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1. 发明专利

JP2000343208A SLIDING IMMERSED NOZZLE 失效
公开(公告)号：JP2000343208A
公开(公告)日：2000-12-12
申请号：JP15578799
申请日：1999-06-02
申请人： KUROSAKI HARIMA CORP , NIPPON STEEL CORP
发明人： INOUE YUKIO , MIWA MASUYUKI , HIRATANI ISAO , SUKENARI SHIRO , OTSUKA YOSHIAKI
IPC分类号： B22D11/10 , B22D41/50 , B22D41/56
摘要： PROBLEM TO BE SOLVED: To prevent generation of cracks of a neck part without leakage of steel from a sliding surface, and impeding the sliding condition in the case of changing an immersed nozzle provided with the sliding surface to be applied to a device to change the immersed nozzle without interrupting a casting work. SOLUTION: A castable refractory material is filled in a gap between both ends of a head part along at least the sliding direction of an immersed nozzle 1 and a metal case, a regular-shaped refractory material is arranged thereon, a sliding surface flush with a sliding surface 3 on an upper surface of the head part of the immersed nozzle 1 is formed on the upper surface of this refractory, and a releasing material is interposed on a contact surface of the refractory arranged in the gap between both ends of the head part along at least the sliding surface of the immersed nozzle 1 and the metal case with both ends of the head part of the immersed nozzle.

2. 发明专利

JP2001030047A IMMERSION NOZZLE HAVING SLIDING SURFACE 失效
公开(公告)号：JP2001030047A
公开(公告)日：2001-02-06
申请号：JP20599199
申请日：1999-07-21
申请人： KUROSAKI HARIMA CORP , NIPPON STEEL CORP
发明人： SHIN TAKAAKI , HIRAIWA YOSHITAKA , MIZOBE ARIHITO , MIURA TSUTOMU , KANEKO TOSHIAKI , SUKENARI SHIRO , OTSUKA YOSHIAKI
IPC分类号： B22D11/10 , B22D41/54 , B22D41/56 , C04B35/63 , C04B35/634 , C04B35/66
摘要： PROBLEM TO BE SOLVED: To restrain the crack of an immersion nozzle caused by the difference of thermal expansion at using time joining and integrating a sliding plate brick and the immersion nozzle through mortar containing the respective specified ratios of refractory raw material powder, low m.p. glass having a specified temp. of softening point, low m.p. metallic powder and an organic binder. SOLUTION: The sliding plate brick 1 and the immersion nozzle 2 are joined through the mortar 3 containing 40-90 wt.% refractory raw material powder, 1-30 wt.% low m.p. glass having 300-1000 deg.C softening point, 1-10 wt.% low m.p. metallic powder and 7-30 wt.% organic binder. The refractory raw material is desirable to be the composition of 50-99 wt.% alumina-containing raw material 1-10 wt.% clay and =60 wt.%, and the low m.p. metal is aluminum or aluminum alloy in consideration of a handling problem and the corrosion resistance after generating the oxide.

3. 发明专利

JP2000317626A METHOD FOR PREHEATING IMMERSION NOZZLE FOR CONTINUOUS CASTING 失效
公开(公告)号：JP2000317626A
公开(公告)日：2000-11-21
申请号：JP13113599
申请日：1999-05-12
申请人： NIPPON STEEL CORP
发明人： OTSUKA YOSHIAKI , NAKAYAMA TOSHIO
IPC分类号： B22D11/10 , B22D41/60
摘要： PROBLEM TO BE SOLVED: To prevent the damage of a nozzle inner hole body without developing the positive pressure in a slit by executing a second preheating while supplying inert gas after executing a first preheating in a specified time under the atmospheric opening state of a gas supplying tube communicated with the slit part of the nozzle. SOLUTION: The inert gas such as Ar introduced from the metal-made screwed gas supplying tube 1, is supplied through the gas blowing slit 3 into the refractory-made inner hole body 4 arranged on the inner wall of the nozzle refractory 2 made of alumina-graphite, etc., and gas film is formed on the inner wall of the nozzle to protect the nozzle from passed molten steel by turning to a non-contacting state. In this gas blowing type immersion nozzle for continuous casting, before casting, this nozzle refractory 2 is preheated to prevent the spalling. At this time, the gas supplying tube 1 is opened to the outer part of the atmosphere or reduced in the pressure, and preheated at 400-600 deg.C by (t) min shown with 0.357A =1100 deg.C while supplying the inert gas.

