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1. 发明专利

JPH0687668A CASTABLE REFRACTORY 失效
公开(公告)号：JPH0687668A
公开(公告)日：1994-03-29
申请号：JP34992191
申请日：1991-12-10
申请人： TOSHIBA CERAMICS CO , WAKI TAIKA KOGYO KK , SUMITOMO METAL IND
发明人： NAKAMURA NOBORU , UEMOTO HIDEO , YAMAZAKI KEISUKE , SUMITOMO KEISUKE , TANGE MASAKI , KIGUCHI HIROSHI , URA KOICHI , HIRAYAMA KIYOE
IPC分类号： C04B35/66
摘要： PURPOSE:To ensure excellent slag wetting resistance and thermal shock resistance and to prolong useful life by incorporating a specified starting material for spinel, a specified starting material for alumina zirconia, alumina and a binder. CONSTITUTION:The castable refractories are obtd. by using a mixture consisting of 10-40wt.% starting material for spinel consisting of 70-80wt.% alumina and 30-20wt.% magnesia and contg. 5-25wt.% electromelted spinel having 0.05-2mm diameter, 1-10wt.% starting material for alumina-zirconia having 0.125-1.5mm diameter as an electromelted product consisting of 50-70wt.% alumina and 50-30wt.% zirconia and the balance alumina with a binder.

2. 发明专利

JPH06345549A CASTABLE REFRACTORY 失效
公开(公告)号：JPH06345549A
公开(公告)日：1994-12-20
申请号：JP16511593
申请日：1993-06-10
申请人： TOSHIBA CERAMICS CO , WAKI TAIKA KOGYO KK , SUMITOMO METAL IND
发明人： UEMOTO HIDEO , NAKAMURA NOBORU , YAMAZAKI KEISUKE , SUMITOMO KEISUKE , TANGE MASAKI , KIGUCHI HIROSHI , URA KOICHI , HIRAYAMA KIYOE
IPC分类号： B22D41/02 , C04B35/66 , F27D1/00
摘要： PURPOSE:To obtain a castable refractory excellent in slag permeability, thermal impact resistance and durability, etc., by mixing a specific composition of spinel raw material, alumina.zirconia raw material, alumina and a binder in a specific weight ratio. CONSTITUTION:(A) 10-40wt.% the spinel material, (B) 1-10wt.% the alumina.zirconia raw material and (C) the balance quantities of the alumina and the binder are mixed to produce the castable refractory. However, in the A component, electrofused spinel is essentially used for the product in the particle range from 0.05 to 2mm, and also an additional quantity of the electrofused spinel is >=50wt.% for the total spinel additional quantity. The B component also uses an electrofused product consisting of 50-80wt.% alumina and 50-20wt.% zirconia, and the particle range is from 0.125 to 1.5mm. A portion of the alumina in the C component is also composed of 2-5wt.% superfine powder containing >=50wt.% particles with

3. 发明专利

JPH06345546A CASTABLE REFRACTORY 失效
公开(公告)号：JPH06345546A
公开(公告)日：1994-12-20
申请号：JP16513593
申请日：1993-06-10
申请人： WAKI TAIKA KOGYO KK , TOSHIBA CERAMICS CO , SUMITOMO METAL IND
发明人： SUMITOMO KEISUKE , TANGE MASAKI , NAKAMURA NOBORU , UEMOTO HIDEO , YAMAZAKI KEISUKE , KIGUCHI HIROSHI , URA KOICHI , HIRAYAMA KIYOE
IPC分类号： C04B35/66
摘要： PURPOSE:To provide a castable refractory having a high durability since the corrosion resistance has excellently been enhanced. CONSTITUTION:This refractory consists of 5-89.9wt.% spinel raw material, 89.9-5wt.% alumina raw material, 3-10wt.% alumina cement, 2-10wt.% alumina superfine powder, and 0.1-0.5wt.% silica superfine powder. Thus, by using a specified quantity of the alumina superfine powder and a specified quantity of the silica superfine powder in combination, an addition quantity of water is decreased at the time of application to enhance fluidity of the castable product and also reduce the porosity and function as a joining material between the spinel raw material and the alumina raw material.

