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1. 发明专利

JPS58176064A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPS58176064A
公开(公告)日：1983-10-15
申请号：JP5801882
申请日：1982-04-09
申请人： NIPPON KOKAN KK , NGK INSULATORS LTD
发明人： OOKUBO MASUTA , KAWAKAMI KIMINARI , HOSODA YOSHIROU , MIZUKAMI HIDEAKI , MURAKAMI KATSUHIKO , HIGUCHI NOBORU , MOCHIDA SHIGERU , OGASAWARA TAKAYUKI
IPC分类号： B22D11/10 , B22D11/11 , B22D11/112 , B22D11/116 , B22D11/117 , B22D11/119
摘要： PURPOSE:To adsorb and separate non-metallic inclusions efficiently by exchanging a tundish gate which has plural through-holes and adsorbs and separates the non-metallic inclusions in the through-holes during continuous casting. CONSTITUTION:Molten steel is charged from a ladle into a molten metal receiving bath 2a of a tundish 2 provided with gates 10, 10 having many through-holes 11, and is fed through the holes 11 of the gates 10 into static baths 2b, 2b. The non-metallic inclusions in the molten steel are adsorbed on the inside wall of the holes during the passage of the steel through the holes 11. The gate 10 is exchanged in the time (t) within the range determined by the equation during casting, whereby the inclusions are adsorbed and separated efficiently in the multiple casting as well without decreasing the adsorption and sepn. efficiency for the inclusions. If the gate 10 is not exchanged, the holes 11 are closed on progressing of the adsorption and sepn. of the inclusions on the inside wall of the holes 11, resulting in the decreased adsorption and sepn. efficiency for the inclusions.

2. 发明专利

JPS5868454A BOTTOM RUNNING INGOT MAKING METHOD FOR STEEL 失效
公开(公告)号：JPS5868454A
公开(公告)日：1983-04-23
申请号：JP16569481
申请日：1981-10-18
申请人： NIPPON KOKAN KK
发明人： OOKUBO MASUTA , KAWAKAMI KIMINARI , HOSODA YOSHIROU , MURAKAMI KATSUHIKO , MIZUKAMI HIDEAKI
IPC分类号： B22D7/00 , B22D7/06 , B22D35/04
摘要： PURPOSE:To prevent the degradation in the quality of steel ingots owing to the entry of nonmetallic inclusions in molten steel into the steel ingots in the stage of casting molten steel to the steel ingots by a bottom running ingot making method by using runner bricks provided with plural runner holes for a part or the whole of the runner bricks in a molding board. CONSTITUTION:In the stage of casting molten steel into molds 2 through the runner bricks in a molding board 5 from a charging pipe 1 by bottom running and producing steel ingots, runner bricks 3 having plural runner holes 7 are used as the runner bricks. Since the nonmetallic inclusions of large-sized oxidized matter such as molten slag, products of deoxidation, metallic oxides and the like contained in the molten steel are adsorbed and removed on and by the inside walls of the runner holes in the runner bricks, the quantity that such inclusions enter the inside of the molds 2 decreases as compared to that in the prior art, and the steel ingots of high quality contg. less metallic inclusions are obtained. As the number of the holes 7 is larger, the contents of the nonmetallic inclusions in the steel ingots are smaller, and the quality of the steel ingots is higher.

3. 发明专利

JPS57106413A LENGTHWISE CUTTING METHOD OF INGOT IN HOT STATE 失效
公开(公告)号：JPS57106413A
公开(公告)日：1982-07-02
申请号：JP18055780
申请日：1980-12-22
申请人： NIPPON KOKAN KK
发明人： HIRACHI MINORU , AOKI JIYOUJI , DAIKO KAORU , WAKASA HIROSHI , HOSODA YOSHIROU , WAKAMATSU IKUO
IPC分类号： B21B1/00 , B21B15/00 , B23D19/00
摘要： PURPOSE:To prevent an ingot from generating a camber after a cut of the ingot, by pressing vertical rolls against both side surfaces of an ingot, being cut lengthwise by a pair of upper and lower horizontal rolls having projections of V type sectional shapes on the outer peripheral surfaces of the rolls. CONSTITUTION:An ingot 7 conveyed by table rollers is guided by a front side guide 3 to intersect at right angles to the axial center line of horizontal rolls 1 to be bitten by the rolls 1. The distance delta between the peripheral tips of projections 2 of the rolls 1 is adjusted properly at every pass, e.g. the ingot 7 is cut lengthwise in hot state at the time of the 3rd pass. Though a camber of the ingot 7 is generated by this cut, the camber is corrected by pressing vertical rolls 4, being set at the intervals that enable the correction of the camber, against both the end surfaces of the ingot 7.