4. 发明专利

JPH1129894A METHOD FOR PLATING MOLD PIECE USED IN CONTINUOUS CASTING 失效
公开(公告)号：JPH1129894A
公开(公告)日：1999-02-02
申请号：JP20075197
申请日：1997-07-09
申请人： MISHIMA KOSAN CO LTD , NIPPON STEEL CORP
发明人： OTSUKA YOSHIAKI , HATANO KESAYOSHI , TERAOKA SAKAE , MATSUO MASAAKI
IPC分类号： C25D3/12 , B22D11/04 , B22D11/059 , C25D5/34 , C25F3/04
摘要： PROBLEM TO BE SOLVED: To enhance the adhesion of a nickel plating on the surface and to prevent the exposure of a copper base material by electrolytically etching the base material of copper or copper alloy in an aq. alkali soln. to remove the work-altered layer on the surface and then applying a nickel plating. SOLUTION: The base material of the mold piece consisting of copper or copper alloy is brushed with an alkali soln. to remove the oil and the contaminant on the surface. The base material is then pickled, and the copper base material with the surface activated is electrolytically etched by the use of an alkali soln. and electropolished. The part of the copper base material other than the inside surface is coated with an insulating material such as synthetic resin and electrically insulated. The base material, which the work-altered layer on the surface is removed, is washed with water to remove the depositing electrolyte and pickled to activate its surface, and then the inside surface of the base material is plated with nickel. Otherwise, the nickel plating layer is formed over the whole surface extending from the lower part to upper part of the long side of a casting mold.

5. 发明专利

JPH0938753A TUNDISH FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH0938753A
公开(公告)日：1997-02-10
申请号：JP21127195
申请日：1995-07-28
申请人： NIPPON STEEL CORP
发明人： HIROKAWA YUICHI , KIMURA KOHEI , OTSUKA YOSHIAKI , KASHIO SHIGEKI , ENDO KOICHI
IPC分类号： B22D43/00 , B22D11/10
摘要： PROBLEM TO BE SOLVED: To remove inclusion flowed in accompanied with molten steel from a molten steel supplying nozzle by forming molten steel flowing passage arranging panel-like weir having size satisfying a specific condition as a zigzag state in a tundish for continuous casting. SOLUTION: In the tundish 2 for continuous casting arranging wide lower weirs 1 having flat upper surface in the width direction between the molten steel supplying nozzle 5 for supplying the molten steel from the upper part and a molten steel ejecting nozzle 3 arranged at the bottom part, the panel-like weirs 4 are arranged on the wide lower weirs 1 as the zigzag state in the width direction of the wide lower weirs 1 so that the width length of the panel-like weir 4 becomes 0.5-0.7 times of the width length of the wide lower weir 1 and the height of the panel-like weir 4 becomes 0.4-0.8 times of the height of the wide lower weir 1 to form the molten steel flowing passage. In this result, the inclusion flowed in accompanied with the molten steel from the molten steel supplying nozzle 5 can surely be flowed up and removed in the suitable productivity.

6. 发明专利

JP2000233265A METHOD FOR DECIDING QUALITY OF CONTINUOUSLY CAST SLAB 失效
公开(公告)号：JP2000233265A
公开(公告)日：2000-08-29
申请号：JP3387199
申请日：1999-02-12
申请人： NIPPON STEEL CORP
发明人： KATAI TAKAHIRO , OTSUKA YOSHIAKI , IMOTO TAKEO , IIBOSHI HIROAKI
IPC分类号： B22D11/16
摘要： PROBLEM TO BE SOLVED: To provide a method for casting a cast slab excellent in cleanliness by deciding the internal quality defect caused by non-metallic inclusion from variable factors in the operation in a continuous casting process. SOLUTION: In the continuous casting process, in the case the molten steel surface level in a mold becomes a reference value A or higher of the preset molten steel surface level variable amount or in the case the molten steel surface level variable amount is less than the preset reference value A and the opening degree variable amount in a molten steel pouring quantity adjusting device from a tundish into the mold is a reference value B or higher, it is decided that the quality of the cast slab is abnormal. Further, in the case the molten steel surface level is less than the reference value A and the opening degree variable amount in the molten steel pouring quantity adjusting device is less than the reference value B, it is decided that the cast slab is normal.

