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1. 发明专利

JPH11347694A METHOD FOR REUSING IMMERSION NOZZLE FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH11347694A
公开(公告)日：1999-12-21
申请号：JP91199
申请日：1999-01-06
申请人： NIPPON KOKAN KK
发明人： FUJITA HIROKI , WATANABE KYOJI , KURANAGA TAICHI , MURAKI YASUNORI
IPC分类号： B22D11/10 , B22D41/52 , B22D41/54
摘要： PROBLEM TO BE SOLVED: To stably reuse an immersion nozzle by preventing the crack and the fall-out of the immersion nozzle in a continuous casting. SOLUTION: As for the reuse method of the immersion nozzle for continuous casting, made of Al2 O3 -C brick containing 35-80 wt.% Al2 O3 , 15-35 wt.% SiO2 , 5-40 wt.% C, in the main body part 2 and ZrO2 -C brick containing 60-85 wt.% ZrO2 , 5-40 wt.% C in the slag line part 3, in the case of a ratio a/b >=0.7 between the min. thickness (a) and the max. thickness (b) in the slag line before reusing, reuse can be executed under condition of the total use time =0.5, an antioxidant is coated on the slag line, reuse is available under condition of the total use time

2. 发明专利

JPH1147895A METHOD FOR PREHEATING TUNDISH FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH1147895A
公开(公告)日：1999-02-23
申请号：JP20276497
申请日：1997-07-29
申请人： NIPPON KOKAN KK
发明人： FUJITA HIROKI , ISHIGE TOSHIAKI , ITAKURA TAKASHI
IPC分类号： B22D11/10
摘要： PROBLEM TO BE SOLVED: To prevent the clogging of the flow-out hole in a sliding nozzle caused by the solidification of molten steel at the time of pouring into a mold after staying the molten steel in a tundish by a prescribed quantity for a prescribed time. SOLUTION: In a preheating method of the tundish 1 provided with the sliding nozzle 2 composed of a fixed plate 3 and a sliding plate 4 and forming the flow-out hole 8 in the inner part and holding the prescribed quantity of molten steel for the prescribed time while blowing inert gas into the flow-out hole 8 under closing condition of the sliding nozzle 2 before starting pouring into the mold, the preheating is executed with a gas burner 13 for >=120 min under opening condition of the sliding nozzle and successively, for >=30 min under closing condition of the sliding nozzle.

3. 发明专利

JP2001293543A METHOD FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JP2001293543A
公开(公告)日：2001-10-23
申请号：JP2000109113
申请日：2000-04-11
申请人： NIPPON KOKAN KK
发明人： FUJITA HIROKI , WATANABE KYOJI , KURANAGA TAICHI
IPC分类号： B22D11/111 , B22D11/059 , B22D11/108 , C21C7/076
摘要： PROBLEM TO BE SOLVED: To produce a cast slab having the sound surface by preventing the development of star-crack in the case of casting the cast slab by using high ultrabasic crystalline mold powder. SOLUTION: When a continuous casting is performed by using the mold powder having >1.4 basicity and 1.4 basicity and >=0.15 Pa.s viscosity at 1,300 deg.C, the casting is performed by using the mold copper plates coated with the coating layer at least at a part not higher than a position 300 mm above the lower end of the mold.

