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1. 发明专利

JPH0413470A METHOD FOR PREVENTING SURFACE CRACKING OF SLAB 失效
公开(公告)号：JPH0413470A
公开(公告)日：1992-01-17
申请号：JP11818290
申请日：1990-05-07
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： TAKESHITA SHIGEYUKI , SHINTANI HIROTAKA , KAWAKAMI TATSUO
IPC分类号： B22D11/10 , B22D41/50
摘要： PURPOSE:To decrease the heat extraction quantity of a molten steel and to prevent the generation of the surface longitudinal cracking of a slab by providing a hollow part for heat insulation around the molten steel flow hole of an immersion nozzle from the upper part of the immersion nozzle body to the lower part and pouring the melt of a middle-carbon steel contg. carbon at a specific ratio through the immersion nozzle at a high velocity to a casting mold for molding the slab. CONSTITUTION:The immersion nozzle 1 for continuous casting is provided with the hollow part 6 for heat insulation concentrically with the molten steel flow hole 4 from the upper part of the straight cylinder-shape immersion nozzle body 3 to the lower part. The slab is continuously cast by passing the melt of the middle-carbon steel contg. 0.09 to 0.15wt.% carbon through the immersion nozzle 1 at the high velocity. The heat extraction quantity of the molten steel from the immersion nozzle is prevented, by which the temp. drop is hindered and the generation of the surface longitudinal cracking of the slab is surely prevented. The slab of the middle-carbon steel having good quality is thus cast with high productivity.

2. 发明专利

JPH0345560A NON-OXIDIZABLE SILICON CARBIDE-BASED REFRACTORY MATERIAL 失效
公开(公告)号：JPH0345560A
公开(公告)日：1991-02-27
申请号：JP17845689
申请日：1989-07-11
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： SAKAGUCHI MASAYUKI , TAKESHITA SHIGEYUKI , SHINTANI HIROTAKA , KAWAKAMI TATSUO
IPC分类号： C04B35/565 , C04B35/56
摘要： PURPOSE:To prevent generation of crack owing to deterioration of hot strength or hot spalling by adding silicon nitride-based raw material and alumina-based raw material to silicon carbide-based raw material, molding and burning in oxidative atmosphere. CONSTITUTION:Respective raw materials of (A) 60-90 pts.wt. silicon carbide- based raw material (containing amount of SiC: >=90wt.%), (B) 5-20 pts.wt. silicon nitride-based raw material (containing amount of Si3N4: >=90wt.%) and (C) 5-20 pts.wt. alumina-based raw material (containing amount of Al2O3: >=90wt.%) are subjected to granular size-adjusting and mixed, then binder such as dextrin or pulp waste solution is added, thus kneaded to form in brick-shape. Said shaped material is dried and burnt at a temperature of 1000-1500 deg.C in oxidative atmosphere to afford the aimed refractory material used for burning of ceramic or reduction of iron oxide, etc.

3. 发明专利

JPH02160666A GRAPHITE-SILICON CARBIDE BRICK FOR BLAST FURNACE 失效
公开(公告)号：JPH02160666A
公开(公告)日：1990-06-20
申请号：JP31480188
申请日：1988-12-12
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： SAKAGUCHI MASAYUKI , TAKESHITA SHIGEYUKI , SATO TSUTOMU , SHINTANI HIROTAKA , KAWAKAMI TATSUO
IPC分类号： C04B35/565 , C04B35/52 , C04B35/573
摘要： PURPOSE:To obtain the title brick of both high SiC content and thermal conductivity with excellent heat spalling resistance by adding a phenol-based resin to a mixture of graphite, SiC, Si and specific metal silicide at specified proportion followed by press forming and reductive baking. CONSTITUTION:A blend of (A) 40-70 pts.wt. of flaky graphite, (B) 30-50 pts.wt. of SiC, (C) 4-10 pts.wt. of metallic Si, and (D) 0.2-5 pts.wt. of at least one kind of compound selected from CrSi2, TiSi2, ZrSi2, MoSi2, WSi2, TaSi2, and NbSi2, is admixed with 8-15 pts.wt. of a phenol-based resin binder followed by fluidized drying to regulate volatile content. The resultant raw powder is then put to press forming and reductive baking to obtain the objective brick. The metallic Si and metal silicide in this brick have sufficiently reacted with the carbon therein to form SiC, thus manifesting sufficiently high mechanical strength.