4. 发明专利

JPH06345550A CASTABLE REFRACTORY 失效
公开(公告)号：JPH06345550A
公开(公告)日：1994-12-20
申请号：JP16513493
申请日：1993-06-10
申请人： TOSHIBA CERAMICS CO , WAKI TAIKA KOGYO KK , SUMITOMO METAL IND
发明人： UEMOTO HIDEO , NAKAMURA NOBORU , YAMAZAKI KEISUKE , SUMITOMO KEISUKE , TANGE MASAKI , KIGUCHI HIROSHI , URA KOICHI , HIRAYAMA KIYOE
IPC分类号： C04B35/66 , C21C5/44 , F27D1/00
摘要： PURPOSE:To obtain a castable refractory excellent in slag infiltration resistance, thermal shock resistance, durability, etc., by mixing a specific composition of spinel raw material, magnesia, alumina and a binder in a specified weight ratio. CONSTITUTION:(A) 10-40wt.% of spinel raw material, (B) 5-20wt.% of magnesia and (C) the balance the alumina and the binder are mixed to produce the castable refractory. In the A component, electrofused spinel is essentially used in the particle range from 0.05 to 2mm and also an additional quantity of the electrofused spinel is >=50wt.% for the total spinel additional quantity. Also the particle diameter range of the magnesia is =50wt.% of particles diameter with

5. 发明专利

JPH06298571A CASTABLE REFRACTORY 失效
公开(公告)号：JPH06298571A
公开(公告)日：1994-10-25
申请号：JP34992091
申请日：1991-12-10
申请人： TOSHIBA CERAMICS CO , WAKE TAIKA KOGYO KK , SUMITOMO METAL IND
发明人： NAKAMURA NOBORU , UEMOTO HIDEO , YAMAZAKI KEISUKE , SUMITOMO KEISUKE , TANGE MASAKI , KIGUCHI HIROSHI , URA KOICHI , HIRAYAMA KIYOE
IPC分类号： C04B35/66
摘要： PURPOSE:To obtain a castable refractory having improved slag infiltration resistance and thermal shock resistance to prolong the durable life by compounding a specific spinel raw material with magnesia, alumina and a binder. CONSTITUTION:The objective castable refractory is composed of 10-40wt.% of a spinel raw material, 5-20wt.% of magnesia and the remaining part of alumina and a binder. In the spinel raw material, electromelted spinel is used as the fraction having particle diameter of 0.05-2mm and the amount of the electromelted spinel is 5-25wt.% based on the total spinel raw material. The electromelted spinel particle has dense texture and low crystal grain boundary content and contains low-melting minerals such as SiO2 and CaO in the crystal grain boundary in isolated state and, accordingly, there is no instrusion of slag into the crystal grain boundary. When the particle size of magnesia exceeds 5mm, large cracks are generated at the circumference of the magnesia particle. The binder is alumina cement, etc.

