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1. 发明专利

JPH06179957A METHOD AND DEVICE FOR COATING HOT-DIP COATED STEEL SHEET 失效
公开(公告)号：JPH06179957A
公开(公告)日：1994-06-28
申请号：JP35331192
申请日：1992-12-11
申请人： NIPPON KOKAN KK
发明人： SATO TOSHIO , ISHII TOSHIO , SUZUKAWA YUTAKA , OKUBO YUTAKA , YADA AKIRA , SUGIYAMA SHUNICHI
IPC分类号： C23C2/20 , C23C2/24
摘要： PURPOSE:To maintain smooth finish surfaces obtd. by gas-wiping while preventing the warp and the vibration of a hot-dip coated steel sheet and to enable the uniform coating at a high speed. CONSTITUTION:High frequency current conductive passages 1b are arranged in gas wiping nozzles 3 at both sides of the steel sheet S and also magnetic shield plates 6 covering both surfaces of both edge parts of the steel sheet are arranged so as to approach to the steel sheet surface. By energizing the high frequency current having the same phase in so sufficient quantity that the steel sheet S can magnetically be saturated to each high frequency conductive passage 1b, the high frequency current having the reverse phase is induced in the steel sheet S. The magnetic pressure worked on the steel sheet S surface is generated by mutual action between the induction current and the current in the high frequency current conductive passages 1b to prevent the warp and the vibration of the steel sheet. Together with this pressure, Lorentz force generated on the steel sheet S is cooperated with the gas from the nozzle 3 and the magnetic field in the high frequency current conductive passages 1b is shielded with the magnetic shield plates 6. Then, while controlling intensity of the Lorentz force at both edge parts of the steel plate, the coating on the steel sheet S is executed.

2. 发明专利

JPH06179956A METHOD AND DEVICE FOR COATING HOT-DIP COATED STEEL SHEET 失效
公开(公告)号：JPH06179956A
公开(公告)日：1994-06-28
申请号：JP35331092
申请日：1992-12-11
申请人： NIPPON KOKAN KK
发明人： SATO TOSHIO , ISHII TOSHIO , SUZUKAWA YUTAKA , OKUBO YUTAKA , YADA AKIRA , SUGIYAMA SHUNICHI
IPC分类号： C23C2/20 , C23C2/24
摘要： PURPOSE:To enable a smooth and uniform coating at a high speed by arranging high frequency current conductive passages at both edge parts in the width direction of a steel sheet near gas wiping nozzles and energizing the high frequency current having the large same phase to the passages. CONSTITUTION:Gas is injected on the steel sheet S drawn up from hot dipping bath 3 from the gas wiping nozzles 1 to remove the excess molten metal stuck to the both surfaces. In a control method for the coating rate, the high frequency current conductive passages 4a paralleled to the steel sheet surfaces and mutually faced while inserting the steel sheet S are arranged at both edge part position in the width direction of the steel sheet near the gas wiping nozzle 1. To the conductive passage 4a pair, the high frequency current having the same phase in such sufficient quantity that the steel sheet S can magnetically be saturated, is energized to induce the high frequency current having the reverse phase in the steel sheet S. By this method, while preventing the vibration of the steel sheet S by generating magnetic pressure, the centering is executed. Further, the generated Lorentz force is cooperated with the gas from the gas wiping nozzles 1 to execute the wiping to the molten metal at the edge parts.

