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1. 发明专利

JPH08267203A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH08267203A
公开(公告)日：1996-10-15
申请号：JP7493095
申请日：1995-03-31
申请人： NIPPON STEEL CORP
发明人： SASAI KATSUHIRO , MIZUKAMI YOSHIMASA
IPC分类号： B22D11/16 , B22D11/10 , B22D41/58
摘要： PURPOSE: To prevent the development of crack in a gas blowing type immersion nozzle set with low gas flow rate and to improve and stabilize the quality of a cast slab by controlling gas back pressure so as to be lower pressure than that equivalent to the strength of the powder line part of the immersion nozzle which is regulated according to the casting time. CONSTITUTION: The target gaseous Ar back pressure equivalent to strength lower than that of the powder line part 4 in consideration of the safety factor is calculated according to the casting time from the relation between the pre-estimated casting time and the strength of the powder line part 4. The gaseous Ar back pressure 9 is read from a pressure gage fitted on the way of gaseous Ar introducing pipe 8 to the immersion nozzle 3 and the read value is compared with the target gaseous Ar back pressure, and the control of the gaseous Ar back pressure 9 is started from the point of time when both values become equal. During casting, the gas permeation characteristic value is continuously calculated and the gaseous Ar flow rate is continuously or intermittently adjusted to a value obtd. by multiplying this permeation characteristic value by the target gaseous Ar back pressure and then, the gaseous Ar back pressure 9 is controlled to the target gaseous Ar back pressure. The control is effected by the both of a automatic operation and a mannual operation.

2. 发明专利

JPH0833961A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH0833961A
公开(公告)日：1996-02-06
申请号：JP19131994
申请日：1994-07-22
申请人： NIPPON STEEL CORP
发明人： SASAI KATSUHIRO , MIZUKAMI YOSHIMASA
IPC分类号： C21C7/00 , B22D11/10 , B22D11/108 , B22D11/111 , C21C7/076
摘要： PURPOSE:To realize the casting free from the defects with inclusion by adding MnO, ferro manganese or the flux containing MnO to keep the MnO concentration in the slag within the prescribed range and prevent the alumina adhesion to the nozzle. CONSTITUTION:In the continuous casting of steel, MnO, ferro manganese or the flux containing MnO is added in the ladle slag or in the tundish slag. When the MnO concentration in the ladle slag is low, the alumina adhesion to the dipping nozzle is advanced to cause the defects with inclusion, while when the MnO concentration is high, the erosion of the dipping nozzle is advanced to cause the defects with inclusion due to the unstable discharge flow. Keeping the MnO concentration in the slag within the range of 15-50%, the defects with inclusions of the slab due to the alumina adhesion to the dipping nozzle and the unstable discharge flow is prevented, and the level of the molten steel in the mold is stable, and the quality is improved.

3. 发明专利

JPH07136746A IMMERSED NOZZLE FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH07136746A
公开(公告)日：1995-05-30
申请号：JP31104693
申请日：1993-11-18
申请人： NIPPON STEEL CORP
发明人： SASAI KATSUHIRO , MIZUKAMI YOSHIMASA
IPC分类号： B22D11/10 , C04B35/48
摘要： PURPOSE:To improve nozzle life by constituting the refractory composition of the powder line part of nozzle with the prescribed weight % of ZrO2, SiO2, C. CONSTITUTION:The erosion of immersed nozzle for continuous casting of steel is not caused by the phenomenon, in which ZrO2 and C is simply melted into powder, and is caused by the phenomenon, in which at beginning ZrO2 and part of C is reacted to be gasified, making the refractory composition porous. Therefore, the powder line part is constituted of the refractory having a composition consisting of, by weight, except industrially inevitable impurities, 60-95% ZrO2, 5%-40% SiO2,

4. 发明专利

JPH07118722A MOLTEN IRON DEPHOSPHORIZING AGENT 失效
公开(公告)号：JPH07118722A
公开(公告)日：1995-05-09
申请号：JP26656293
申请日：1993-10-25
申请人： NIPPON STEEL CORP
发明人： MUKAWA SUSUMU , MIZUKAMI YOSHIMASA
IPC分类号： C21C1/02
摘要： PURPOSE:To provide a CaO-base dephosphorizing agent to be used to refine molten iron in steel refining. CONSTITUTION:This molten iron dephosphorizing agent consists essentailly of quick lime, contains 10-30wt.% moisture and has 5-25vol.% porosity. The quick lime should be derived from calcium carbonate. This agent having >=5mm size exhibits a slag formation property equivalent to that of small-grain quick lime having

5. 发明专利

JPH0751822A HEAT INSULATING AGENT FOR MOLTEN STEEL SURFACE 失效
公开(公告)号：JPH0751822A
公开(公告)日：1995-02-28
申请号：JP22395993
申请日：1993-08-18
申请人： NIPPON STEEL CORP
发明人： SASAI KATSUHIRO , MIZUKAMI YOSHIMASA
IPC分类号： B22D7/10 , B22D11/10 , B22D11/108 , B22D11/111 , B22D27/06 , B22D41/00 , C04B35/04
摘要： PURPOSE:To surely prevent the contamination of molten steel caused by a reaction between the air oxidation and a heat insulating agent and further, to provide the heat insulating agent without damage and erosion to a refractory. CONSTITUTION:Ca is contained at 0.1-20% as the outer percentage in the heat insulating agent containing 0.5-1.0 CaO/Al2O3, 5-

