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1. 发明专利

JPH05138314A NOZZLE FOR CONTINUOUS CASTING AND METHOD FOR POURING MOLTEN METAL 失效
公开(公告)号：JPH05138314A
公开(公告)日：1993-06-01
申请号：JP30438091
申请日：1991-11-20
申请人： KAWASAKI STEEL CO , KAWASAKI REFRACTORIES CO LTD
发明人： NARA MASAKATSU , BESSHO NAGAYASU , FUJII TETSUYA , YAMAZAKI HISAO , TAKESHITA SHIGEYUKI , SHINTANI HIROTAKA
IPC分类号： B22D11/10 , B22D11/103 , B22D41/54 , C21C7/00
摘要： PURPOSE:To produce a high quality cast slab by applying raw material being suitable to each position according to action at each part in an immersion nozzle. CONSTITUTION:According to the action of each part of the immersion nozzle 1, the raw material being suitable to each position, i.e., apart from the main body, a composite immersion nozzle is made by using a refractory material composed of binder of SiC+C (10-25wt.%) and ZrO2 (69-90wt.%) at the neighborhood of a meniscus of the molten steel and using binder of Al2O3 (45-60wt.%), SiO2 (25-45wt.%) and C (15-25wt.%) at the surroundings of a discharging port of the nozzle. By this method, the entrapment of bubbles into a solidified shell is prevented and the cast slab having excellent quality can be produced.

2. 发明专利

JPH11156497A METHOD FOR CONTINUOUSLY CASTING MOLTEN METAL AND APPARATUS THEREFOR 失效
公开(公告)号：JPH11156497A
公开(公告)日：1999-06-15
申请号：JP33269697
申请日：1997-12-03
申请人： KAWASAKI STEEL CO
发明人： NARA MASAKATSU , TANMACHI KENICHI , KISHIMOTO YASUO
IPC分类号： B22D11/04 , B22D11/10 , B22D11/11 , B22D11/112 , B22D11/114 , B22D11/115 , B22D11/116
摘要： PROBLEM TO BE SOLVED: To efficiently produce a high quality cast slab by converging at least a part of magnetic leakage flux of a coil with a core member composed of the magnetic material including in a superconducting coil. SOLUTION: The magnetic leakage flux of the coil (c) is converged by arranging the core member (magnetic material having high magnetic permeability and high magnetic flux density) J included in the coil (c) in at least a part of the back surface of the superconducting coil (c), and a closed magnetic circuit is formed by connecting with both magnetic materials. Since the superconducting coil (c) is mutually attracted with the magnetic material at the back surface thereof, the supports 6, 7 for holding the coil core member can further be minimized. The magnetic leakage flux in the range of 1.5 m in the circumference of the rear end zone of the superconducting coil (c) is

3. 发明专利

JPH10193057A METHOD FOR CONTINUOUSLY CASTING STEEL SLAG 失效
公开(公告)号：JPH10193057A
公开(公告)日：1998-07-28
申请号：JP617797
申请日：1997-01-17
申请人： KAWASAKI STEEL CO
发明人： NARA MASAKATSU , TANMACHI KENICHI
IPC分类号： B22D11/10 , B22D11/11 , B22D11/112 , B22D11/114 , B22D11/115 , B22D11/116
摘要： PROBLEM TO BE SOLVED: To drastically reduce the surface defect and the internal defect developed in a continuously cast slab and to obtain the redection of cost and the high productivity accompanied with the cleaning of the cast slab by impressing static magnetic field in the same direction as the casting direction to molten steel in the upper part of a mold and casting while simultaneously impressing the static magnetic field in the direction from one side to the other side of a long side wall to the molten steel in the lower part of the mold. SOLUTION: At the same time of impressing the static magnetic field in the casting direction by using a first static magnetic field generating device 3 arranged at the upper part of the mold 2, while impressing the static magnetic field so as to penetrate the molten steel from the one side long side wall 5 toward the other long side wall 5 by using a second static magnetic field generating device 4 arranged at the lower part of the mold 2, the molten steel is supplied into the mold 2 through a nozzle 1 to execute the continuous casting. Then, at the upper part of the mold 2, it is desirable to lower the magnetic flux density at the inner surface of the long side wall 5 to the center side of the thickness as low as possible. In this purpose, it is effective to arrange the gap between the first static magnetic field generating device 3 at the upper part of the mold 2 and the long side wall 5.