3. 发明专利

JPH0557401A DEVICE FOR CONTINUOUSLY CASTING CAST BILLET 失效
公开(公告)号：JPH0557401A
公开(公告)日：1993-03-09
申请号：JP22606491
申请日：1991-09-05
申请人： NIPPON KOKAN KK
发明人： SATO TOSHIO , SUGIYAMA SHUNICHI , YADA AKIRA , NAKADA MASAYUKI , OSAKO TAKASHI , MORI KENTARO
IPC分类号： B22D11/04
摘要： PURPOSE:To cast a cast billet excellent in surface property without using large capacity of a high frequency induction power source for high frequency induction coil. CONSTITUTION:In a continuous casting device for cast billet connecting a refractory nozzle 2 and a water cooling mold 3, a magnetic field amplifying plate 4 is provided on the connected part of the refractory nozzle 2 and the mold 3 and also the high frequency induction coil 5 is provided in the vicinity of the magnetic field amplifying plate 4, and on the magnetic field amplifying plate 4, the part for preventing conduction of induction current generated from the high frequency induction coil 5 is provided. Thus, the induction current is made to flow in the inner peripheral side of the magnetic field amplifying plate 4 (inside of the connected part of the refractory nozzle 2 and the mold 3), and even in the case large current is not conducted to the high frequency induction coil 5, large magnetic pressure is generated in the inside of the connection part to form a space 8, the connection part and the molten steel 6 are made in a non-contact condition. Therefore, in an upstream zone from the mold 3, solidification of the molten steel 6 is not occurred and the cast billet excellent in surface property is produced.

4. 发明专利

JPH01255610A SMELTING REDUCTION METHOD FOR IRON 失效
公开(公告)号：JPH01255610A
公开(公告)日：1989-10-12
申请号：JP8348888
申请日：1988-04-05
申请人： NIPPON KOKAN KK
发明人： USUI TSUTOMU , NISHIOKA SHINICHI , KAWAI YOSHIHIKO , SUGIYAMA SHUNICHI , YADA AKIRA
IPC分类号： C21B11/02 , C21B13/00 , C21B13/02
摘要： PURPOSE:To execute heat conduction to molten iron at high efficiency and to execute smelting reduction of iron raw material in the molten iron by blowing gas for stirring from nozzles at bottom wall into the molten iron in a horizontal type refining furnace and also oxygen from lances at top part and the oxygen into slag layer from nozzle holes at lower part side wall of the lance. CONSTITUTION:Nitrogen gas is blown into the molten iron 7 from plural pieces of the nozzles 9 at the bottom wall in the horizontal refining furnace 5 to execute stirring, and the oxygen for decarbonizing is blown into the molten iron from the lower ends of plural pieces of the lances 6 at top part. By this method, decarbonizing reaction is executed in the molten iron 7 with coal supplied from a supplying tube 10 to generate CO. At the same time, the oxygen for secondary combustion is blown into the slag layer 8 from plural nozzle holes at each lower part side wall of the lance 6 to execute secondary combustion of the CO gas, which is generated in the molten iron 7, in the slag layer 8. The heat generated with the secondary combustion is conducted from the slag layer 8 into the molten iron 7, to raise the molten iron 7 temp. By this method, the smelting reduction is executed to the iron ore continuously supplied from the supplying tube 10 at good efficiency in the molten iron 7.

5. 发明专利

JPS61266158A CONTINUOUS CASTING METHOD FOR METALLIC STRIP 失效
公开(公告)号：JPS61266158A
公开(公告)日：1986-11-25
申请号：JP10578385
申请日：1985-05-20
申请人： NIPPON KOKAN KK
发明人： YADA AKIRA , SATO HIROAKI , KAMIO HIROSHI , FUKUDA SHUZO , OZEKI AKIYA , NISHIOKA SHINICHI
IPC分类号： B22D11/06
摘要： PURPOSE:To obtain a metallic strip having an excellent surface characteristic by stirring forcibly a molten metal in a vessel near a cooling drum thereby narrowing the overcooling region of the molten metal formed near the drum and decreasing the solidified nuclei separated and suspended from the solidified layer. CONSTITUTION:The metallic strip 5 is continuously cast by bringing the molten metal 4 in a vessel 2 into contact with the cooling drum 1 under rotation and sticking the solidified layer of the molten metal 4 on the outside peripheral surface of the drum 1. A stirring mechanism 7 is provided to the top end of a spout 3 of the vessel 2 and the molten metal 4 is forcibly stirred near the drum 1 by means of plural stirring bars 9. As a result, the overcooling region of the molten metal 4 formed near the drum 1 is narrowed and the solidified nuclei separated from the solidified layer and suspended in the overcooling region are considerably decreased. The problem of the sticking of the solidified nuclei on the surface of the solidified layer is thus solved and the metallic strip having the excellent surface characteristic is obtd.