4. 发明专利

JPH01122643A SUBMERGED NOZZLE FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH01122643A
公开(公告)日：1989-05-15
申请号：JP28149787
申请日：1987-11-06
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： WATANABE NOBUTAKA , TAKESHITA SHIGEYUKI , OGUCHI MASAO
IPC分类号： B22D11/10 , B22D41/50
摘要： PURPOSE:To form a compound having low melting point with precipitated alumina in molten steel and to prevent clogging of submerged nozzle with alumina by arranging a bottom part made of a CaO refractory in the submerged nozzle for a tundish in continuous casting apparatus. CONSTITUTION:At the time of pouring the molten steel in the tundish into a mold for continuous casting through the submerged nozzle 1 in the continuous casting apparatus for the molten steel, Al2O3 existing as dispersing in the molten steel in the case of aluminum killed steel, etc., is precipitated from the molten steel, and molten steel flowing hole 2 in the submerged nozzle 1 is clogged and the molten steel from the tundish comes to be impossible to pour into the mold for continuous casting and the continuous casting operation is interrupted. In this case, a well 4 is arranged below molten steel discharging holes 3 at lower part of the submerged nozzle 1 and the bottom member 5 composing of the refractory containing CaO as the main component and SiO2, etc., is set in the well 4. As the Al2O3 precipitated from the molten steel forms the compound having low melting point together with CaO and SiO2 and flows out from the nozzle 1, the interruption of the continuous casting operation caused by deposit and clogging of Al2O3 in the flowing hole 2 of the nozzle 1 is prevented.

5. 发明专利

JPH1157957A SLIDING NOZZLE PLATE AND ITS MANUFACTURE 失效
公开(公告)号：JPH1157957A
公开(公告)日：1999-03-02
申请号：JP23905497
申请日：1997-08-19
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： TAKESHITA SHIGEYUKI , SASAKI KIMIAKI , OKAMOTO TAKESHI , TANAKA SEIJIRO
IPC分类号： B22D41/32 , B22D11/10 , C04B35/103
摘要： PROBLEM TO BE SOLVED: To improve the thermal-shock resistance and corrsion resistance even when a sliding nozzle for controlling flow-rate of molten metal is repeatedly subjected to severe thermal shock between high temp. heating and cooling. SOLUTION: This is in alumina-carbon sliding nozzle plate for controlling the flow rate of the molten metal and in the alumina-carbon the main mineral phase of which is corundum and monoclinic system zirconia, electromelted alumina-zirconia material consisting of coarse particle, medium particle and fine particle having a chemical composition of 75-80 wt.% alumina and 20-25 wt.% zirconia is contained by 5-50 wt.%. The thermal shock resistance and corrosion resistance are improved by containing the fine powder of particle size of 200-10 μm by 5-20 wt.% in the electromelted alumina-zirconia material having the particle size of 4 mm-10 μm.

6. 发明专利

JPH10258351A SLIDING NOZZLE PLATE FOR POURING MOLTEN METAL 失效
公开(公告)号：JPH10258351A
公开(公告)日：1998-09-29
申请号：JP6499497
申请日：1997-03-18
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： KOSHIKAWA TAKAO , TAKESHITA SHIGEYUKI , MUROI MASANORI
IPC分类号： B22D41/32 , B22D11/10
摘要： PROBLEM TO BE SOLVED: To provide a refractory-made sliding nozzle plate used as a flow rate adjusting valve for pouring molten metal. SOLUTION: This nozzle plate is constituted with the same composition refractory to a sliding surface layer 11 and the inner peripheral surface part 12 of a molten metal discharging hole 6, and non-sliding surface layer 10 is constituted with the different composition of the refractory material to the above refractory material. As the other way, the sliding surface layer 11, the inner peripheral surface part of the molten metal discharging hole 6 and the non-sliding surface layer 10 are constituted with each different composition of the refractory material. By this constitution, this nozzle plate has excellent erosion resistance and spalling resistance and can be manufactured in a very low cost. Further, the detachment between the layers and the thermal deformation can be prevented by making the refractory materials constituting the sliding surface layer 11, the inner peripheral surface part 12 of the molten metal discharging hole 6 and the non-sliding surface layer 10 with the materials having almost equal coefficient of thermal expansion, can be prevented.