6. 发明专利

JPH079099A METHOD FOR CONTINUOUSLY CASTING CAST SLAB HAVING NO DEFECT 失效
公开(公告)号：JPH079099A
公开(公告)日：1995-01-13
申请号：JP17583693
申请日：1993-06-24
申请人： NIPPON STEEL CORP
发明人： MIZUKAMI YOSHIMASA , YAMAMURA HIDEAKI
IPC分类号： B22D11/10 , B22D11/115 , B22D11/16
摘要： PURPOSE:To prevent the longitudinal crack by giving the alternating fluid in the right and the left directions in the rotating direction to molten steel on the interface of the solidification in a mold. CONSTITUTION:The molten steel is poured into the mold 2 from an immersion nozzle 4. Discharged flow 3 is generated at the surfaces (a), (b), (c), (d) of a cast slab, To an electromagnetic stirring flow 5 in the mold, at the surfaces (a), (c) of the cast slab, a reversing flow of the discharging flow coincides with the stirring flow in the direction and the flow speed at the interface of the solidification can be secured, but at the surfaces (b), (d) of the cast slab, the reversing flow 3 of the discharging flow is cancelled with the stirring flow 5 and the flow speed at the interface of the solidification can not be secured. Then, as the result, in which the rotating direction of the molten metal fluid at the interface of the solidification is alternated in the right and the left directions with the electromagnetic stirring device 1 in the mold, the longitudinal crack on the whole surfaces (a), (b), (c), (d) of the cast slab can be prevented, and the saving of repairing and the improvement of productivity can be obtd.

7. 发明专利

JPH06182513A METHOD FOR BLOWING GAS FROM IMMERSION NOZZLE FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH06182513A
公开(公告)日：1994-07-05
申请号：JP35542192
申请日：1992-12-21
申请人： NIPPON STEEL CORP
发明人： YAMAMURA HIDEAKI , MIZUKAMI YOSHIMASA
IPC分类号： B22D11/10
摘要： PURPOSE:To stably cast a base stock for steel plate without bulging defect even if the casting time elapsed by securing the blowing gas flow rate necessary to prevent the clogging of an immersion nozzle in the continuous casting of molten steel. CONSTITUTION:An electrode 8 is arranged in the molten steel 3 and AC or DC current is sent between an inner hold body 5 in the gas blowing part of the immersion nozzle 4 and the molten steel 3' in the nozzle from an electric source 9. By this method, even if an alteration layer in the inner hold body is generated after the lapse of a casting time, bubbles of small diameter can be blown from the inner hold body, and the generation of the bulging defect can be prevented. Further, the floating-up separation of inclusion with bubbles and the prevention of the nozzle clogging can further efficiently be executed.

8. 发明专利

JPH0621287B2 失效
公开(公告)号：JPH0621287B2
公开(公告)日：1994-03-23
申请号：JP25281084
申请日：1984-12-01
申请人： NIPPON STEEL CORP
发明人： TSUTSUMI NAOTO , MIZUKAMI YOSHIMASA , MURATA HIRONOBU , HORI TOSHIO
IPC分类号： C21C7/00 , C21C7/064 , C21C7/076

9. 发明专利

JPH05306418A 失效
公开(公告)号：JPH05306418A
公开(公告)日：1993-11-19
申请号：JP31437792
申请日：1992-10-30
申请人： NIPPON STEEL CORP
发明人： YAMAMURA HIDEAKI , MIZUKAMI YOSHIMASA
IPC分类号： C21C7/072 , B22D43/00 , C22B9/05
摘要： PURPOSE:To effectively remove impurities, such as gas components, non-metallic inclusions in molten metal by impressing AC current between a part producing gas bubbles and the molten metal, and controlling the diameter of the bubbles. CONSTITUTION:At the time of blowing the gas G into the molten steel in a ladle 1 from a nozzle 3 in the bottom part, bubbles 9 are produced in the molten steel 2. An AC current is supplied into the molten steel 2 in the direction of producing the bubbles 9 through an electrode 6 dipped into the molten steel 2 and an electrode 7 set around the nozzle 3 by an AC power source 8. By this current supply, electromagnetic force is generated in the molten steel 2. The electromagnetic force is applied inside toward the center of the current on the plane at the right angle to the current direction to give the molten steel 2 the pressure. Since the current is AC, the electromagnetic force is changed with the lapse of time and the gas G is drifted away from the nozzle 3 to make the bubbles 9. By making the frequency of the AC current high and making the bubble leaving interval short, the diameter of the bubbles 9 is made small.

10. 发明专利

JPH05185182A METHOD FOR DEVELOPING BUBBLES IN MOLTEN METAL 失效
公开(公告)号：JPH05185182A
公开(公告)日：1993-07-27
申请号：JP2335692
申请日：1992-01-14
申请人： NIPPON STEEL CORP
发明人： YAMAMURA HIDEAKI , MIZUKAMI YOSHIMASA
IPC分类号： B22D1/00 , B22D11/10 , B22D11/11 , B22D11/112 , B22D11/116 , B22D11/117 , B22D43/00 , C21C7/072 , C22B9/05
摘要： PURPOSE:To control the diameter of bubbles in molten metal by impressing static magnetic field orthogonal to the developing direction of the bubbles and AC current in the developing direction of the bubbles. CONSTITUTION:The molten steel 2 is filled in a ladle 1, and by blowing gas G from a nozzle 3, the bubbles 9 are developed. At the side wall surface in a bottom part of the ladle 1, one pair of static magnetic field generating devices 4, 5 are arranged to generate the static magnetic field from the N pole toward the S pole in the horizontal direction. By AC power source 8, the AC current is conducted in the molten steel 2 in the bubble developing direction through an electrode 6 dipped into the molten steel 2 above the nozzle 3 in the ladle 1 and an electrode 7 around the nozzle 3. By changing the frequency of the AC current, the diameter of the bubbles can be controlled.

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