4. 发明专利

JPH10109147A METHOD FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JPH10109147A
公开(公告)日：1998-04-28
申请号：JP26414996
申请日：1996-10-04
申请人： KAWASAKI STEEL CO
发明人： HIRABAYASHI NOBUYASU , NARA MASAKATSU
IPC分类号： B22D11/10 , B22D11/103 , B22D11/114 , B22D11/115
摘要： PROBLEM TO BE SOLVED: To reduce the developing frequency of breakout and to improve the yield by using two straight immersion nozzles arranged in the long side direction in a mold with an interval and casting a cast slab having little defect of various kinds of inclusion with a high throughput. SOLUTION: Molten steel 5 after discharging, is electromagnetically braked by magnetic field impressed with a static magnetic field generating device 3b at the lower step and decelerated and dispersed in the periphery. A distance L1 between the adjacent nozzles is desirable to take so as to become 1-2 times of a distance L2 from a short side wall 1a to the nearest nozzle to the short side wall 1a. On the other hand, in the molten steel around the discharging flow, Lorentz's force is acted to an induced current generated in the descended spouting flow and the ascended flow toward a meniscus 4 is developed. Since the ascended flow is decelerated with the impressed magnetic field of a static magnetic field generating device 3a at the upper step, the disturbance of the meniscus 4 is not developed and therefore, the entrapment of mold powder into the molten steel is eliminated and the mold powder base inclusion defect in the cast slab is reduced.

5. 发明专利

JPH09295111A METHOD FOR CONTINUOUSLY CASTING STEEL UTILIZING STATIC MAGNETIC FIELD 失效
公开(公告)号：JPH09295111A
公开(公告)日：1997-11-18
申请号：JP10704896
申请日：1996-04-26
申请人： KAWASAKI STEEL CO
发明人： NARA MASAKATSU , BESSHO NAGAYASU , FUJII TETSUYA , KARIYA KAZUHIRO , KATAOKA KUNIHIKO , KITANO YOSHIHISA
IPC分类号： B22D41/54 , B22D11/10 , B22D11/114 , B22D11/115 , B22D27/02
摘要： PROBLEM TO BE SOLVED: To uniformize molten steel stream and to enable the casting of a continuously cast slab having good quality by using a single hole nozzle composed of a complex material difficult-to-sticking inclusion on the tip end part or the inner and the outer surfaces and impressing static magnetic field between mutual long side walls during supplying the molten steel. SOLUTION: A continuous casting mold 1 is composed of a pair of short side walls 1a and a pair of long side walls 1b. A straight immersion nozzle 2 is composed of the complex material difficult-to-sticking the inclusion on the tip end part or the inner and the outer surfaces, and the rear end part thereof has an opened spouting hole 2a and connects with a tundish. A static magnetic field generator 3 arranged at the back surfaces of the long side walls 1b in the continuous casting mold 1 generates the static magnetic field from the long side wall 1b toward the other side of the long side wall and the molten steel spouted from the immersion nozzle 2 is decelerated and the variation of the molten steel surface is restrained to prevent the entrapment of powder. Almost uniform stream is developed at the range C near non-magnetic field and the molten steel is further decelerated with the static magnetic field generator 4 to make the uniformized descending stream. By this method, the product quality and the productivity can be improved.

6. 发明专利

JPH0620616B2 失效
公开(公告)号：JPH0620616B2
公开(公告)日：1994-03-23
申请号：JP27993589
申请日：1989-10-30
申请人： KAWASAKI STEEL CO
发明人： SATO TOORU , MORITO NOBUYUKI , SHIBUYA KYOSHI , NARA MASAKATSU
IPC分类号： B22D11/06

7. 发明专利

JPH05104218A METHOD FOR CONTINUOUS CASTING STEEL SLAB USING PROGRESSIVE MAGNETIC FIELD 失效
公开(公告)号：JPH05104218A
公开(公告)日：1993-04-27
申请号：JP26482991
申请日：1991-10-14
申请人： KAWASAKI STEEL CO
发明人： BESSHO NAGAYASU , FUJII TETSUYA , NARA MASAKATSU , YAMAZAKI HISAO
IPC分类号： B22D11/10 , B22D11/11 , B22D11/112 , B22D11/115 , B22D11/116
摘要： PURPOSE:To prevent inclusions and bubbles in molten steel from invading deep into a mold and mold powder from entrapping into the molten steel due to the molten steel spouting flow discharged into the mold through a discharging hole of an immersion nozzle. CONSTITUTION:Progressive magnetic field is applied on the upper or lower part to the casting direction by means of magnetic poles 3 arranged over the whole width of back face of long sides 1b of the mold. In the case of applying the magnetic field on the upper part, the inclusions and bubbles are prevented from invading deep into the molten steel in the mold due to the molten steel spouting flow from the discharging hole 2a arranged at the lower part of the immersion nozzle 2. Further, in the case of applying this on the lower part, the entrapping of the mold powder at the meniscus 5 into the molten steel is prevented. A cast slab without any defect caused by the inclusions and the bubbles can thus be produced.

