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1. 发明专利

JP2000234119A METHOD FOR DESULFURIZING STEEL 失效
公开(公告)号：JP2000234119A
公开(公告)日：2000-08-29
申请号：JP3120799
申请日：1999-02-09
申请人： KAWASAKI STEEL CO
发明人： YAMASHITA KATSUTOSHI , OKUDA HARUYUKI
IPC分类号： C21C7/00 , C21C5/52 , C21C7/064
摘要： PROBLEM TO BE SOLVED: To provide a desulfurizing method of a steel, by which sulfur content can be reduced to extra-low range at more quick and stable method than the conventional method by using a ladle. SOLUTION: In the desulfurizing method of steel, by which the molten steel 5 and slag 6 are held in the ladle 8 and stirred by blowing inert gas 2 into the molten steel while suitably arc-heating the molten steel with plural electrodes 7 dipped into the slag, a refining agent is injected into the molten steel with the inert gas having such amount as not to disturb the generated arcs at the arc-heating time. The blowing of the inert gas is executed through a plurality of lances and it is desirable that the blowing position is each electrode position.

2. 发明专利

JPH1161221A METHOD FOR MELTING LOW MANGANESE STEEL 失效
公开(公告)号：JPH1161221A
公开(公告)日：1999-03-05
申请号：JP24187497
申请日：1997-08-22
申请人： KAWASAKI STEEL CO
发明人： OSHIMA KENJI , OKUDA HARUYUKI , EBARA TAKESHI
IPC分类号： C21C5/28 , C21C5/32 , C21C5/36 , C21C7/00
摘要： PROBLEM TO BE SOLVED: To efficiently lower Mn without accompanying extremely lowering Cf in a converter operational process and to secure the quality of an electric steel sheet, etc., without bringing about the rising of N in the steel by specifying the basicity and the total Fe content in converter slag. SOLUTION: The slag basicity (the ratio of SiO2 to the total CaO charged into the converter) is adjusted to 3.0-4.0 to achieve low Mn while restraining such FeO content in the slag as to keep the finish carbon Cf at the time of blowing off. Further, the total Fe content in the converter slag is restrained to in the range of 15-25%. At the time of executing the converter operation so as to satisfy the above condition, the low Mn steel can be produced while keeping the Cf to almost 0.035%, but MgO content in the slag may be adjusted to 8-11% in order to further rise the Mn partition ratio. After completing the check of the steel components and the measurement of the temp. etc., wish a sub-lance at the end stage of the converter operation, the suitable quantity of slag-making material of iron ore, SiO2 , Cab, etc., is added to adjust the slag composition.

3. 发明专利

JPH08325623A STEELMAKING REFINING METHOD 失效
公开(公告)号：JPH08325623A
公开(公告)日：1996-12-10
申请号：JP13389595
申请日：1995-05-31
申请人： KAWASAKI STEEL CO
发明人： OSHIMA KENJI , OKUDA HARUYUKI , TAKE HIDEO
IPC分类号： C21C5/36 , C21C5/52 , C21C7/04 , C21C7/064
摘要： PURPOSE: To obtain a good slag condition since the initial stage of blowing and to prevent the defective dephosphorization by charging a material consisting essentially of specific quantities of MgO and SiO2 and the balance inevitable impurities into a refining vessel and executing steelmaking refining. CONSTITUTION: The material composed of a compound containing each >=30wt.% MgO and SiO2 as the main components and being in the range of 0.7-1.5wt. ratio of MgO/SiO2 and the balance inevitable impurities, is charged into the refining vessel to execute the steelmaking refining. Further, as the compound, a natural serpentine or an artificial fused synthetic material is utilized and this grain size is made to be in the range of 2-50mm and the charge thereof is executed before oxygen-blowing and/or during blowing or executed by blowing gas. By this method, fluorspar, alumina, etc., is not added and the consumption of dolomite is little for executing the steelmaking refining.

