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1. 发明专利

JPH0539522A LANCE PIPE FOR INJECTING GAS 失效
公开(公告)号：JPH0539522A
公开(公告)日：1993-02-19
申请号：JP21629891
申请日：1991-08-02
申请人： TOSHIBA CERAMICS CO , SUMITOMO METAL IND
发明人： HIGASHIYAMA KOJI , KIJIMA MASAHIKO , KUBO YOSHIKAZU , NAKAGAWA KEITA
IPC分类号： C21C7/072
摘要： PURPOSE:To prevent damage at a position near a gas discharging hole and to drastically improve the service life. CONSTITUTION:A cylindrical refractory brick 10 having erosion resistance is fitted as insertiable into/separable from outer periphery of the gas discharging holes 8, 9 in a core pipe 1, and by covering a part of the refractory brick 10 and large part of the core pipe 1 with monolithic refractory 14, the refractory brick covering outer periphery of the core pipe near the gas discharging hole can be changed.

2. 发明专利

JPH08283822A METHOD FOR PROTECTING BOTTOM-BLOWING TUYERE FOR REFINING 失效
公开(公告)号：JPH08283822A
公开(公告)日：1996-10-29
申请号：JP10800195
申请日：1995-04-07
申请人： SUMITOMO METAL IND
发明人： NAKAGAWA KEITA
IPC分类号： F27B1/16 , C21C5/34 , C21C5/48 , C21C7/072 , F27D3/16
摘要： PURPOSE: To restrain the erosion of a tuyere and to extend the service life by selecting the inner and the outer diameters of an inner and an outer tubers, where the diameters have the specific relations to a heat receiving index, heat receiving velocity and heat conducting velocity based on a bottom-blowing gas flow rate. CONSTITUTION: In the inner tube at the outside of a core body in the center part, the inner tube is inserted into and fixed to the outer tube with a suitable gap therebetween. Thus, an annular gas blowing flow path is formed to constitute the bottom-blowing tuyere for refining having a has blowing nozzle. In order to protect this tuyere, based on the bottom- blowing gas flow rate, the inner and the outer diameters of the inner tube and the outer tube are selected so that the heat receiving index represented by the equation I, i.e., the value obtained by dividing the heat receiving velocity in the equation II with the heat conducting velocity in the equation III becomes 20-40. Heat receiving index = heat receiving velocity/heat conducting velocity. ...(I) Heat receiving velocity = D0 -(D1 -d0 )...(II) Heat conducting velocity=(0.13×D1 ×V )/(D1 -d0 ) ...(III) In the equations, D0 is the outer diameter of the outer tube (mm), D1 is the inner diameter of the outer tube (mm), d0 is the outer diameter of the inner tube (mm), d1 is the inner diameter of the inner tube (mm) and V is gas flow rate (Nm /hr). By this constitution, a suitable mushroom shape can be formed.

3. 发明专利

JPH08127812A METHOD FOR REMOVING STUCK METAL ON CONVERTER 失效
公开(公告)号：JPH08127812A
公开(公告)日：1996-05-21
申请号：JP26540094
申请日：1994-10-28
申请人： SUMITOMO METAL IND
发明人： NAKAGAWA KEITA , YAMAMOTO SHINYA
IPC分类号： C21C1/00 , C21C5/46
摘要： PURPOSE: To prolong the service life of a converter by injecting oxygen toward the inner wall surface of the converter from injecting holes opened at the upper side surface of an tip injecting hole. CONSTITUTION: After inserting a lance 1 into the converter 2, the oxygen is injected to molten iron 3 from the tip injecting hole. At the same time, the oxygen is injected to the wall surface 2a in the converter from the injecting holes opened at the upper position of the side surface of the lance 1 having a prescribed interval from the tip injecting hole. At this time, since the surface temp. of metal 9 deposited onto the wall surface 2a in the converter is at the high temp. condition, the metal 9 is reacted with the oxygen and melted down. By this method, the molten iron is easily tapped and the yield can be improved.