8. 发明专利

JPH0596350A METHOD FOR CONTINUOUSLY CASTING STEEL USING MAGNETOSTATIC FIELD CONDUCTING METHOD 失效
公开(公告)号：JPH0596350A
公开(公告)日：1993-04-20
申请号：JP25731191
申请日：1991-10-04
申请人： KAWASAKI STEEL CO
发明人： BESSHO NAGAYASU , FUJII TETSUYA , NARA MASAKATSU , YAMAZAKI HISAO
IPC分类号： B22D11/10 , B22D11/11 , B22D11/112 , B22D11/115 , B22D11/116 , B22D11/18 , B22D27/02
摘要： PURPOSE:To prevent the deterioration of the quality of a cast slab caused by catching of mold powder, etc., into molten steel or a solidified shell at the initial stage. CONSTITUTION:In a method for executing a continuous casting to the steel while applying the brake to the spouting flow of the molten steel discharged from a nozzle 2 by generating the magnetostatic field with magnetic poles 3 fitted to a mold 1, the continuous casting is executed while variably adjusting the loading direction of electromagnetic force by giving the magnetostatic field at near the meniscus of the mold and at the same time, by impressing DC current. By this method, the internal defect and the surface defect of the cast slab 5 can remarkably be reduced.

9. 发明专利

JPH0577007A METHOD FOR CONTINUOUSLY CASTING STEEL SLAB USING STATIC MAGNETIC FIELD 失效
公开(公告)号：JPH0577007A
公开(公告)日：1993-03-30
申请号：JP24607791
申请日：1991-09-25
申请人： KAWASAKI STEEL CO
发明人： YAMAZAKI HISAO , BESSHO NAGAYASU , FUJII TETSUYA , NARA MASAKATSU
IPC分类号： B22D11/04 , B22D11/041 , B22D11/10 , B22D11/11 , B22D11/112 , B22D11/115 , B22D11/116
摘要： PURPOSE:To prevent the clogging of a nozzle caused by the sticking of alumina to a discharging hole in an immersion nozzle and also, to prevent the trapping of inclusions poured together with a molten steel in a mold into a solidified shell by intruding into the deep position of a crater. CONSTITUTION:By immersing the straight immersion nozzle 2 opening the tip part of the nozzle body into the continuous casting mold 1, the molten steel is poured and also, a lower part static magnetic field generator 3 and an upper part static magnetic field generator 5 are disposed at the lower part and the upper part from the lower end of the immersion nozzle 2 at the back of the long side 1b in the mold 1, respectively. By the lower part static magnetic field generator 3, the downward discharging molten steel flow from the nozzle 2 is controlled, and by the upper part static magnetic field generator 5, the variation of the molten steel formed in meniscus direction is controlled.

10. 发明专利

JPH04356337A MEANDERING CONTROL METHOD FOR EXTREMELY THIN METALLIC STRIP 失效
公开(公告)号：JPH04356337A
公开(公告)日：1992-12-10
申请号：JP12741891
申请日：1991-05-30
申请人： KAWASAKI STEEL CO
发明人： SATO TORU , SHIBUYA KIYOSHI , NARA MASAKATSU , OZAWA MICHIHARU
IPC分类号： B22D11/06 , B22D11/10 , B22D11/16 , B22D11/20 , B65H23/032
摘要： PURPOSE:To prevent the meandering of a quenched metallic thin strip at the time of guiding and carrying the quenched metallic thin strip manufactured by a single roll method, etc., from a cooling single roll to a take-up machine. CONSTITUTION:A thin strip 5 quenched and solidified by a cooling roll 7 and peeled off by air 8 is guided by the suction force of an aspirator 6 to a pinch roll consisting of a solid roll 1 and a brunch roll 2 and caught by the pinch roll, and thereafter, carried to the take-up machine and by providing a gas blowing nozzle 3 immediately before the pinch roll, the meandering of the thin strip 5 is controlled by blowing blowing gas 4 to the surface of the thin strip 5.

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