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1. 发明专利

JPH11170022A METHOD FOR COOLING CAST SLAB IN CONTINUOUS CASTING 失效
公开(公告)号：JPH11170022A
公开(公告)日：1999-06-29
申请号：JP33692097
申请日：1997-12-08
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI , NOMURA HIROSHI , NISHIKAWA HIROSHI , TAKAO TANSEI , SUGISAWA MOTOTATSU
IPC分类号： B22D11/00 , B22D11/22
摘要： PROBLEM TO BE SOLVED: To prevent the variation of molten metal surface in a mold developed at the initial stage of casting having high hot strength and to enable the starting of stable casting by holding secondary cooling water temp. to the bottom part of a cast slab at the initial stage of the casting at a specific value. SOLUTION: The cast slab 4 drawn from the mold 1 with a dummy bar 3 is bent at the B end where roll group 2 is arranged curvedly and drawn. The cast slab 4 drawn from the mold 1 is cooled immediately with the secondary cooling water but at this time, in the case of the steel having high hot strength, the cast slab 4 at the bottom part is hardened and made to be difficult to be bent, therefore, the roll group 2 and the cast slab 4 are mutually and strongly interfered to cause what is called stepping phenomenon and the drawing speed of the cast slab is varied. In such a case, the strength of the cast slab is sufficiently lowered by holding the secondary cooling water temp. at >=35 deg.C, and since the cast slab is sufficiently and easily bent at the bending part and straightening part, the stepped part is not developed.

2. 发明专利

JPH06154961A CONTINUOUS CASTING METHOD FOR EXTRA-LOW-CARBON STEEL 失效
公开(公告)号：JPH06154961A
公开(公告)日：1994-06-03
申请号：JP34160192
申请日：1992-11-27
申请人： KAWASAKI STEEL CO
发明人： OKUDA HARUYUKI , SEKIGUCHI HIROSHI
IPC分类号： B22D11/10 , B22D11/108 , B22D11/111 , C21C7/00 , C21C7/076
摘要： PURPOSE:To prevent the carburization from molding powder to extra-low-carbon molten steel of a post charged by charging powder contg. an oxygen generating material before the end of casting of a precharge and providing a solidified partition wall after the end of casting. CONSTITUTION:The molding powder contg. the material generating oxygen in a melting stage is charged into a casting mold from >=10 minutes before the end of casting of the low-carbon or middle-carbon steel of a post charge in continuous casting of different steel kinds. The solidified partition wall of the precharge is formed by charging partition hardware after the end of the casting. Premelted carbon-free coating powder is charged onto this solidified partition wall. In succession, the normal casting of the extra-low-carbon steel of the post charge is started. The C-contg. granular or powder molding powder is successively charged. The molding powder contg. the material to generate the oxygen in the melting stage is preferably molding powder contg. 1 to 5wt.% KNO3 or 5 to 20% MnO2.

3. 发明专利

JPH067908A DEVICE FOR ADDING MOLTEN POWDER INTO CONTINUOUS CASTING DEVICE 失效
公开(公告)号：JPH067908A
公开(公告)日：1994-01-18
申请号：JP16630892
申请日：1992-06-24
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI , OKUDA HARUYUKI , TAKE HIDEO
IPC分类号： B22D11/10 , B22D11/108
摘要： PURPOSE:To reduce the sticking of powder and to improve the yield by allowing at least a molten powder passage surface in an adding passage through which the powders for molten steel in a continuous casting pass to be made of paper. CONSTITUTION:The molten powder E for the continuous casting melted in a vessel D for melting is added on the upper surface of the molten steel G in a mold C in the continuous casting device through a through-like adding passage 1 by using a tilting device F such as a hydraulic cylinder. At least the molten powder passage surface in the adding passage 1 is made to be the paper-made sleeve having smooth surface and high density. Thus, the lowering of the temp. of the molten slag is restrained by the excellent heat-insulating property of the paper-made adding passage and sticking amount of the powder is reduced and further, since the handling in improved with the reduction in weight, the cost in every respect such as the yield, working time can be reduced.