4. 发明专利

JPH0820810A METHOD FOR PRETREATING MOLTEN IRON BY BOTTOM-BLOWING GAS STIRRING 失效
公开(公告)号：JPH0820810A
公开(公告)日：1996-01-23
申请号：JP17751194
申请日：1994-07-05
申请人： SUMITOMO METAL IND
发明人： NAKAGAWA KEITA , YOSHIHARA HIDEO
IPC分类号： C21C1/02 , C21C1/04 , C21C5/34
摘要： PURPOSE:To obtain sufficient gas stirring force without rising the stirring gas cost in a pretreatment of molten iron. CONSTITUTION:In the pretreating method of the molten iron, in which desiliconizing and dephophorizing treatments of the molten iron in a blast furnace are executed by using a refining vessel having a bottom-blowing stirring mechanism, nitrogen gas is used as the stirring gas in a desiliconizing period and carbon dioxide gas is used as the stirring gas in a dephosphorizing period. By this method, the cost of the desiliconizing and the dephosphorizing pretreatments can be reduced.

5. 发明专利

JPH0632651A REFRACTORY FOR REFINING IN-LADLE MOLTEN STEEL THROUGH RAISING TEMPERATURE 失效
公开(公告)号：JPH0632651A
公开(公告)日：1994-02-08
申请号：JP19179992
申请日：1992-07-20
申请人： SUMITOMO METAL IND
发明人： NAKAGAWA KEITA , OTSUKA MASATOSHI , SAKAI KAZUO
IPC分类号： B22D1/00 , C04B35/10 , C04B35/101
摘要： PURPOSE:To provide a refractory for snorkels excellent in resistance to erosion and infiltration of SiO2 slag. CONSTITUTION:The surface of molten steel is sprayed with oxygen gas via an oxygen lance to raise molten steel temperature while adding a temperature raising agent to the molten steel in a ladle along with agitating the molten steel by blowing an inert gas through a bubbling lance; in this case, a snorkel is immersed in the surface portion of the molten steel and a gas in the space enclosed by the snorkel and molten steel surface is exhausted. At this time, the snorkel is composed mainly of (A) 90-97wt.% of Al2O3 and (B) 10-3wt.% of MgO.

6. 发明专利

JPH05156338A METHOD FOR REUSING LOW PHOSPHORUS CONVERTER SLAG 失效
公开(公告)号：JPH05156338A
公开(公告)日：1993-06-22
申请号：JP32189191
申请日：1991-12-05
申请人： SUMITOMO METAL IND
发明人： NAKAGAWA KEITA , FUJIWARA KIYOTO
IPC分类号： C21C5/28 , C21C7/00 , C21C7/064 , C21C7/076
摘要： PURPOSE:To reduce consumption and loss quantity of fluorite at the time of using low P converter slag as slag-making agent in a dephosphorizing furnace. CONSTITUTION:At the time of reusing the low P converter slag 5 obtd. at the time of decarbonize-refining molten iron already executing the dephosphorized treatment in the converter 2 and receiving the converter slag 5 removed from the converter 2 into a slag pan 3, in the condition of pre-charging auxiliary material of at least the fluorite 4, etc., in the slag pan 3, the above converter slag 5 is received, and after the above auxiliary material 4 is melted and mixed in the converter slag 5, this auxiliary material is used to the dephosphorizing treatment in the dephosphorizing furnace 1 or a ladle 6.

7. 发明专利

JPH04354818A METHOD FOR PREVENTING STICKING OF METAL TO OPENING PART IN VACUUM REFINING FURNACE 失效
公开(公告)号：JPH04354818A
公开(公告)日：1992-12-09
申请号：JP12978691
申请日：1991-05-31
申请人： SUMITOMO METAL IND
发明人： NAKAGAWA KEITA , FUJIWARA KIYOTO , KUBO YOSHIKAZU
IPC分类号： C21C7/10
摘要： PURPOSE:To secure an opening part causing no reduction in the opening area after operation by preventing sticking of metals to the opening part in a vacuum refining furnace with simple method. CONSTITUTION:Before the operation, a protecting plate 7 spread so as to practically cover the opening part 4 is arranged at inside of the furnace of the opening part 4 in the vacuum refining furnace 1, and after the operation, the protecting plate 7 is dropped and wasted into the furnace together with the metals stuck to the protecting plate 7. The protecting plate 7 is composed of plural blade-like parts 10 and passed through the opening part 4 under the condition of folding up the plural blade-like parts 10, and after passing through, by spreading the blade-like parts 10, the protecting plate 7 practically covering the opening part 4 is formed.

