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1. 发明专利

JP2002066702A CONTINUOUS CASTING METHOD OF AL-KILLED STEEL 失效
公开(公告)号：JP2002066702A
公开(公告)日：2002-03-05
申请号：JP2000247292
申请日：2000-08-17
申请人： NIPPON KOKAN KK
发明人： MAEDA HIROSHI , ISHIGE TOSHIAKI
IPC分类号： B22D11/108 , B22D11/00 , B22D11/10 , C21C7/00 , C21C7/04
摘要： PROBLEM TO BE SOLVED: To prevent a nozzle from being clogged with Al2O3 and CaS, controlling Ca content in the most appropriate range in relation to chemical composition of molten steel during continuous casting of Al-killed steel. SOLUTION: For S content of less than 0.005 mass % in Al-killed steel, Ca content is controlled to 0.0015 mass % or more adding metallic Ca or Ca- alloy in the molten steel. For S content of 0.005 mass % or more in Al-killed steel, Ca content is controlled to 0.0015 mass % or more but not mere than [0.004-0.11×S content (mass %) in molten steel] mass % adding metallic Ca or Ca alloy in the molten steel. Then the molten steel is cast into a mold via an immersion-type tundish nozzle.

2. 发明专利

JPH0979909A METHOD FOR MEASURING TEMPERATURE OF HOT MOLTEN MATERIAL 失效
公开(公告)号：JPH0979909A
公开(公告)日：1997-03-28
申请号：JP23358095
申请日：1995-09-12
申请人： NIPPON KOKAN KK
发明人： KISHU TAKAFUMI , OSUMI AKIRA , MAEDA HIROSHI , YAMASHITA HAJIME , MIYAHARA HIROAKI , YAMANAKA ZENKICHI
IPC分类号： G01J5/00 , G01J5/08 , G01J5/10
摘要： PROBLEM TO BE SOLVED: To provide a method by which the temperature of a hot molten material can be measured stably for a long period. SOLUTION: At the time of measuring the temperature of a hot molten material, a temperature measuring instrument 1 is moved to a temperature measuring position immediately above a tundish 14. The detecting section 3 composed of the optical fiber of a radiation thermometer 2 is housed in a guide tube 8 and the front end of the section 3 is protruding from the tube 8 by 0-30 mm. Then the guide tube 8 is positioned above the surface of molten steel 13 so as to prevent the tube 8 from coming into contact with the surface of the molten steel 13 and stopped and maintained perpendicularly to the surface of the molten steel 13. Then the detecting section of the instrument 1 is dipped in the molten steel 13 so as to measure the temperature of the molten steel 13 by rotating a pinch roll 10 in the normal direction. After measurement, the detecting section 3 is pulled up from the molten steel 13 and housed in the tube 8 as quickly as possible.

3. 发明专利

JPH08294762A METHOD FOR CONTROLLING CONTINUOUS CASTING OPERATION 失效
公开(公告)号：JPH08294762A
公开(公告)日：1996-11-12
申请号：JP32876595
申请日：1995-12-18
申请人： NIPPON KOKAN KK
发明人： TEZUKA KOICHI , NAGAMUNE AKIO , MAEDA HIROSHI , MIYAHARA HIROAKI
IPC分类号： B22D11/16 , B22D11/18
摘要： PURPOSE: To provide a method for controlling a continuous casting operation, by which a molten steel surface level in a mol is suitably controlled in the continuous casting operation. CONSTITUTION: At the time of starting the casting in the continuous casting equipment operation, first and second electrodes 1, 2 are inserted in the mold 7 and a prescribed signal is inputted to the first electrode 1. The prescribed signal transferred to the second electrode 2 through the molten steel 10 poured into the mold 7 and brought into contact with the first and second electrodes is received, and the molten steel surface level in the mold and this rising speed are measured based on the change of time delay caused by propagation of the prescribed signal. At the point of time when the molten steel surface level in the mold 7 reaches a prescribe position, the drawing of a cast slab is started and a drawing speed and molten steel pouring rate from a tundish are adjusted based on the molten steel surface level in the mold 7 and the rising speed to control the molten steel surface level in the mold, and this molten steel pouring operation is shifted to a stationary operation.