4. 发明专利

JPH067907A PRODUCTION OF CONTINUOUSLY CAST SLAB EXCELLENT IN SURFACE CHARACTERISTIC 失效
公开(公告)号：JPH067907A
公开(公告)日：1994-01-18
申请号：JP16911592
申请日：1992-06-26
申请人： KAWASAKI STEEL CO
发明人： YAMAZAKI HISAO , BESSHO NAGAYASU , TAGUCHI SEIJI , SEKIGUCHI HIROSHI
IPC分类号： B22D11/08 , B22D11/10 , B22D11/108 , B22D11/111
摘要： PURPOSE:To improve the surface characteristic of a cast slab in an unsteady condition at the time of starting a casting. CONSTITUTION:At the time of pouring a molten steel 8 into a mold 4 from a tundish 7, mold powder 1 added into the mold 4 is beforehand melted by using a melting furnace 2. After adding the molten mold powder 1 into the mold 4 simultaneously with the of start of the casting, electrodes 3 are dipped in the molten layer and energized, and the lowering of temp. is prevented by Joule heat generated in the powder layer, and the molten thickness of the powder is secured. Therefore, since the powder layer melted at the starting time is secured, the surface characteristic of the cast slab can be improved.

5. 发明专利

JPH04111951A METHOD FOR PROTECTING FLUX LINE IN CONTINUOUSLY TEMPERATURE MEASURING PROTECT TUBE FOR MOLTEN STEEL IN TUNDISH 失效
公开(公告)号：JPH04111951A
公开(公告)日：1992-04-13
申请号：JP22815390
申请日：1990-08-31
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI
IPC分类号： G01J5/02 , B22D11/10 , B22D11/108 , B22D11/11 , B22D11/111 , B22D11/112 , B22D11/116 , B22D11/117 , G01J5/00
摘要： PURPOSE:To accurately and continuously measure molten steel temp. by immersing a temp. measuring protect tube surrounded with a float-type sleeve in a tundish, spreading flux on the molten steel and holding the molten steel surface in the float-type sleeve to exposed surface. CONSTITUTION:The temp. measuring protect tube 2 providing a temp. sensor is surrounded with the float-type sleeve 3 having inner diameter larger than diameter of the protect tube. Under this condition, the temp. measuring tube 2 is immersed into the molten steel 4 in the tundish and also the float-type sleeve 3 is floated up on the molten steel, 4. Successively, the flux 5 is spread on the molten steel 4 in the tundish. Then, the molten steel surface in the float- type sleeve 3 is kept to the exposed surface, in which the flux 5 does not exist. By this method, local erosion of the temp. measuring protect tube caused by the flux can be reduced.

6. 发明专利

JPH03221247A METHOD FOR REPLACING AIR TO NON-OXIDIZED ATMOSPHERE IN TUNDISH FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH03221247A
公开(公告)日：1991-09-30
申请号：JP1616890
申请日：1990-01-29
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI , UMADA HAJIME
IPC分类号： B22D11/10
摘要： PURPOSE:To efficiently replace air to non-oxidized atmosphere and to improve working ratio of a continuous casting machine by inserting a reverse T shaped gas blowing pipe into near bottom face of a tundish from an opening hole for gas burner and softly blowing argon gas to the horizontal direction from the tip part thereof. CONSTITUTION:The reverse T shaped gas blowing pipe 3 connected and supported with a gas supplying pipe 11 through combustible material of a paper- made connecting cylinder 9 from the opening hole 6 for burner in a tundish cover 2 is inserted into near the bottom face of tundish body 1, and gap between the opening hole 6 for burner and the gas supplying pipe 3 is sealed with a sealing material 13. The Ar gas is supplied from the gas supplying pipe 11 and at the time of softly blowing the Ar gas to the horizontal direction from the tip part of reverse T shaped gas blowing pipe 3, the Ar gas having sp. gr. larger than that of the air, is spread to lower space of the tundish body 1 and stayed. Therefore, the Ar gas efficiently replaces the air into the non- oxidized atmospheric condition with piston model, which the air having small sp. gr. is gradually pushed out to the upper space in the tundish body 1.