6. 发明专利

JPS61193759A COOLING METHOD FOR CONTINUOUS CASTING OF LONGITUDINALLY UNIDIRECTIONALLY SOLIDIFIED BILLET 失效
公开(公告)号：JPS61193759A
公开(公告)日：1986-08-28
申请号：JP3440585
申请日：1985-02-25
申请人： NIPPON KOKAN KK
发明人： KAMIO HIROSHI , YADA AKIRA , FUKUDA SHUZO , SATO HIROAKI , HOSHIDA TATSUO , KUNIOKA KAZUO
IPC分类号： B22D11/04 , B22D11/124
摘要： PURPOSE:To improve cooling capacity by inclining the direction of cooling water ejection ports at a prescribed angle relative to the radial line and setting the prescribed angle relative to the center of a cylinder as well. CONSTITUTION:The cooling water supplied to a spacing 3 between double cylinders from a cooling water supply pipe 8 is ejected to a horizontally drawn billet 7 by which the billet is cooled. The ejection ports 6 are so bored as to incline at the prescribed angle theta1 relative to the radial line direction of the cylinders and are so bored as to form the angle theta2 in the axial line direction of the inside cylinder 2 as well. The preferable angle theta2 is about 45 deg. and a suitable angle to generate swirling flow is set for the angle theta1. The cooling water is given with the angular momentum in the circumferential direction and the momentum in the outlet side direction of the device by the above- mentioned method. Since the swirling flow along the billet surface is formed in the cooling water even after the collision against the billet 7 in the above- mentioned manner, the cooling capacity is improved.

7. 发明专利

JPH051362A METHOD FOR PREVENTING VIBRATION AND WARP OF STEEL SHEET CONTINUOUSLY PASSING THROUGH 失效
公开(公告)号：JPH051362A
公开(公告)日：1993-01-08
申请号：JP18041991
申请日：1991-06-25
申请人： NIPPON KOKAN KK
发明人： SATO TOSHIO , ISHII TOSHIO , SUGIYAMA SHUNICHI , YADA AKIRA
IPC分类号： C23C2/26 , C25D7/06
摘要： PURPOSE:To provide the method, by which warp and vibration of a steel sheet continuously passing through can be effectively restrained under non-contact with a comparatively simple device. CONSTITUTION:At the front face side and back face side of the steel sheet 1 continuously passing through, high-frequency current conducting passages 2a, 2b parallel to the steel sheet 1 surface are set near the steel sheet 1 surfaces so as to almost face to each other while inserting the steel sheet between them, and also at the outer part of both sides in the width direction of the steel sheet 1 near these high-frequency current conducting passages 2a, 2b, an N pole and an S pole of magnets are set so as to almost face to each other while inserting the width direction of the steel sheet 1 between them, and under condition of sufficiently saturating magnetically the steel sheet 1 with the magnets, by conducting high-frequency current having the same phase in the above high-frequency current conducting passages 2a, 2b at the front face side and the back face side of the steel sheet, the high-frequency current having the reverse phase is induced in the steel sheet 1. By interaction between this induction current and the high-frequency current in the above each high-frequency current conducting passage, magnetic pressure acting on the steel sheet surface is generated to restrain the warp and the vibration in the width direction of the steel sheet 1 with the magnetic pressure acting on both surfaces of the steel sheet 1.

8. 发明专利

JPH051361A METHOD FOR PREVENTING VIBRATION AND WARP OF STEEL SHEET CONTINUOUSLY PASSING THROUGH 失效
公开(公告)号：JPH051361A
公开(公告)日：1993-01-08
申请号：JP18041791
申请日：1991-06-25
申请人： NIPPON KOKAN KK
发明人： SATO TOSHIO , ISHII TOSHIO , SUGIYAMA SHUNICHI , YADA AKIRA
IPC分类号： C23C2/26 , C25D7/06
摘要： PURPOSE:To provide the method, by which warp and vibration of a steel sheet continuously passing through can be effectively restrained under non-contact with a comparatively simple device. CONSTITUTION:At the front face side and back face side of the steel sheet S continuously passing through, high-frequency current conducting passages 1a, 1b parallel to the steel sheet surfaces are set near the steel sheet S, and by conducting high-frequency current sufficient to saturate magnetically the steel sheet S into each of high-frequency current conducting passages 1a, 1b, reverse phase of the high-frequency current is induced in the steel sheet. By interaction between this induction current and the high-frequency current in the above each current conducting passage, magnetic pressure acting on the steel sheet surface is generated to restrain the warp and the vibration in width direction of the steel sheet S with the magnetic pressure acting on both surface of the steel sheet S.

