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1. 发明专利

JPH09217109A SIMULTANEOUS DEOXIDIZING AND DESULFURIZING AGENT FOR MOLTEN STEEL AND SIMULTANEOUSLY DEOXIDIZING AND DESULFURIZING METHOD 失效
公开(公告)号：JPH09217109A
公开(公告)日：1997-08-19
申请号：JP4846996
申请日：1996-02-13
申请人： NISSHIN STEEL CO LTD
发明人： TATEYAMA MASAYUKI , GENNAI KIYOTAKA , HIRAGA YUTAKA , NAKAJIMA YOSHIO
IPC分类号： C21C7/04 , C21C7/06 , C21C7/064
摘要： PROBLEM TO BE SOLVED: To provide a simple Mg additional technique in a low cost by utilizing single metallic Mg as a blending component without using Mg executing alloy treatment. SOLUTION: A simultaneous deoxidizing and desulfurizing agent for molten steel satisfying the following relations in the composition of blending 5-25wt.% metallic Mg and the balance CaO and the other component, is provided. Metallic Mg (%)+CaO (%)+CaF2 (%)+MgO (%) >=90. 0

2. 发明专利

JPH03122217A PRODUCTION OF EXTRA THIN COLD ROLLED STEEL SHEET FROM THIN CAST SLAB 失效
公开(公告)号：JPH03122217A
公开(公告)日：1991-05-24
申请号：JP26022889
申请日：1989-10-06
申请人： NISSHIN STEEL CO LTD
发明人： OKIMURA TOSHIAKI , IKEDA KAMEO , GENNAI KIYOTAKA , FUKUI KATSUNORI
IPC分类号： C21D8/04 , C21D9/46 , C22C38/00 , C22C38/04
摘要： PURPOSE:To produce an extra thin cold rolled steel sheet energy savingly without causing seizure at the time of annealing by subjecting a thin case slab of low carbon steel to hot rolling in an alpha-region, applying cold rolling to the resulting plate at specific rolling reduction, and further applying final annealing to be resulting extra thin sheet at low temp. CONSTITUTION:A sheet-like cast slab of dead-soft carbon steel having a composition containing, by weight,

3. 发明专利

JPH0382735A STEEL FOR EXTRUDING AND EXTRUDING METHOD 失效
公开(公告)号：JPH0382735A
公开(公告)日：1991-04-08
申请号：JP21797689
申请日：1989-08-24
申请人： NISSHIN STEEL CO LTD
发明人： OKIMURA TOSHIAKI , IKEDA KAMEO , GENNAI KIYOTAKA , FUKUI KATSUNORI
IPC分类号： B21C23/00 , C21D8/00 , C22C38/00 , C22C38/04
摘要： PURPOSE:To reduce the working temp. in the steel, to suppress the formation of oxidized scales thereon and to make better its surface skin by extruding a steel contg. specified C, Si, Mn, N and Fe at a prescribed temp. CONSTITUTION:A steel constituted of, by weight,

4. 发明专利

JPH09209026A SIMULTANEOUS DEOXIDIZING AND DESULFURIZING AGENT FOR MOLTEN STEEL AND METHOD FOR SIMULTANEOUSLY DEOXIDIZING AND DESULFURIZING MOLTEN STEEL USING IT 失效
公开(公告)号：JPH09209026A
公开(公告)日：1997-08-12
申请号：JP4219696
申请日：1996-02-06
申请人： NISSHIN STEEL CO LTD
发明人： TATEYAMA MASAYUKI , GENNAI KIYOTAKA , HIRAGA YUTAKA , NAKAJIMA YOSHIO
IPC分类号： C21C7/04 , C21C7/06 , C21C7/064
摘要： PROBLEM TO BE SOLVED: To provide a simple Mg addition technique at a low cost by utilizing the single metallic Mg as a blending component without using an alloying- treated Mg. SOLUTION: A simultaneously deoxidizing and desulfurizing agent for molten steel satisfies the formulas I, II, III for the composition of the blending components of the agent which has compn. consisting of 5-25wt.% metallic Mg and the balance MgO and CaF2 and further, containing CaO at need. The formula I (by wt.%): metallic Mg(%)+MgO(%)+CaO(%)+CaF2 (%)>=90. The formula II (by wt.%): 1 =1.5 × metallic Mg(%). Further, this simultaneously deoxidizing and desulfurizing agent is coated with an iron to be formed in a wire shape and added into molten steel at supplying velocity of 0.2-0.8kg/t-molten steel/min expressed in terms of the pure Mg supplying velocity.