7. 发明专利

JP2002129227A VACUUM-REFINING METHOD FOR Al-CONTAINING MOLTEN STEEL 失效
公开(公告)号：JP2002129227A
公开(公告)日：2002-05-09
申请号：JP2000323804
申请日：2000-10-24
申请人： KAWASAKI STEEL CO
发明人： KASHIWA TAKAYUKI , SEKIGUCHI HIROSHI
IPC分类号： C21C7/10 , C21C7/00 , C21C7/04
摘要： PROBLEM TO BE SOLVED: To provide an evacuating method with which the spattering of molten steel and the raise-up of the molten steel surface in a ladle can be prevented, in a process for reducing the pressure to a targeted vacuum degree by evacuation of a vacuum vessel when a vacuum-refining of an Al-containing steel is performed. SOLUTION: The pressure reducing speed in the vacuum vessel is set according to Al adding quantity per ton of the molten steel. Then, in the case of using W (kg/ton) as Al adding quantity and M (Pa/min) as pressure reducing speed, it is desirable to reduce the pressure within the range satisfying 0

8. 发明专利

JP2000017318A METHOD FOR EXTENDING SERVICE LIFE OF CONVERTER TYPE REFINING FURNACE 失效
公开(公告)号：JP2000017318A
公开(公告)日：2000-01-18
申请号：JP18724098
申请日：1998-07-02
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI , KITANO YOSHIHISA , MORIOKA HIROYASU
IPC分类号： C21C5/32 , C21C5/46 , C21C5/48
摘要： PROBLEM TO BE SOLVED: To effectively eliminate the unevenness of erosion of a refractory in the state of scarcely needing the investment of an equipment and to prolong the service life of furnace body in a converter by disposing plural oxygen spouting holes asymmetrically to the center axis of a lance and displacing the lance by a prescribed angle around the center axis according to the erosion of the lining refractory in the converter. SOLUTION: In the converter 1 covering the outermost shell with an iron shell 8 and lining the lining refractory 7 in the converter at the inside of the iron shell, oxygen is blown as gaseous oxygen jet 6 from a top-blown lance 5 and molten steel 3 and molten slag 4 are vigorously stirred to execute the active combustion action of carbon. At this time, since the lining refractory 7 is unevenly eroded by the high temp. generated with the combustion of the carbon and the erosion with the molten slag 4, the oxygen spouting holes 5a arranged at the tip part of the lance 5 are asymmetrically disposed. Then, the lance 5 is displaced by rotating so as to direct the direction where the oxygen jet intensity of the lance 5 is weak to the position having large erosion in the furnace based on the information in the furnace, and during blowing, the lance 5 is fixed.

9. 发明专利

JPH0679419A METHOD FOR ADDING POWDER IN CONTINUOUS CASTING OPERATION 失效
公开(公告)号：JPH0679419A
公开(公告)日：1994-03-22
申请号：JP1537592
申请日：1992-01-30
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI
IPC分类号： B22D11/10 , B22D11/108 , B22D11/111
摘要： PURPOSE:To provide an adding method for powder, in which the uniform molten powder layer can be formed at a molten steel meniscus from the initial stage starting the continuous casting operation. CONSTITUTION:The molten steel 2 from a tundish is supplied into the mold 3 in order. To the supplied molten steel 2, the powder 5 is spread from the upper part. This powder 5 is the one comprising essentially of CaO, SiO2, Al2O3, Na2O, F, etc., and is preheated at the temp. higher than the m.p. of the powder 5 by >=20 deg.C in a holding vessel 6 providing an electric furnace. Then the wt.%, etc., in the main components is adjusted beforehand so that the viscosity of the heated powder 5 becomes

10. 发明专利

JPH04228247A METHOD FOR STARTING POURING OF MOLTEN STEEL INTO TUNDISH FROM LADLE 失效
公开(公告)号：JPH04228247A
公开(公告)日：1992-08-18
申请号：JP40852690
申请日：1990-12-27
申请人： KAWASAKI STEEL CO
发明人： UMADA HAJIME , SEKIGUCHI HIROSHI , MISAKI NORIO , YUHARA SUSUMU , MATSUKAWA TOSHITANE
IPC分类号： B22D11/10 , B22D41/46
摘要： PURPOSE:To prevent contamination of molten steel with plugged sand packed into a molten steel discharging hole in order to prevent clogging of the molten steel discharging hole at the initial stage. CONSTITUTION:At the time of starting pouring of the molten steel, the molten steel discharging hole in a ladle 1 on a swing tower 8 is closed after a lapse of the time of several sec after discharging the plugging sand by opening a sliding nozzle 3. At the same time, by supplying inert gas into the sliding nozzle 3, the molten steel in the molten steel discharging hole is stirred to prevent the clogging caused by solidification. After completing the pouring of molten steel in the ladle 1' at the pouring position, the swing tower 8 is swung and the ladle 1 at the waiting position is shifted to the pouring position to start the pouring.

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