4. 发明专利

JPH0833964A CONTINUOUS CASTING METHOD OF HIGH NI STEEL 失效
公开(公告)号：JPH0833964A
公开(公告)日：1996-02-06
申请号：JP19003794
申请日：1994-07-20
申请人： NIPPON KOKAN KK
发明人： NAKADA MASAYUKI , NAKAJIMA HIROHISA , ISHIGE TOSHIAKI , ITAKURA TAKASHI , SUZUKI KATSUNORI , MAEDA HIROSHI , TADA MITSUHIRO , NISHIOKA SHINICHI
IPC分类号： B22D11/00 , B22D11/124 , B22D11/16 , B22D11/20 , B22D11/22 , C21D9/52 , C22C38/00 , C22C38/08
摘要： PURPOSE:To prevent the intergranular cracks and the surface cracks in the continuous casting method of high Ni steel. CONSTITUTION:In the continuous casting of Ni: 8-10wt.% steel by a vertical-- bending mold continuous casting machine, the minimum value T1 of the surface temperature at the corner part of the slab in the mold, the period of time (t) from the time when the slab leaves the mold to the time when the slab reaches the upper correcting zone, and the mean value T2 of the surface temperature at the corner part of the slab from the time when the slab leaves the mold to the time when the slab reaches the upper correcting zone are calculated. The reduction of area at the casting is estimated from the calculated minimum value T1, the period of time (t), the mean value T2, and the pre-measured reduction of area for the cast high Ni steel, and the casting speed Vc and the secondary cooling intensity W are controlled so that this reduction of area may be >=50%.

5. 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.

6. 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.

7. 发明专利

JP2000210761A CONTINUOUS CASTING METHOD, MOLTEN METAL POURING MECHANISM AND MOLTEN METAL POURING METHOD 失效
公开(公告)号：JP2000210761A
公开(公告)日：2000-08-02
申请号：JP32737799
申请日：1999-11-17
申请人： NIPPON KOKAN KK , SHINAGAWA REFRACTORIES CO
发明人： KATO AKIRA , WATANABE KYOJI , KURANAGA TAICHI , MURAKI YASUNORI , SHIBUYA KIYOBUMI , OSAKO TAKASHI , MAEDA HIROSHI , KUWANO SEIGO , MORIWAKI MASAHIRO , YOSHIKAWA MICHITOKU
IPC分类号： B22D11/10 , B22D41/36 , B22D41/42 , B22D41/50 , B22D41/60
摘要： PROBLEM TO BE SOLVED: To provide a continuous steel casting method by which the time for pouring the molten steel into a tundish can be extended in the state of closing a sliding nozzle. SOLUTION: When the molten steel in the tundish 1 is supplied into a mold from a molten steel pouring hole 3 provided at the bottom part through an upper nozzle 4, sliding nozzle 5 and immersion nozzle 6 and continuously cast, the upper nozzle 4 is heated to >=800 deg.C by a heater 21 provided inside the upper nozzle 4 and the sliding nozzle 5 is heated to >=500 deg.C by the heater provided inside the sliding nozzle 5, or the gas heated to >=600 deg.C through the sliding nozzle 5 is supplied into the molten steel, thereby the molten steel is poured into the tundish 1 in the state of closing the sliding nozzle 5, while stirring the molten steel, and then the sliding nozzle 5 is opened to start the casting.

