lining brick at less than that of the conventional one, even in such refining that Al2O3 concn. in slag is not avoided from becoming high. SOLUTION: At the time of supplying molten steel tapped into the ladle from a steelmaking furnace, one or more kinds of materials selected from a material for MgO source, a material for CaO source, a material for Al2O3 source and a material for SiO2 source, are charged in the slag existing on the molten steel, and the composition of the slag is adjusted to the 10 wt.%

7. 发明专利

JPH07138630A DEVICE FOR CHARGING POWDERY AND GRANULAR MATERIAL IN METAL REFINING FURNACE AND CHARGING LANCE 失效
公开(公告)号：JPH07138630A
公开(公告)日：1995-05-30
申请号：JP28511593
申请日：1993-11-15
申请人： KAWASAKI STEEL CO , KAWASAKI HEAVY IND LTD
发明人： HAMADA SHUNJI , KUROKI TAKASHI , TAOKA KEIZO , NABESHIMA YUKI , SUZUKI TAKUYA , HASHIMOTO NAGAHITO , INOUE EIJI , SAKAMOTO MANABU , SATO SUMIO
IPC分类号： C21C5/46 , C21C7/072
摘要： PURPOSE:To blow powdery material in a good yield and to improve the operating rate of a refining furnace by constituting the lance for charging the powdery material to be freely attachable/detachable to/from this lifting device. CONSTITUTION:The charging lance 4 provided with a supplying hole for powdery and granular ore at the upper end part and a lifting device 5 for holding the lance 4 so as to be freely ascended/descended are provided and the lance 4 is freely attached/detached to this lifting device 5. A blowing hole 14 for purge gas for preventing the invasion of the furnace gas into lance 4 is arranged at the upper end part of this lance 4. It is more effective that the inner wall of the charging lance 4 is made of an inorganic material liner having divided structure. By this constitution, the powdery and granular material can effectively be charged and the operating ratio together with the yield are improved and the service life of the lance is extended, and also the operation is stabilized.

8. 发明专利

JP2000079455A METHOD FOR CONTINUOUSLY CASTING STAINLESS STEEL 失效
公开(公告)号：JP2000079455A
公开(公告)日：2000-03-21
申请号：JP25000498
申请日：1998-09-03
申请人： KAWASAKI STEEL CO
发明人： KUWAYAMA MICHIHIRO , HASHIMOTO NAGAHITO
IPC分类号： B22D11/00 , B22D11/10 , B22D11/108 , B22D41/32 , C21C7/06
摘要： PROBLEM TO BE SOLVED: To restrain the wear of a sliding plate and to improve an changing number of sequentially continuous casting by using an Mg-C quality refractory containing the metallic component in the plate refractory for a sliding nozzle arranged in a tundish. SOLUTION: An objective stainless steel is the stainless steel containing 9-30 wt.% Cr and deoxidized with Si. As a method for continuous casting, any method for using the sliding nozzle in the tundish can be applied. That is, this method can be applicable to a vertical type continuous caster, whole curving type continuous caster, vertical-bending type continuous caster, horizontal continuous caster, roll type or belt type thin slab continuous caster or strip continuous caster. The sliding plate is the one having MgO-C quality refractory as the base and containing the metallic component therein. As the metallic component, the component which is easily reacted with oxygen rather than C and restrainable to decarburization from the refractory with the oxygen in the molten steel, can be used.

9. 发明专利

JPH11172321A METHOD FOR DEOXIDIZING MOLTEN STEEL 失效
公开(公告)号：JPH11172321A
公开(公告)日：1999-06-29
申请号：JP33989197
申请日：1997-12-10
申请人： KAWASAKI STEEL CO
发明人： HASHIMOTO NAGAHITO , OGURA SHIGERU
IPC分类号： C21C7/04 , C21C7/06
摘要： PROBLEM TO BE SOLVED: To improve the yield of addition of an aluminum material used for deoxidation and to drastically reduce the production cost by adding the aluminum material to the tapped molten steel stream dropping position in a ladle after tapping a specific ratio of the undeoxidized molten steel refined in a steelmaking furnace into the ladle and deoxidizing. SOLUTION: The undeoxidized molten steel refined in the steel-making furnace is tapped into the ladle from the steelmaking furnace, and the aluminum or the aluminum alloy is added into the molten steel in the ladle to executed the deoxidization of the molten steel. At this time, when the tapping of molten steel into the ladle becomes >=1/2 of the whole tapping molten steel, the aluminum material is added to the tapped molten steel stream dropping position in the ladle. Then, as the aluminum material, a powdery, a bar-shaped or a block-shaped one is desirable. In this way, the molten steel and the added aluminum material can sufficiently be stirred and the deoxidation of the molten steel with the aluminum is sufficiently progressed. Further, the deoxidizer can be added without dipping a feeding tube into the molten steel and the eroded wearing of the feeding tube can be prevented.

10. 发明专利

JPH11131131A METHOD OF MANUFACTURING STEEL CONTAINING NITROGEN 失效
公开(公告)号：JPH11131131A
公开(公告)日：1999-05-18
申请号：JP29394997
申请日：1997-10-27
申请人： KAWASAKI STEEL CO
发明人： HASHIMOTO NAGAHITO , NISHIKAWA HIROSHI
IPC分类号： C21C7/00 , C21C7/072 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To stably manufacturing the nitrogen-containing steel in a short time when a simple equipment by blowing nitrogen or nitrogen-containing gas on the surface of the molten steel from a top-blow lance while the degree of vacuum in a vacuum degassing equipment after the degassing operation is kept so that nitrogen is not released outside. SOLUTION: The degree of vacuum of a RH degassing equipment 1 is kept at 1-200 Torr., and the tip of a top-blow lance 4 installed above the equipment is located within 1.5 m from the surface of the molten steel 6, and nitrogen or nitrogen-containing gas is blown thereon. The top-blow lance 4 to be used is preferably a lave-nozzle lance accompanied with the supersonic gas jet, and the nitrogen gas at a large flow rate can be blown, and the large nitrogen addition can be obtained, and the surface of the molten steel 6 is oscillated through generation of the ultrasonic wave to promote the nitrogen-adding speed. The degassing system is not limited to not only the RR system, but also DH system or VOD system.

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