7. 发明专利

JPH07277858A ANTIOXIDANT FOR CARBON-CONTAINING REFRACTORY 失效
公开(公告)号：JPH07277858A
公开(公告)日：1995-10-24
申请号：JP8735494
申请日：1994-03-31
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： TAKESHITA SHIGEYUKI , HIROTA TETSUO , TANAKA SEIJIRO , MABUNE TAKUZOU
IPC分类号： C04B41/86 , C04B41/48 , C04B41/50 , C04B35/52
摘要： PURPOSE:To improve the durability of carbon-contg. refractories for an immersion nozzle for continuous casting, a long nozzle, etc. CONSTITUTION:This antioxidant sticks to the surfaces of carbon-contg. refractories and prevents the oxidation of the carbon-contg. refractories in a hot state. This antioxidant is blended with low m.p. frit powder and 5-40wt.% silica powder based on the amt. of the antioxidant and the surfaces of carbon-contg. refractories are uniformly coated with vitreous layers made of the resultant blend so as to produce an oxidation preventing effect over the temp. region from a low temp. to a high temp.

8. 发明专利

JPH03243259A SUBMERGED NOZZLE FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH03243259A
公开(公告)日：1991-10-30
申请号：JP3993090
申请日：1990-02-21
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： TAKESHITA SHIGEYUKI , HASEGAWA SUSUMU , SHINTANI HIROTAKA , KAWAKAMI TATSUO , DAIMON MASAYA , HIGASHIHARA TAKESHI
IPC分类号： B22D11/10 , B22D41/54 , C04B35/10 , C04B35/103 , C04B35/48
摘要： PURPOSE:To obtain a submerged nozzle, in which each different characteristic demanded to each position is satisfied and the durability is excellent, by specifying compositions of base end part, powder line part and tip part in the submerged nozzle for continuous casting. CONSTITUTION:In the submerged nozzle for continuous casting, the base end part 1 is the material constituted of

9. 发明专利

JPH0289546A NOZZLE FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH0289546A
公开(公告)日：1990-03-29
申请号：JP24058688
申请日：1988-09-26
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： TAKESHITA SHIGEYUKI , SHINTANI HIROTAKA , KAWAKAMI TATSUO
IPC分类号： B22D11/10 , B22D41/50 , C04B35/103 , C04B35/48
摘要： PURPOSE:To restrain fining-down and flowing-out of zirconia grain and to give high erosion resistance by using the specific zirconia-graphite quality material to the part contacting with mold powder in an alumina-graphite quality submerged nozzle. CONSTITUTION:In the alumina-graphite quality submerged nozzle using to steel continuous casting, the zirconia-graphite quality material containing 50-90wt.% zirconia and 10-40% graphite is used to the part contacting with the mold powder. The zirconia material mixed at 60/40-90/10 ratio of non-stabilized zirconia and lime-stabilized zirconia is used. By using the nozzle for continuous casting, the erosion resistance at powder-line is improved and continuous casting is stably executed.

10. 发明专利

JPH01289549A NOZZLE FOR CONTINUOUS CASTING OF STEEL 失效
公开(公告)号：JPH01289549A
公开(公告)日：1989-11-21
申请号：JP11887288
申请日：1988-05-16
申请人： KAWASAKI REFRACTORIES CO LTD
发明人： TAKESHITA SHIGEYUKI , DAIMON MASAYA , HASEGAWA SUSUMU , SHINTANI HIROTAKA , KAWAKAMI TATSUO
IPC分类号： B22D11/10 , B22D41/54
摘要： PURPOSE:To prevent nozzle clogging and to improve product quality by forming a lining layer contg. respectively specific weight % of CaO, MgO and C into the inside hole of the nozzle for continuous casting. CONSTITUTION:The lining layer 30 is formed of the compsn. contg., by weight, 40-90% CaO, 0-50% MgO and 0-20% C on the inside hole of the nozzle 10. The CaO component in the lining layer 30 adsorbs alumina (Al2O3) which is a deoxidized product and forms the reactant of the CaO-Al2O3 system when said product is adsorbed thereon. This reactant is lowered in m.p. and viscosity and is discharged away. Further, the MgO component intensifies the strength of the lining compsn. and a proper ratio of the C component lowers the wettability of the lining layer 30 with the molten steel. the respective components of the CaO, MgO and C, therefore, prevent the nozzle clogging by the deposits in the nozzle 10; in addition, the quality of the product is improved by casting of the clean steel.

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