9. 发明专利

JPH04178248A CONTINUOUS CASTING DEVICE FOR STEEL PLATE 失效
公开(公告)号：JPH04178248A
公开(公告)日：1992-06-25
申请号：JP30661890
申请日：1990-11-13
申请人： NIPPON KOKAN KK
发明人： SATO TOSHIO , YADA AKIRA , SUGIYAMA SHUNICHI , NAKADA MASAYUKI , OSAKO TAKASHI , MORI KENTARO
IPC分类号： B22D11/06
摘要： PURPOSE:To obtain a steel plate favorable in surface property in a stable state by arranging a magnetic field converging plate outside a weir along the neighborhood of a triple point part wherein horizontal cooling rolls, the weir and molten metal come in contact with one another, providing a high frequency coil near this converging plate and installing cooling boxes to the magnetic field converging plate. CONSTITUTION:The magnetic field converging plate 9 is arranged outside the weir along the neighborhood of the triple point part wherein horizontal cooling rolls 1a, 1b come in contact with the weir 3 and molten metal, the high frequency coil 5 is provided near this converging plate, and the cooling boxes 10, 11 are installed to the magnetic field converging plate. When the magnetic field converging plate is arranged, the magnetic field generated by the high frequency coil do not diverge in the air, passes through the center of the magnetic field converging plate and converged. Then, when the magnetic field converging plate is arranged along the neighborhood of the triple point part near the high frequency coil, the magnetic field is converged near the triple point and a high magnetic pressure can be actuated efficiently. Soft magnetic material is used as magnetic field converging plate material and silicon steel plate, etc., are suitable. Thus, a large magnetic pressure is generated at the triple point part to obtain the steel plate excellent in surface property in a stable state.

10. 发明专利

JPH01255613A SMELTING REDUCTION METHOD FOR IRON 失效
公开(公告)号：JPH01255613A
公开(公告)日：1989-10-12
申请号：JP8349188
申请日：1988-04-05
申请人： NIPPON KOKAN KK
发明人： NISHIOKA SHINICHI , USUI TSUTOMU , KAWAI YOSHIHIKO , SUGIYAMA SHUNICHI , YADA AKIRA
IPC分类号： C21B11/02 , C21B13/00 , C21B13/02
摘要： PURPOSE:To stably improve heat conducting efficiency into molten iron by executing the operation so as to satisfy the inequality in smelting reduction method, which heat generated with secondary combustion in slag layer is conducted to the molten iron. CONSTITUTION:Gas is blown into the molten iron 7 from bottom blowing nozzles 11 at bottom wall in a smelting furnace 6 and stirred and oxygen for decarbonizing is blown into the molten iron 7 from a lance 9 at top part and the oxygen for secondary combustion is blown into the slag layer 8 from plural nozzles 10 at the side wall of the smelting furnace 6, to conduct the secondary combustion heat in the slag layer 8 into the molten iron 7 and execute the smelting reduction of the iron. In this smelting reduction, the operation is executed so as to satisfy the inequality, and wherein, alpha: secondary combustion ratio in the furnace, eta: heat conducting efficiency of heat generated with the secondary combustion into the molten iron, Li: length (m) of the secondary combustion zone in the slag layer caused by oxygen for secondary combustion blown from No.(i) oxygen blowing nozzle, (n) : number pieces of the oxygen blowing nozzles, V9: superficial velocity (Nm /h) of exhaust gas in the smelting furnace. By this method, while conducting heat in the molten iron 7 at high efficiency, the smelting reduction of the iron raw material is executed in the molten iron. 7.

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