7. 发明专利

JPH09295107A METHOD FOR PREVENTING MIXING OF INCLUSION AT THE TIME OF FLOWING OUT OF MOLTEN METAL 失效
公开(公告)号：JPH09295107A
公开(公告)日：1997-11-18
申请号：JP12935896
申请日：1996-04-26
申请人： NIPPON STEEL CORP
发明人： KANEKO KATSUSHI , OTSUKA YOSHIAKI
IPC分类号： B22D11/10 , B22D11/103 , B22D11/11 , B22D11/112 , B22D11/116 , B22D11/117 , B22D11/119 , B22D11/18
摘要： PROBLEM TO BE SOLVED: To prevent the mixture of an inclusion into molten metal in a mold by making the supplying quantity from a molten metal housing vessel to a receiving vessel more than the supplying quantity from the receiving vessel to a mold and equalizing the supplying quantity from the housing vessel with the supplying quantity from the receiving vessel after setting the opening degree to

8. 发明专利

JPH0976055A METHOD FOR CONTINUOUS HOT USE OF TUNDISH 失效
公开(公告)号：JPH0976055A
公开(公告)日：1997-03-25
申请号：JP25946595
申请日：1995-09-13
申请人： NIPPON STEEL CORP
发明人： HIROKAWA YUICHI , OTSUKA YOSHIAKI , SHIGEMATSU KIYOSHI
IPC分类号： B22D41/00 , B22D11/10 , B22D41/005 , B22D43/00
摘要： PROBLEM TO BE SOLVED: To provide a method for continuous hot use of a tundish in which the cost for the refractory of the tundish for continuous casting is reduced, the maintenance process in the cold condition is dispensed with, and the slab of stable quality is obtained without giving loads on the equipment and operation to secure the quality. SOLUTION: In a tundish whose inner surface is formed of the prescribed refractory, and which is used to pour the molten steel flowing from a molten steel ladle into a mold from a dipping nozzle, when the tundish is continuously used a plurality of times, the slag and the metal left during the casting are discharged, and then, the tundish is kept at 1000-1100 deg.C to be used for the next casting after the tundish is cooled at the cooling speed of 5-10 deg.C/min until the surface temperature of the slag and the metal stuck to the inner wall of the tundish reaches 1000-1150 deg.C.

9. 发明专利

JPH079104A METHOD FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JPH079104A
公开(公告)日：1995-01-13
申请号：JP17583493
申请日：1993-06-24
申请人： NIPPON STEEL CORP
发明人： OTSUKA YOSHIAKI , IIBOSHI HIROAKI , KASHIO SHIGEKI
IPC分类号： B22D11/07 , B22D11/16
摘要： PURPOSE:To provide a means for fixing the oscillating condition of a mold in order to uniformly flow mold powder between the mold and a cast slab. CONSTITUTION:At the time of using the mold powder having uiscosity of 2-8 poise at 1300 deg.C solidified temp., the oscillation of the mold and/or oscillation stroke, the deviation Dp of unit consumption of the powder is used as the index, and this DP is adjusted to the range shown in the following inequalities to continuously cast a steel. The deviation Dp of unit consumption of the powder: difference between the max. value and the min. value of the mold powder during one stroke of the mold flowed into gap between the mold and the cast slab. In the case of being [C] %, Dp %, Dp

10. 发明专利

JPH11156490A METHOD FOR REPAIRING MOLD PIECE USED FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH11156490A
公开(公告)日：1999-06-15
申请号：JP34409497
申请日：1997-11-29
申请人： MISHIMA KOSAN CO LTD , NIPPON STEEL CORP
发明人： OTSUKA YOSHIAKI , HATANO KESAYOSHI , TERAOKA SAKAE , MATSUO MASAAKI
IPC分类号： B22D11/04 , B22D11/057 , B22D11/059
摘要： PROBLEM TO BE SOLVED: To provide a repairing method of a mold piece used for continuous casting with which the mold piece is repeatedly reused by positively repairing the eroded part. SOLUTION: In the repairing method of the mold pieces 10 used for the continuous casting in which a nickel plating layer 13 is applied on the whole inside surface and a chromium plating layer 14 on is applied the surface except the part below the nickel plating layer 13 and the eroded part generates near the boundary layer of the nickel plating layer 13 and the chromium plating layer 14 by using, a first process for forming a recessed part 17 by machining the eroded part in the mold piece 10 to remove the eroded part, a second process for buiding up the recessed part with the nickel plating, a third process for uniformly grinding the inner surface of the mold piece 10 built up with the nickel plating layer 18 and a fourth process for applying the chromium plating layer 20 in the surface uniformly ground on the inner surface except the lower part of the mold piece 10, are executed in order.

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