6. 发明专利

JPH10280030A REPAIRED SIDE WALL OF RH VACUUM DEGASSING FURNACE AND METHOD FOR REPAIRING RH VACUUM DEGASSING FURNACE 失效
公开(公告)号：JPH10280030A
公开(公告)日：1998-10-20
申请号：JP9974797
申请日：1997-04-01
申请人： TOSHIBA CERAMICS CO , SUMITOMO METAL IND
发明人： IMAI ISAO , KAI SETSUO , KIJIMA MASAHIKO , YAMAGATA TOSHIAKI , URA KOICHI
IPC分类号： C21C7/10 , F27D1/00 , F27D1/16
摘要： PROBLEM TO BE SOLVED: To simply repair the damaged side wall in an RH vacuum degassing furnace for molten steel in good working efficiency and to provided a repaired side wall having excellent durability. SOLUTION: In the lining repairing side wall in the RH vacuum degassing furnace, a refractory brick layer 30 is formed in the peripheral direction of the repairing zone and connected with the side wall 3 in the repaired zone through a gap filled with monolithic refractories 4, 4' and before reusing the furnace, the metal-made supporting body supports a refractory brick 31 and at the time of reusing, the metal-made supporting body is eroded and thereafter, the position contacting with the molten steel is formed with the brick 31. The lining repairing method of a lower vessel in the RH vacuum degassing furnace consists of (1) a detecting process for detecting the damage part in the furnace, (2) a bottom surface 1C repairing process for horizontally repairing the damage position of the furnace bottom part, (3) a refractory brick layer charging process for charging and setting the refractory brick layer 30 formed by closely setting to the outer peripheral surface of the metal-made cylindrical supporting body through the gap so as to be faced to be the side wall to be repaired and (4) a process for filling up the monolithic refractories 4, 4' into the gap formed in the refractory brick layer charging process.

7. 发明专利

JP2001049328A STUD AND LANCE PIPE 失效
公开(公告)号：JP2001049328A
公开(公告)日：2001-02-20
申请号：JP22651599
申请日：1999-08-10
申请人： TOKYO YOGYO KK , SUMITOMO METAL IND
发明人： SASAJIMA YASUSHI , KATO TERUO , URA KOICHI
IPC分类号： C22B9/05 , C21C1/02 , C21C5/46 , C21C7/072 , F27D1/14 , F27D1/16 , F27D3/16 , F27D3/18
摘要： PROBLEM TO BE SOLVED: To provide a stud wherein peeling off or falling off of coated layer on a castable refractory can effectively be prevented, and a lance pipe using the studs. SOLUTION: The stud is composed of one pair of arm parts extended in two directions from a fitted base part and return parts extended outward from these arm parts, respectively. The lance pipe is provided with a core metal 2, studs arranged on the outer surface of the core metal 2 and the coated layer 3 of the castable refractory covering the outer surface of the core metal. Two pieces of studs are disposed in radial state and with an equal interval with the axis of the core metal as the center on the transverse surface of the core metal. The studs arrangement is repeated in the longitudinal direction of the core metal for each unit composed of a perpendicular disposing type stud (1), where the V-shaped plane is perpendicular to the core metal axis, and a perpendicular disposing type stud (2) is disposed so as to shift by 90 deg. to the stud (1), a disposing stud (3) is disposed parallel to the core metal axis and a parallel disposing stud (4) is disposed so as to shift by 90 deg. to the stud (3).

8. 发明专利

JPS61217518A METHOD FOR PREVENTING NITROGEN ABSORPTION IN LADLE REFINING 失效
公开(公告)号：JPS61217518A
公开(公告)日：1986-09-27
申请号：JP6032585
申请日：1985-03-25
申请人： SUMITOMO METAL IND
发明人： WATANABE YOSHIO , URA KOICHI
IPC分类号： C21C7/00 , C21C7/072
摘要： PURPOSE:To easily prevent nitrogen absorption and execute ladle refining by refining the molten steel in a ladle by injection of powder and charging a carbon ic acid-contg. material to the surface of the molten steel to decompose thermally the material so that the surface of the molten steel is coated with the generated carbon dioxide. CONSTITUTION:The carbonic acid-contg. material such as limestone or dolomite is dividedly charged preferably little by little to the molten steel 2 contained in the ladle 1 via a chuter 4 and is thermally decomposed on the surface of the molten steel to generate gaseous CO2 in the stage of ladle refining consisting in subjecting the molten steel 2 to the injection of powder such as Ca alloy powder entrained in an inert gas via a lance 3 immersed into the molten steel from above and refining the molten steel. The above-mentioned gaseous CO2 expands the slag and forms a gaseous CO2 atmosphere in the idle 1 provided with a cap 6 thereby covering the surface of the molten steel 2. The nitrogen absorption from the air is thus prevented and the ladle refining of the extra-low S-, N steel is made possible.

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