5. 发明专利

JPH07207320A METHOD FOR DESULFURIZING MOLTEN IRON IMPROVING DESULFURIZING EFFICIENCY 失效
公开(公告)号：JPH07207320A
公开(公告)日：1995-08-08
申请号：JP463994
申请日：1994-01-20
申请人： NISSHIN STEEL CO LTD
发明人： OKIMURA TOSHIAKI , GENNAI KIYOTAKA , NAKAJIMA YOSHIO
IPC分类号： C21C1/02
摘要： PURPOSE:To desulfurize molten iron with high desulfurizing efficiency by bringing Mg or Mg allay into contact with the molten iron having low oxygen potential. CONSTITUTION:A wire 8 including a metal or alloy 6 having high desulfurizing performance and low b.p. metal and a metal or alloy 7 having high deoxidation performance is continuously supplied into the molten iron 2. As the low b.p. metal or alloy, powdery, granular, wire-cut state or wire rod state Mg or Mg alloy is used, and as the metal or alloy having high deoxidation performance, Al or Al alloy, etc., is used. These can be fed into the molten iron 2 as the separated wires, respectively. As the oxygen potential in the molten metal is lowered by the metal or alloy having high deoxidation performance, reaction of Mg+[O] MgO is restrained and Mg or Mg alloy is efficiently consumed in the desulfurizing reaction of Mg+[S] MgS.

6. 发明专利

JPH06240378A PRODUCTION OF LOW-SI, LOW-P, HIGH-MN MOLTEN IRON ACCOMPANYING SMELTING REDUCTION OF MN ORE 失效
公开(公告)号：JPH06240378A
公开(公告)日：1994-08-30
申请号：JP5005093
申请日：1993-02-16
申请人： NISSHIN STEEL CO LTD
发明人： HIRAGA YUTAKA , YAMAMOTO ATSUO , GENNAI KIYOTAKA , NAKAJIMA YOSHIO
IPC分类号： C22B5/02 , C21C1/02 , C21C1/04 , C22B47/00
摘要： PURPOSE:To provide the low-Si, low-P, high-Mn molten iron by increasing the Mn concn. in the molten iron by smelting reduction of Mn ore and subjecting the molten iron to desiliconization and clephosphorization. CONSTITUTION:A mixture composed of quicklime and the powdery Mn ore is added to the molten iron tapped from a blast furnace in such a manner that the basicity attains 1.5 to 4.0 to desiliconize the molten iron. In succession, a carbonaceous material and a flux compounded with one or >=2 kinds of CaF2, Al2O3, and CaCl2 are added together with the mixture composed of the quicklime and the powdery Mn ore to the molten iron after the desiliconization, by which the dephosphorization and the reduction of the Mn ore are simultaneously progressed. As a result, the Mn concn. of the molten iron is increased by using the Si in the molten iron for reduction of the Mn ore without using costly ferromanganese.

7. 发明专利

JPH10152713A METHOD FOR DEPHOSPHORIZING AND DESULFURIZING MOLTEN IRON 失效
公开(公告)号：JPH10152713A
公开(公告)日：1998-06-09
申请号：JP32485596
申请日：1996-11-21
申请人： NISSHIN STEEL CO LTD
发明人： TATEYAMA MASAYUKI , GENNAI KIYOTAKA , HIRAGA YUTAKA , OKIMURA TOSHIAKI
IPC分类号： C21C1/02
摘要： PROBLEM TO BE SOLVED: To efficiently realize the desulfurization of molten iron to low concn. range without needing long time to the dephosphori-zation by continuously feeding a linear solid desulfurizing agent containing metallic Mg in its axial direction from the bath surface into the bath at a prescribed speed while injecting dephos-phorizing agent into the molten iron. SOLUTION: The desulfurization and the dephosphorization are simultaneously treated to the molten iron 2 in a vessel 1. While injecting the dephosphorizing agent into the molten iron 2 by using an immersion lance 3, simultaneously, the linear solid de-sulfurizing wire agent 4 containing the metallic Mg is continuously fed from the bath surface into the bath at the prescribed speed. The immersion lance 3 is provided with a blowing hole 5 at the top part of a tubular body protected with a refractory. The injection of the dephosphorizing agent is executed by carrying the powdery dephosphorizing agent 6 with carrier gas 7. By this method, the desulfurization and the dephosphorization can efficiently and simultaneously be executed in good operatability.