4. 发明专利

JPS59101272A Sealing method of upper nozzle hole of ladle 失效
标题翻译：上部喷嘴孔的密封方法
公开(公告)号：JPS59101272A
公开(公告)日：1984-06-11
申请号：JP21055282
申请日：1982-12-02
申请人： Nippon Kokan Kk
发明人： KAWAKAMI KIMINARI , HOSODA YOSHIROU , SASAJIMA YASUTOSHI , KOISHIKAWA HIROSHI
IPC分类号： B22D41/44 , B22D41/16 , B22D41/24 , B22D41/10
CPC分类号： B22D41/24 , B22D41/16
摘要： PURPOSE:To improve the opening rate of a nozzle hole and to prevent the contamination of a cast steel by sealing the upper part of the upper nozzle hole of a ladle with a stopper head, sealing the lower part thereof with a sliding type opening and closing device and filling no packing material in the nozzle hole. CONSTITUTION:The upper part of an upper nozzle 2 of a ladle is sealed with a stopper head 6, and a sliding nozzle 4 is mounted the lower part of the nozzle 2. The inside of the hole of the nozzle 2 is kept empty without packing material. The casting operation is accomplished by opening the nozzle 4 then pulling upward the head 6 to release the seal, then the molten metal is smoothly charged from the ladle into the casting mold. The packing and discharging operation occurring in the packing material, the manual operation for opening the hole, the oxidation of the molten metal and the contamination of the cast steel on account of incorporation of a silicate component, etc. therein are thus eluminated and the clean cast steel is obtd.
摘要翻译：目的：为了提高喷嘴孔的开口率，并通过用止动头密封钢包的上喷嘴孔的上部来防止铸钢的污染，用滑动式开闭密封其下部装置并在喷嘴孔中不填充包装材料。构成：钢包的上喷嘴2的上部用止动头6密封，滑动喷嘴4安装在喷嘴2的下部。喷嘴2的孔的内部保持空而不包装材料。铸造操作通过打开喷嘴4然后向上拉头6以释放密封来实现，然后熔融金属从浇包平稳地装入铸造模具中。因此，在包装材料中发生的包装和排放操作，用于打开孔的手动操作，熔融金属的氧化以及由于硅酸盐组分等的引入而导致的铸钢污染，因此被清除铸钢是公认的。

5. 发明专利

JPS5641317A COOLING METHOD FOR SLAB 失效
公开(公告)号：JPS5641317A
公开(公告)日：1981-04-18
申请号：JP11519879
申请日：1979-09-10
申请人： NIPPON KOKAN KK
发明人： KIKUCHI TOSHIAKI , YAMAMOTO MASAO , MORISHIMA AKINORI , HOSODA YOSHIROU
IPC分类号： C21D9/00
摘要： PURPOSE:To cool steel slab efficiently without causing strain in the slab in cooling the steel slab, by pouring water to the slab piled in a water tank to a level under the upper surface of the upper-most slab, and by immersing the slab into water completely after it is kept for a prescribed time. CONSTITUTION:Plural steel slabs 4 are piled on the laid floor 2 in a water tank 1. Then water is poured into the water tank 1 to a water level 3 3/8-5/8 the thickness (t) of the slab lower than the upper surface of the uppermost layer slab 4a. The slabs are kept at the state for 25-45min, so that a cooling zone 5 is formed around the slab 4a and its elasticity is increased because the water around the uppermost slab 4a boils and cools the circumference of the slab 4a. At that time, water is poured once again until it overflows thereby immersing the whole salb 4a in the water, however no cooling strain is formed because the uppermost slab 4a has high elastic limit.

6. 发明专利

JPS5356131A METHOD OF MAKING INGOT BY BOTTOM POURING 失效
公开(公告)号：JPS5356131A
公开(公告)日：1978-05-22
申请号：JP13122476
申请日：1976-11-02
申请人： NIPPON KOKAN KK
发明人： TAGUCHI KIYOMI , HOSODA YOSHIROU , SHIRATANI YUUSUKE , MATSUDA YASUHIRO , KOYANAGI DAIJIROU
IPC分类号： B22D7/00 , B22D7/06 , B22D37/00 , B22D41/26

7. 发明专利

JPS60218437A ARC MELTING METHOD 失效
公开(公告)号：JPS60218437A
公开(公告)日：1985-11-01
申请号：JP7514984
申请日：1984-04-16
申请人： NIPPON KOKAN KK
发明人： TANAKA SHIYUNICHI , NOMURA HIROICHI , TAMAKI MITSUZOU , YOSHIDA TAIZOU , OZEKI AKIYA , HOSODA YOSHIROU , KAWAKAMI KIMINARI , INAMOTO KINYA
IPC分类号： C22C1/02 , C22B9/20 , F27D11/08
摘要： PURPOSE:To control the crystal structure of an ingot and the alloying components by placing plural consumable electrodes horizontally or downward over a casting mold so that extension lines of the electrodes intersect each other and by generating arc between the electrodes and between the electrodes and the casting mold or the ingot to be remelted in vacuum or an inert atmosphere. CONSTITUTION:Two consumable electrodes 1, 2 are placed downward over a water-cooled steel casting mold 3 so that extension lines of the electrodes 1, 2 intersect each other. An ingot 4 in the mold 3 is melted in vacuum or an inert atmosphere by generating arc between the electrodes 1, 2 and between the electrodes 1, 2 and the ingot 4 or the mold 3. At this time, the temp. of a molten pool is controlled by regulating voltage and electric current.