4. 发明专利

JPH10305351A MENDING METHOD OF CONTINUOUS CASTING MOLD 失效
公开(公告)号：JPH10305351A
公开(公告)日：1998-11-17
申请号：JP11797997
申请日：1997-05-08
申请人： NIPPON KOKAN KK
发明人： MURAKI YASUNORI , FUJITA HIROKI
IPC分类号： B22D11/04 , B22D11/057 , B22D11/059
摘要： PROBLEM TO BE SOLVED: To prolong the life of a mold while securing the quality of casted pieces by removing at least the flaw part or the deformation part of a mold by grinding a continuous casting mold, forming a plating layer over the ground part by electroplating of copper or copper alloy and by applying the plating finish procession. SOLUTION: A mold 2 is dismounted from a supporting frame 3, and then grind and remove the parts by a lathe and the like in a range including the flaw part or the deformation part. When the surface of the mold is plated with nickel and the like, the plating layer of nickel and the like is to be removed form at least in a range where an electroplating of copper or its alloy is to be applied. After the degreasing treatment, such as solvent degreasing and alkali degreasing, the grinded and removed part of the surface is completed, the electroplating of copper or its alloy is to be started acting as cathode. After the electroplating is finished, the plate layered surface is finish processed to a given shape; the surface of the layer doesn't have projections and depressions at the interface to the surface of the basic mold 2, and the plated surface has to be smooth.

5. 发明专利

JP2003129195A THICK ELECTROMAGNETIC SOFT-IRON SUPERIOR IN THE INSIDE PROPERTY, AND MANUFACTURING METHOD THEREFOR 审中-公开
公开(公告)号：JP2003129195A
公开(公告)日：2003-05-08
申请号：JP2001329428
申请日：2001-10-26
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA MISAO , FUJITA HIROKI , ISHIHARA YOSHIAKI , ABE TAKASHI
IPC分类号： C21D8/12 , C21D6/00 , C22C38/00 , C22C38/06 , H01F1/16
摘要： PROBLEM TO BE SOLVED: To provide a thick electromagnetic soft-iron superior in the inside property having little defect associated with voids, and provide a manufacturing method therefor. SOLUTION: The thickness electromagnetic soft-iron superior in the inside property is characterized by having such a composition that a difference between temperatures of a solid phase and a liquid phase in the solid-liquid phases coexisting state is less than 10 deg.C, making, in pure iron, an impurities quantity T(=340×C+5×Si+2×Mn+90×P+150×S, where C, Si, Mn, P, and S are mass% of each element included as the impurities) to be less than 10, and preferably making C to be 0.007% or less and N to be 0.007% or less. The manufacturing method comprises the steps of making the molten steel having the above composition to be a steel ingot, and heating it to 910 deg.C or higher.

6. 发明专利

JP2000202599A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JP2000202599A
公开(公告)日：2000-07-25
申请号：JP91499
申请日：1999-01-06
申请人： NIPPON KOKAN KK
发明人： YAMAMOTO HIRONORI , FUJITA HIROKI
IPC分类号： B22D11/10 , B22D41/50 , G05D9/12
摘要： PROBLEM TO BE SOLVED: To easily control the poured quantity of molten metal into a mold and also, to reduce the spouting flow speed of the molten metal from an immersion nozzle, in a continuous casting method directly pouring molten metal into the mold from a ladle without using a tundish. SOLUTION: The continuous casting equipment is provided with a first sliding nozzle 3 fitted to the bottom part of the ladle 2, a second sliding nozzle 5 fitting the immersion nozzle 6 to the lower part thereof and a long nozzle 4 connecting the first sliding nozzle with the second sliding nozzle. The molten metal in the ladle is poured into a mold 7 from the immersion nozzle through the first sliding nozzle, long nozzle and second sliding nozzle while forming the surface 10 of the molten metal 1 in the long nozzle by adjusting the opening degree of the first sliding nozzle and the second sliding nozzle.

7. 发明专利

JPH1190594A METHOD FOR FORCEDLY OPENING HOLE OF SLIDING NOZZLE FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH1190594A
公开(公告)日：1999-04-06
申请号：JP25323097
申请日：1997-09-18
申请人： NIPPON KOKAN KK
发明人： ITAKURA TAKASHI , FUJITA HIROKI
IPC分类号： B22D11/10
摘要： PROBLEM TO BE SOLVED: To forcedly open the hole by safely and quickly melting the clogging position with oxygen in case of stopping the flowing-out of molten metal into a mold by clogging the flowing-out hole caused by the solidification of the molten metal at the time of starting casting in a continuous casting in a tundish providing a sliding nozzle. SOLUTION: The gaseous mixture of oxygen and inert gas is blown into the flowing-out hole 10 from the upper surface of a sliding plate 6 in the sliding nozzle 4 and metal M is melted to open the hole. At this time, the effect to the prevention of damage of the sliding plate is further displayed by using the gaseous mixture having