8. 发明专利

JPH03107411A METHOD FOR REFINING DUPLEX STAINLESS STEEL 失效
公开(公告)号：JPH03107411A
公开(公告)日：1991-05-07
申请号：JP24748589
申请日：1989-09-22
申请人： SUMITOMO METAL IND
发明人： YAMADA TOSHIAKI , AKEMIYA TOORU , NAKAGAWA KEITA , SHIODE SUMITAKA
IPC分类号： C21C7/00 , C21C7/076 , C21C7/10
摘要： PURPOSE:To refine a duplex stainless steel having superior corrosion resistance and hot workability by throwing a flux in which specific amounts of Al are mixed into a molten steel flow to carry out desulfurization treatment, adding specific amounts of Al to the molten steel, and carrying out deoxidation treatment by means of vacuum refining. CONSTITUTION:A flux in which Al ls mixed by >=5% is thrown into a molten steel flow to carry out desulfurization treatment, by which stable desulfurization is performed outside the furnace without causing erosion to the refractory inside the furnace. Subsequently, Al is added to the molten steel after desulfurization so that Al content reaches >=0.020%. Then, deoxidation treatment is carried out by circulating the above molten steel through RH vacuum refining equipment, by which deaeration is exerted and oxidized inclusions are allowed to rise to the surface to reduce the amount of dissolved oxygen in the molten steel. By this method, refining can be performed at high deoxidation rate and high desulfurization rate, and the duplex stainless steel having superior corrosion resistance and hot workability (drawing rate) can be obtained.

9. 发明专利

JP2000144342A FERRITIC STAINLESS STEEL AND FERRITIC STAINLESS STEEL SLAB EXCELLENT IN FORMABILITY 失效
公开(公告)号：JP2000144342A
公开(公告)日：2000-05-26
申请号：JP757299
申请日：1999-01-14
申请人： SUMITOMO METAL IND
发明人： FUJIMURA HIROSHI , TSUGE SHINJI , NISHI TAKAYUKI , ARAI MASAHIRO , NAKAGAWA KEITA , KONDO TSUNEO
IPC分类号： B22D11/00 , C22C38/00 , C22C38/28
摘要： PROBLEM TO BE SOLVED: To produce ferritic stainless steel excellent in formability so as to be capable of working a continuously cast slab into a prescribed shape by working such as hot working, bulging working, drawing working, bending working without causing surface defect, cracking or fracture, and to provide the slab. SOLUTION: This ferritic stainless steel excellent in formability has a chemical compsn. composed of =0.001% Al, 70 vol.% equiaxed crystal ratio.

10. 发明专利

JPH08325625A SLEEVE FOR STEEL TAPPING HOLE IN REFINING FURNACE 失效
公开(公告)号：JPH08325625A
公开(公告)日：1996-12-10
申请号：JP12809395
申请日：1995-05-26
申请人： SUMITOMO METAL IND
发明人： NAKAGAWA KEITA
IPC分类号： C21C5/46
摘要： PURPOSE: To effectively restrain the flow-out of slag by making the length at the inner peripheral side of a sleeve fitted to a steel tapping hole for flowing out molten steel in a refining furnace larger than the length of the outer periphery of a complete round to reduce the flowing speed of the slag. CONSTITUTION: The molten steel 2 stored in the refining furnace 1 is flowed out through the steel tapping hole 1c fitting the sleeve 3. In this time, the sleeve has the inner peripheral surface shape (crossing type, star type, etc.) so that the length at the inner peripheral side in the cross sectional surface in the axial direction of the sleeve 3 is longer than the outer peripheral length of the complete round making the distance from the axial center of the sleeve 3 to the average thickness part in the cross sectional surface as a radius. By this constitution, the contacting area with the inner peripheral surface of the sleeve 3 at the time of passing the molten steel 2 and the slag 4 through this sleeve 3 becomes large and the flowing speed of the slag 4 having high viscosity is reduced by this contacting resistance and the flow-out of the slag 4 is effectively restrained.

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