8. 发明专利

JPS60174250A REMELTING METHOD OF METAL 失效
公开(公告)号：JPS60174250A
公开(公告)日：1985-09-07
申请号：JP2820384
申请日：1984-02-17
申请人： NIPPON KOKAN KK
发明人： TANAKA SHIYUNICHI , YOSHIDA TAIZOU , OZEKI AKIYA , HOSODA YOSHIROU
IPC分类号： B22D27/02 , B22D23/10 , B22D27/04
摘要： PURPOSE:To obtain an ingot having a defectless surface characteristic by placing a consumable casting mold consisting of the same metal as the metal of a consumable electrode or different metal in a water-cooled casting mold in tight contact with the inside circumferential surface thereof and remelting the same. CONSTITUTION:A cylindrical consumable casting mold 2 is installed in a water- cooled casting mold 1 in tight contact with the inside circumferential wall thereof. The mold 2 may be of the same metal as the metal of a consumable electrode X or different metal. When melting is executed in this state, the mold 2 is simply cooled indirectly and therefore even if a scab-like skull Y sticks on the inside surface of the mold 2, the skull Y and the inside surface side of the mold 2 are melted and united to one body upon rising of a molten pool. Since the outside surface side of the mold 2 is cooled in tight contact with the mold 1, said mold maintains the shape as it is and the ingot having the good outside surface characteristic is obtd.

9. 发明专利

JPS58176065A SEPARATION OF INCLUSION IN CONTINUOUS CASTING 失效
公开(公告)号：JPS58176065A
公开(公告)日：1983-10-15
申请号：JP5802182
申请日：1982-04-09
申请人： NIPPON KOKAN KK
发明人： OOKUBO MASUTA , KAWAKAMI KIMINARI , HOSODA YOSHIROU , MIZUKAMI HIDEAKI , MURAKAMI KATSUHIKO , KURIBAYASHI AKIO
IPC分类号： B22D11/10 , B22D11/11 , B22D11/112 , B22D11/116 , B22D11/117 , B22D11/119
摘要： PURPOSE:To maintain sepn. efficiency of the inclusions in molten steel at a specified level by adsorbing and separating the inclusions with a refractory filter which is provided between a tundish and a tundish nozzle and has plural through-holes and exchanging the filter properly. CONSTITUTION:A refractory filter 10 of high alumina base or the like is interposed between the bottom 2' of a tundish and a tundish nozzle 3. The inclusions in the molten steel fed from the bottom 2' to the nozzle 3 are adsorbed and separated by the plural through-holes 11 provided in the longitudinal direction of the filter 10. If the holes 11 of the filter 10 are clogged gradually and the adsorption efficiency of non-metallic inclusions is decreased on passing of the molten metal, the filter is exchanged at a suitable point of time. In other words, the filter 10 is formed into a continuous body assembled with individually divided many filters and the continuous body is slided so as to exchange the filter with the fresh filter.

10. 发明专利

JPS5887234A REFINING METHOD BY VACUUM MELTING 失效
公开(公告)号：JPS5887234A
公开(公告)日：1983-05-25
申请号：JP18444781
申请日：1981-11-19
申请人： NIPPON KOKAN KK
发明人： KAWAKAMI KIMINARI , KAWAI YOSHIHIKO , HOSODA YOSHIROU , SASAJIMA YASUTOSHI , YANO KOUZOU
IPC分类号： C21C7/10 , C22B9/04
摘要： PURPOSE:To obtain metal of high refining accuracy by adding heating in a vacuum induction melting furnace or slag refining wherein the flow passage of the molten metal maintained at a specified temp. is changed to a series of stages. CONSTITUTION:In the stage of performing a series of stages of heating, melting, refining, tapping and casting of metal by the use of a vacuum induction melting furnace, degassing of O, H, N, etc. from the inside of molten metal and decarburization are accelerated by vacuum refining after heating and melting. Thereafter a flux for removing impurities or for adsorption of inclusions is charged for the purpose of dephosphorization, desiliconization, etc. into a molten metal, whereby slag refining is accomplished. Here, the molten metal is heated or is held at a specified temp.; at the same time the induced agitating flow is changed to the flow that ascends over the entire area on the furnace wall 3 side and descends in the central part of the furnace. Thus the molten metal is agitated thoroughly and the flux 2 is accumulated in the recess 4 formed in the central part on the surface of the molten metal 1, whereby the contact thereof with the wall 3 is prevented and the slag refining is accomplished. After the removal of the slag, the molten metal is subjected to vacuum finish refining in the same furnace.

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