4. 发明专利

JPH0688116A METHOD FOR PRE-TREATING MOLTEN IRON 失效
公开(公告)号：JPH0688116A
公开(公告)日：1994-03-29
申请号：JP35088791
申请日：1991-12-11
申请人： KAWASAKI STEEL CO
发明人： MAKINO MITSUNORI , KUROSE YOSHIKAZU , OKUDA HARUYUKI
IPC分类号： C21C1/02
摘要： PURPOSE:To provide a pre-treating method having the desulfurizing efficiency and rephosphorizing prevention effect equivalent to the time using soda ash without using the soda ash having various kinds of troubles as flux, in the pre-treatment of a molten iron. CONSTITUTION:After executing desiliconization and dephosphorization by adding the flux, slag is removed, and by adding CaO-base flux, the basicity of the slag is held to >=3.5 and the desulfurization is executed. After removing the slag, the CaO-base flux is added to hold the basicity of the slag to >=3.5, and by executing the desulfurization, the high desulfurizing reaction efficiency is obtd. without using the soda ash and also, the rephosphorization can be prevented.

5. 发明专利

JPH0617113A VACUUM DEGRASSING TREATING METHOD OF MOLTEN STEEL 失效
公开(公告)号：JPH0617113A
公开(公告)日：1994-01-25
申请号：JP17351992
申请日：1992-06-30
申请人： KAWASAKI STEEL CO
发明人： OSHIMA KENJI , OKUDA HARUYUKI
IPC分类号： C21C7/10
摘要： PURPOSE:To adjust nitrogen content dissolved into a molten steel in good hitting ratio by a circulating type degassing treatment. CONSTITUTION:By using the gaseous mixture of Ar and N2 as circulating gas for blowing gas from a circulating gas blowing pipe 8 to an uptake immersion tube 6, the mixing ratio of the gaseous N2 in the gaseous mixture is decided based on the difference between the measured [N] content before the degassing treatment in the molten steel 4 in a ladle 3 and the aimed [N] content after the degassing treatment. By blowing the gaseous mixture of Ar having the decided gaseous N2 mixing ratio into the uptake immersion tube 6, [N] in the molten steel at the time of completing the degassing treatment is nitrified in the good hitting ratio.

6. 发明专利

JPH0421728B2 失效
公开(公告)号：JPH0421728B2
公开(公告)日：1992-04-13
申请号：JP21304085
申请日：1985-09-26
申请人： KAWASAKI STEEL CO
发明人： OKUDA HARUYUKI , TAKE HIDEO
IPC分类号： C21C5/34 , C21C5/48

7. 发明专利

JPS6274017A PROTECTING METHOD FOR DOUBLE PIPE TUYERE 失效
公开(公告)号：JPS6274017A
公开(公告)日：1987-04-04
申请号：JP21304085
申请日：1985-09-26
申请人： KAWASAKI STEEL CO
发明人： OKUDA HARUYUKI , TAKE HIDEO
IPC分类号： C21C5/34 , C21C5/48
摘要： PURPOSE:To prevent the wear of the double-pipe tuyere provided to the side part or bottom part of a refining furnace such as converter by specifying the timings for opening and closing selector valves for a refining gas, cooling gas and inert gas to the inside and outside pipes of the tuyere. CONSTITUTION:The double-pipe tuyere is constituted of the outside pipe 1 and the inside pipe 2. The refining gas is blown into the converter from the pipe 2 and the cooling gas from the pipe 1 (state A). The inert gas is blown from the pipes 2, 1 when the converter 7 tilts and while the tuyere 8 is not is contact with a molten metal (state B). The state B is the state in which valves 12, 14 are open. The timings for opening and closing the selector valves are controlled in accordance with the volume and flow rate of the gas in the piping from the selector valves of the inside and outside pipe lines 10, 9 up to the tuyere 8 in the stage of changing the state B to the state A. The blowing of the cooling gas is started at >=1sec before start of blowing in the state of starting the blowing of the refining gas. The blowing of the cooling gas is stopped with >=1sec delay than at the end of blowing in the stage of ending the blowing of the refining gas.