8. 发明专利

JPH09166495A TEMPERATURE MEASURING DEVICE FOR MOLTEN METAL 失效
公开(公告)号：JPH09166495A
公开(公告)日：1997-06-24
申请号：JP32751095
申请日：1995-12-15
申请人： NIPPON KOKAN KK
发明人： MIYAHARA HIROAKI , NIMURA YOICHI , ITAKURA TAKASHI , MAEDA HIROSHI
IPC分类号： G01J5/02 , G01J5/00 , G01J5/08
摘要： PROBLEM TO BE SOLVED: To obtain a device for measuring the temperature of molten metal at a certain depth time-sequentially. SOLUTION: The temperature measuring device consists of a cylindrical holder with a through hole at the tip, a consumption-type metal pipe-covered optical fiber 2 which is inserted into the cylindrical holder and is dipped in a molten metal, and an optical fiber supply means 4 for feeding the consumption type metal pipe-covered optical fiber 2 to the above molten metal. In this case, the optical fiber supply means 4 is constituted of a double-rod-type air cylinder 10 where through holes for supplying the optical fiber 2 is provided from one rod 8 to another rod 9 at the center of a cylinder rod and a chuck 11 for fixing the optical fiber 2 to the rod 9, thus accurately measuring the temperature of the molten metal.

9. 发明专利

JPH08294754A METHOD FOR CONTROLLING AUTOMATIC START OF CONTINUOUS CASTING AND DEVICE THEREFOR 失效
公开(公告)号：JPH08294754A
公开(公告)日：1996-11-12
申请号：JP1519496
申请日：1996-01-31
申请人： NIPPON KOKAN KK
发明人： OTA ATSUSHI , MIYAHARA HIROAKI , MAEDA HIROSHI , OSUMI AKIRA
IPC分类号： B22D11/08 , B22D11/16 , B22D11/18
摘要： PURPOSE: To prevent the development of a defective cast slab caused by the entrapment of inclusion by continuously measuring molten steel surface just after pouring the molten steel into a mold and controlling a flow rate of the molten steel from the difference between the level rising speed calculated from the variation of the molten steel surface and a reference speed. CONSTITUTION: When the wt. of the molten steel detected with a tundish weigher 7 reaches a preset value by pouring molten steel from a ladle to a tundish 9, a stopper 8 is fully opened by driving a stepping cylinder 4 through a casting control unit 3 to pour the molten steel. The molten steel surface level is continuously measured with an electrode type molten steel surface meter 2 and the molten steel surface rising speed is calculated based on this variation, and this calculated molten steel surface rising speed actual value is inputted to the casting control unit 3 and compared with the pre-inputted optimum target molten steel surface rising speed which does not entrap the inclusion. An opening degree correcting value is outputted through the casting control unit 3 so that the difference between the both becomes zero to make the stopper 8 a prescribed opening degree. By this method, the cast slab without entraping the inclusion can be produced.

10. 发明专利

JPH0775863A AUTOMATIC DETECTING DEVICE FOR SHORTAGE OF POWDER IN MOLD MOUTH 失效
公开(公告)号：JPH0775863A
公开(公告)日：1995-03-20
申请号：JP22236393
申请日：1993-09-07
申请人： NIPPON KOKAN KK
发明人： TAKAHASHI MASANOBU , KAZAMA AKIRA , MAEDA HIROSHI
IPC分类号： B22D11/10 , B22D11/108 , B22D11/111 , B22D11/16 , G01F23/22
摘要： PURPOSE:To obtain an automatic detecting device for shortage of powder by eliminating the influence of burning flame of powder, splashed molten steel, etc., and having high reliability. CONSTITUTION:The device is provided with ITV camera 1 to photograph the inside of mold, A/D conversion device 3 to convert the picture signal photographed by ITV camera to the digital signal for each picture element and a min luminance picture synthetic operating means 7, to input the picture signal of each picture element outputted from A/D conversion device, to select a min level one among plural picture elements at the same position among plural picture signals inputted in a specific time, to produce the synthetic picture based on the picture element values at the position. Further the device is provided with the powder shortage detecting means to execute judgment of powder shortage based on the synthetic picture produced by the min. luminance picture synthetic operating means 7.

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