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1. 发明专利

JPS6313650A CONTINUOUS CASTING FOR MOLTEN STEEL 失效
公开(公告)号：JPS6313650A
公开(公告)日：1988-01-20
申请号：JP15510986
申请日：1986-07-03
申请人： NIPPON STEEL CORP
发明人： KUDO KOICHI , UEZAKI HIROKUNI , KIMURA KATSUICHI
IPC分类号： B22D11/10 , B22D11/00 , B22D11/108 , B22D11/11 , B22D11/112 , B22D11/115 , B22D11/116 , B22D11/117
摘要： PURPOSE:To obtain high carbon steel wire rod having good internal quality by holding the specific molten steel temp. and next adding electromagnetic stirring in a mold and at a secondary cooling zone. CONSTITUTION:By executing stirring and melting as charging coolant into a tundish of continuous casting as an adjusting material for the molten steel temp., its temp. is held at the solidus + >10 deg.C - the liquidus + 20 deg.C. Next, the molten steel in the tundish is poured into the mold through a submerged nozzle and the electromagnetic stirring is executed to the molten steel in the mold and further the electromagnetic stirring is executed to the non-solidified molten steel at the secondary cooling zone, to cast. In this way, the high carbon steel wire rod having excellent quality is stably is stably produced.

2. 发明专利

JPS626744A CONTINUOUS CASTING METHOD FOR HIGH-CARBON STEEL 失效
公开(公告)号：JPS626744A
公开(公告)日：1987-01-13
申请号：JP14403585
申请日：1985-07-02
申请人： NIPPON STEEL CORP
发明人： KIMURA KATSUICHI , UEJIMA YOSHIYUKI
IPC分类号： B22D11/124
摘要： PURPOSE:To prevent the defect of an ingot and product by slowly cooling a high-carbon steel of a specific range at a specific cooling rate from the solidification initiation temp. in the central part of the ingot up to a prescribed temp. in the solidification process in the continuous casting of said high-carbon steel. CONSTITUTION:The high-carbon steel having 0.54-1.50% carbon concn. is slowly cooled at

3. 发明专利

JPS60234912A TOP AND BOTTOM-BLOWN OXYGEN STEEL MAKING PROCESS 失效
公开(公告)号：JPS60234912A
公开(公告)日：1985-11-21
申请号：JP9087884
申请日：1984-05-09
申请人： NIPPON STEEL CORP
发明人： KIMURA KATSUICHI , KOGA SUMIAKI , NISHIMURA MITSUHIKO , KIYOUJIMA YOSHIYUKI
IPC分类号： C21C5/30 , C21C5/32 , C21C5/34 , C21C5/35
摘要： PURPOSE:To increase the temp. of molten iron by decarbonization and to increase the blending ratio of scrap iron by using molten iron which is previously desiliconized, dephosphorized, and desulfurized as an iron source, using essentially bottom blowing of oxygen, and forming a dent in an appropriate depth on the surface of molten iron by top blowing of oxygen in steel making. CONSTITUTION:A bottom blowing oxygen tuyere 3 is provided to a vessel obtained by lining an iron shell 1 with a refractory material 2, and a top blowing oxygen lance 4 is provided to a top and bottom-blown oxygen steel making furnace. Molten pig 5 which is previously desiliconized, dephosphorized, and desulfurized is used as an essential iron source, and the decarbonization is carried out essentially by bottom blowing of oxygen in the top and bottom-blown steel making process. In said steel making process, the flow rate of the top-blown oxygen is regulated to

4. 发明专利

JPS63266014A OXYGEN TOP/BOTTOM BLOWING STEEL MAKING METHOD 失效
公开(公告)号：JPS63266014A
公开(公告)日：1988-11-02
申请号：JP7276888
申请日：1988-03-26
申请人： NIPPON STEEL CORP
发明人： KOGA SUMIAKI , KIMURA KATSUICHI , NISHIMURA MITSUHIKO , KYOJIMA YOSHIYUKI
IPC分类号： C21C5/35 , C21C5/30
摘要： PURPOSE:To execute slag-less decarbonization at high decarbonizing and temp. rising rates by executing oxygen top/bottom blowing steel making to molten iron as a main iron source, to which desiliconizing, dephosphorizing and desulfurizing treatments are beforehand executed, by oxygen bottom blowing as a main decarbonized refining means. CONSTITUTION:In an oxygen top/bottom blowing steel making furnace, lining refractory 2 on an iron shell 1 and arranging the bottom blowing tuyeres 3 for blowing oxygen and a top blowing lance 4, the desiliconizing, dephosphorizing and desulfurizing treated molten iron 5 is used as the main iron source and further the iron scrap, etc., is added to execute decarbonized steel making. In the above oxygen top/bottom blowing steel making method, while stirring the molten iron 5 by oxygen bottom blowing from the bottom blowing tuyere 3, mainly decarbonizing treatment is executed. Further, by oxygen top blowing through the lance 4, mainly secondary combustion of carbon is promoted to achieve high decarbonizing and temp. rising rates. Then, depth of dent 6 formed on the molten iron 5 surface by the top blowing is adjusted as an index of the top oxygen blowing intensity. By this method, the decarbonizing and temp. rising rates are controlled and blending ratio of iron scrap is improved.

5. 发明专利

JPS63154248A CONTINUOUS CASTING APPARATUS FOR STEEL 失效
公开(公告)号：JPS63154248A
公开(公告)日：1988-06-27
申请号：JP29827786
申请日：1986-12-15
申请人： NIPPON STEEL CORP
发明人： KIMURA KATSUICHI
IPC分类号： B22D11/12 , B22D11/16
摘要： PURPOSE:To reduce the segregation and to improve the quality of product by controlling temp. at desired position of cast slab center part in continuous casting machine. CONSTITUTION:The temps. at the front and the rear of heating device are measured in order by temp. detector 3 and compared with presetting value by a control device 4, and immediately this difference is converted into an electrical signal, to give to each part of each heating device 5. In this way, each heating device 5 is respectively decided to heating rate, to start the heating. After a short time since starting the heating, the difference with the setting value at the front and the rear of the heating device is become to a few, and variation of heating rate is become to little, and so the cooling velocity can be stably controlled. The length of heating device is different in accordance with the demanded level for steel quality, but basically it is arranged as far as the front of pinch rolls.

6. 发明专利

JPS6223047B2 失效
公开(公告)号：JPS6223047B2
公开(公告)日：1987-05-21
申请号：JP9087884
申请日：1984-05-09
申请人： NIPPON STEEL CORP
发明人： KIMURA KATSUICHI , KOGA SUMIAKI , NISHIMURA MITSUHIKO , KYOJIMA YOSHUKI
IPC分类号： C21C5/30 , C21C5/32 , C21C5/34 , C21C5/35

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