8. 发明专利

JP2002153948A WIDTH CHANGEABLE MOLD FOR CONTINUOUS CASTING 失效
公开(公告)号：JP2002153948A
公开(公告)日：2002-05-28
申请号：JP2000354275
申请日：2000-11-21
申请人： NIPPON KOKAN KK
发明人： FUJITA HIROKI , WATANABE KYOJI , MAEDA HIROSHI
IPC分类号： B22D11/05 , B22D11/04
摘要： PROBLEM TO BE SOLVED: To restrain flaw developed on long side copper plates and short side copper plates according as variation of a cast slab width during continuous casting performed by moving the short sides of a mold. SOLUTION: In the width changeable mold 1 provided with the mutually faced one pair of long side copper plates 3 and one pair of short side copper plates 6 interposed with the long side copper plates and changeable to the long side copper plates, the thickness of the contacting surface between the sliding surfaces 10 of the short side copper plates and the long side copper plates, is made to 10-25 mm. As the other way, recessed grooves extended in the casting direction at the center parts of the sliding surfaces are set so that the thickness of the contacting surface between the sliding surfaces of the short side copper plates and the long side copper plates, becomes each 3-25 mm at both sides of the recessed grooves 11.

9. 发明专利

JP2002001499A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JP2002001499A
公开(公告)日：2002-01-08
申请号：JP2000188881
申请日：2000-06-23
申请人： NIPPON KOKAN KK , SHINAGAWA REFRACTORIES CO
发明人： WATANABE KYOJI , OSAKO TAKASHI , MAEDA HIROSHI , KATO AKIRA , FUJITA HIROKI , MORIWAKI MASAHIRO , YOSHIKAWA MICHITOKU
IPC分类号： B22D11/10 , B22D41/58
摘要： PROBLEM TO BE SOLVED: To provide a continuous casting method capable of improving the quality of a casting without choke of a nozzle. SOLUTION: When molten metal in a tundish is fed into a casting mold through an immersion nozzle having a spout, from a molten metal outflow opening to carry out continuous casting, a preheated gas is blown into the molten metal flowing in the immersed nozzle.

10. 发明专利

JPH11138244A SLIDING PLATE IN SLIDING NOZZLE DEVICE AND ITS REUSING METHOD 失效
公开(公告)号：JPH11138244A
公开(公告)日：1999-05-25
申请号：JP31643497
申请日：1997-10-31
申请人： NIPPON KOKAN KK , TOKYO YOGYO KK
发明人： ITAKURA TAKASHI , FUJITA HIROKI , INAGAKI KIMIO , HATSUTANDA HIROKATSU , NOGUCHI HIRONORI
IPC分类号： B22D37/00 , B22D11/10 , B22D41/42
摘要： PROBLEM TO BE SOLVED: To provide a sliding plate for starting pouring which can manufacture in comparatively low cost and can be low in the cost needed to change. SOLUTION: This sliding plate is composed of a refractory-made plate body 1 forming an opening hole 2 for pouring molten metal and an opening hole 3 for fitting a plug with a suitable interval and a gas blowing plug 4 fitted to the opening hole 3 for fitting the plug so as to be attachable/detachable. The gas blowing plug 4 is composed of a refractory-made plug body 40 and a metal-made case 41 covering the lower surface of this plug body 40 and at least the lower zone of the side surface and also, has a structure having the larger diameter than the diameter of the opening hole for pouring the molten metal in a fixed plate at an upper nozzle side contacting with the upper surface of the sliding plate A and connecting with a gas supplying tube 6 at the lower part of the metal-made case 41. Then, the gas blowing plug 4 is removed from the plate body 1 to enable the reuse.

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