8. 发明专利

JP2001040411A LADLE FOR REFINING MOLTEN STEEL 失效
公开(公告)号：JP2001040411A
公开(公告)日：2001-02-13
申请号：JP21808899
申请日：1999-07-30
申请人： KAWASAKI STEEL CO
发明人： TAKAHASHI DAISUKE , OKUDA HARUYUKI , YAMAGUCHI KIMIHARU
IPC分类号： B22D1/00 , C21C7/00 , C21C7/072
摘要： PROBLEM TO BE SOLVED: To provide an electrically heating type refining ladle, in which mix- stirring force for molten steel can remarkably be strengthed in comparison with the conventional ladle while restraining the disturbance of molten steel surface layer to the minimum, and therefore, the ladle refining time needed for desulfurization, etc., can drastically be shortened or the refining reaching limit, such as the desulfurizing limit, etc., can remarkably be improved. SOLUTION: Plural plugs 3A, 3B are fitted to the ladle for refining and these fitting positions are unevenly positioned to the one side between two parts formed by dividing the bottom part 1B of the ladle 1 for refining into two and also, the relation between the inner diameter (D) of the ladle side wall 1A and the diameter (d) for disposing the plug concentric with the ladle side wall, satisfies d/D=0.50-0.80. Further, the relation between the diameter (d) for disposing the plug and the diameter (A) of the circle passing the center of the electrodes, satisfies d>1.5A.

9. 发明专利

JP2000104111A METHOD FOR ADJUSTING NITROGEN CONCENTRATION IN MOLTEN STEEL 失效
公开(公告)号：JP2000104111A
公开(公告)日：2000-04-11
申请号：JP27716398
申请日：1998-09-30
申请人： KAWASAKI STEEL CO
发明人： YAMASHITA KATSUTOSHI , OKUDA HARUYUKI
IPC分类号： C21C7/00 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide an adjusting method of nitrogen concn. in molten steel having lower cost than the conventional method and high hitting precision to the target value. SOLUTION: At the time of producing a cast slab of the nitrogen-containing steel by pouring the molten steel which already executes the vacuum degassing treatment, into a mold through a tundish for continuous caster, the blowing flow rate of the gaseous nitrogen is decided by blowing the gaseous nitrogen for preventing a nozzle clogging, into the nozzle in the tundish and using the nitrogen balance between the molten steel and the gaseous nitrogen under consideration of the absorbing ratio of the nitrogen into the molten steel from the gas so as to eliminate the difference between the target nitrogen concn. in the cast slab during pouring the molten steel and the nitrogen concn. in the molten steel when the vacuum degassing treatment completes.

10. 发明专利

JP2000102849A ROTATION FAILURE DETECTING METHOD FOR CONTINUOUS CASTING ROLL 失效
公开(公告)号：JP2000102849A
公开(公告)日：2000-04-11
申请号：JP27728198
申请日：1998-09-30
申请人： KAWASAKI STEEL CO
发明人： YAMAZAKI HISAO , MISAKI NORIO , OSANAI HISASHI , OKUDA HARUYUKI , NAKAMURA TAKASHI
IPC分类号： B22D11/128 , B22D11/16
摘要： PROBLEM TO BE SOLVED: To securely detect rotation failure of a roll under bad conditions around a continuous casting machine which generates steam and scale, by providing protrusions along the circumference near the end portion of the roll and installing a detector to detect the rotation of the roll by colliding with the protrusions when the roll rotates. SOLUTION: At multiple places on the circumference of the end portion of continuous casting roll 1 which carries a continuous casting cast metal 2, iron protrusions 4, of for example, 3 mm diameter × 50 mm length are installed. On the outer surface of roll bearing 3, a waterproof detector 12 incorporating a limit switch is installed, and every time when the continuous casting roll 1 rotates, the arm 14 of the limit switch hits the protrusions 4 so as to transmit electric output signals through a signal conductor 13. Since the diameter of the continuous casting roll 1 is known in advance, the time converted from the pouring rate of the continuous casting cast metal 2 and the time sent from the limit switch are compared to detects the difference, thus confirming the rotation failure of the roll.

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