8. 发明专利

JPH09157721A PRODUCTION OF EXTREMELY LOW SULFUR MOLTEN IRON 失效
公开(公告)号：JPH09157721A
公开(公告)日：1997-06-17
申请号：JP34497095
申请日：1995-12-06
申请人： NISSHIN STEEL CO LTD
发明人： HIRAGA YUTAKA , GENNAI KIYOTAKA , NAKAJIMA YOSHIO , HIRAMA JUN
IPC分类号： C21C1/02
摘要： PROBLEM TO BE SOLVED: To efficiently progress desulfurizing reaction and to produce an extremely low sulfur molten iron in a short time by supplying a desulfurizing agent fill-up wire into the molten iron in a vessel and further, increasing the supplying lines of the wires in desulfurizing to a specific sulfur concn. SOLUTION: The desulfurizing agents 141 , 142 ... are charged into the molten iron 21 of a blast furnace incorporated in a treating vessel 20 to execute the desulfurization. This desulfurizing agent 141 , 142 are supplied by feeding plural lines of the desulfurizing agent fill-up wires 111 , 112 ... rewound from pay-off reels 121 , 122 ... of plural sets of wire feeders 101 , 102 ... into the molten iron 21 through guides 131 , 132 .... At this time, when the sulfur estimated concn. in the molten iron reaches ) for the surface area of the molten iron 21 in the vessel, the total supplying lines (n) are desired to satisfy n>=A/1.5. By this method, desulfurizing reaction site in the inner part of the molten iron is widely dispersed in the horizontal direction, and the extremely low sulfur molten iron having

9. 发明专利

JPH07207319A METHOD FOR DESULFURIZING MOLTEN IRON WITH MG IMPROVING DESULFURIZATING 失效
公开(公告)号：JPH07207319A
公开(公告)日：1995-08-08
申请号：JP463694
申请日：1994-01-20
申请人： NISSHIN STEEL CO LTD
发明人： OKIMURA TOSHIAKI , NAKAJIMA YOSHIO , GENNAI KIYOTAKA
IPC分类号： C21C1/02
摘要： PURPOSE:To improve the ratio of Mg effectively consumed to desulfurizing by feeding an Mg base wire into molten iron kept in an inert gas atmosphere. CONSTITUTION:An upper cover 3 inserting a supplying tube 9 is fitted to a ladle 2 incorporating the molten iron 1 and an upper space 6 above the molten iron 1 is kept in the inert gas atmosphere, and the Mg base wire 8 is fed into the inner part of the molten iron 1 as desulfurizing agent. Infiltration of the outer air into the upper space 6 is prevented by applying the air-tight seal 10 and/or keeping the atmospheric pressure in the upper space 6 in higher than the atmospheric pressure at the outside of the ladle 2. The upper space 6 is desirable to keep in the inert gas atmosphere having

10. 发明专利

JPH0463221A METHOD FOR REDUCING NITROGEN IN VACUUM REFINING OF MOLTEN STEEL 失效
公开(公告)号：JPH0463221A
公开(公告)日：1992-02-28
申请号：JP17238890
申请日：1990-06-29
申请人： NISSHIN STEEL CO LTD
发明人： OKIMURA TOSHIAKI , GENNAI KIYOTAKA , NAKAJIMA YOSHIO
IPC分类号： C21C7/10
摘要： PURPOSE:To efficiently and economically apply denitriding treatment to a molten steel by spraying an Ar gas of specific flow rate on the surface of the molten steel in a vacuum tank in the course from the stage just before the final deoxidation by means of Al, etc., to the completion of degassing treatment. CONSTITUTION:A molten steel 2 in a ladle 1 is sucked into a vacuum tank 3 simultaneously with the initiation of degassing treatment. Subsequently, the molten steel 2 is circulated by blowing an Ar gas 4 through a nozzle 6 provided to one immersion tube 5. After decarburizing reaction is performed until the desired [C] level is reached in the above state, the Ar gas is sprayed on the surface of the molten steel by 5-15Nl/ton.min through gas spray nozzles 7 provided to the barrel of the vacuum tank in the course from the stage just before the final deoxidation by means of Al to the completion of degassing treatment. By this method, a low nitrogen steel of

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