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1. 发明专利

JPH01180762A METHOD FOR CONTINUOUSLY CASTING ROUND CAST BILLET HAVING EXCELLENT QUALITY 失效
公开(公告)号：JPH01180762A
公开(公告)日：1989-07-18
申请号：JP32974187
申请日：1987-12-28
申请人： KAWASAKI STEEL CO
发明人： YAMAZAKI HISAO , SHINJO YUTAKA , SAITO KENJI , NOZAKI TSUTOMU , KUSHIDA KOICHI
IPC分类号： B22D11/10 , B22D11/115
摘要： PURPOSE:To produce a round cast billet having only a little center segregation and inclusion in the cast billet by using method for stirring molten steel in a mold to circular direction with electromagnetic stirring device and controlling index of the stirring force with the electromagnetic stirring to the specific value range of Gauss.Hz . CONSTITUTION:In the electromagnetic stirring device setting at the mold and just below the mold, the index of the stirring force with the electromagnetic stirring is controlled to 500-800Gauss.Hz . Condition of the electromagnetic stirring is decided by the reason that flowing speed of the molten steel caused by electromagnetic force is in proportion to the electromagnetic force, that is, the index of the electromagnetic stirring force. When the stirring intensity is low, the deterioration of the center segregation and the blow hole under the surface skin are developed and when the stirring intensity is too strong, the increase of the negative segregation and of the inclusion caused by enclosure of mold powder are brought about. In the case of the stirring intensity in the range as the abovementioned, the round cast billet having excellent quality can be produced. By this method, the round bar having only a little center segregation, inclusion in the billet and blow hole under the surface skin can be obtd.

2. 发明专利

JPH01162551A METHOD FOR CONTINUOUSLY CASTING ROUND SHAPE BILLET 失效
公开(公告)号：JPH01162551A
公开(公告)日：1989-06-27
申请号：JP32133787
申请日：1987-12-21
申请人： KAWASAKI STEEL CO
发明人： YAMAZAKI HISAO , SHINJO YUTAKA , SAITO KENJI , NOZAKI TSUTOMU
IPC分类号： B22D11/00 , B22D11/12 , B22D11/128
摘要： PURPOSE:To obtain a round-shape billet having only a little internal defect with continuous casting by solidifying molten steel in the hypo-peritectic range while pouring into polygonal mold and successively, executing rolling-reduction 1 under the specific condition with the rolling-reduction of arc-like metallic mold in the specific range of the solid phase ratio in axial center part in the cast billet. CONSTITUTION:The molten steel in the hypo-peritectic range of 0.10-0.18wt.% C is solidified while pouring in the polygonal mold 1 having more than square shape, and the rolling reduction is continuously executed with the arc-like metallic mold 3, to reduce center segregation and center porosity while forming into the round cross section. In this case, the rolling reduction is executed to the polygonal cast billet running out from the mold 1 in the range of 0.5-0.9 the solid phase ratio fs in the axial center part of the cast billet with the rollingreduction device arranging the arc-like metallic mold 3 at >=0.6 of the rolling reduction rate mm/non-solidified rate mm, to make the round-shape billet. Burr developed after rolling reduction is removed with a burner 5.

3. 发明专利

JPS63154257A CASTING METHOD FOR UNIDIRECTIONALLY SOLIDIFIED STEEL INGOT 失效
公开(公告)号：JPS63154257A
公开(公告)日：1988-06-27
申请号：JP30001686
申请日：1986-12-18
申请人： KAWASAKI STEEL CO
发明人： MABUCHI MASAKI , SHINJO YUTAKA , OGUCHI MASAO
IPC分类号： B22D7/00 , B22D27/04
摘要： PURPOSE:To prevent metal penetration and damage of short side wall refractories by the metal penetration at the time of casting a unidirectionally solidified steel ingot by sealing the spacings between the side walls, molding board and short side walls, then executing casting. CONSTITUTION:A frame 2 made of a U-shaped steel sheet is supplied into the spacing between the side walls 4 and the molding board 5 and the short side walls in synchronization with the cyclically moving side walls 4 and molding board 5 across the side walls 4 and the cooled molding board 5 at the time of sealing the spacings between the side wall 4 and the molding board 5 and the short side walls. A molten metal is cooled and solidified before the molten metal penetrates into the spacings between the side walls 4 and the molding board 5 and the side walls. The steel sheet is formed to such a thickness at which the latent heat as much as the cooling and solidifying of the molten metal is absorbed before the penetration of the molten metal.

4. 发明专利

JPS62166052A CASTING MOLD FOR INGOT MAKING 失效
公开(公告)号：JPS62166052A
公开(公告)日：1987-07-22
申请号：JP611286
申请日：1986-01-14
申请人： KAWASAKI STEEL CO
发明人： KOJIMA SHINJI , MATSUKAWA TOSHITANE , TACHIBANA RINZO , SHINJO YUTAKA , KORIYAMA TAKESHI
IPC分类号： B22D7/06
摘要： PURPOSE:To decrease the reverse V segregation, top segregation, hole type defects, etc. of a thin-walled steel ingot and to improve the yield thereof by forming a casting mold for a specified weight or about of the flat steel ingot into a specifically sized shape which is large in the wall thickness of the lower part and has a specified rate or below of an upwardly expanding taper. CONSTITUTION:The sized and shape of the casting mold for >=30t flat steel ingot are specified to the specific relations expressed by the equation I- equation IV, where M: the own weight of the casting mold, I: the own weight of the steel ingot, H: the height of the casting mold, D: the average thickness of the steel ingot, W: the average width of the steel ingot, D1: the distance between the top ends on the long side surfaces of the casting mold, D2: the distance between the top and bottom end thereof, d1: the wall thickness at the top end on the long side surface of the casting mold, d2: the wall thickness at the bottom end of said top surface. The steel ingot is made thin film if the casting mold is formed to such size relations. The wall thickness of the casting mold is made thinner toward the lower part and the upwardly expanding taper quantity is kept at

5. 发明专利

JPS61165259A SEALING METHOD FOR CUT END FACE OF STEEL INGOT 失效
公开(公告)号：JPS61165259A
公开(公告)日：1986-07-25
申请号：JP659585
申请日：1985-01-17
申请人： KAWASAKI STEEL CO
发明人： MATSUKAWA TOSHITANE , TAKASHIBA NOBUMOTO , SHINJO YUTAKA
IPC分类号： B22D11/12 , B22D11/126
摘要： PURPOSE:To seal the hole at the center of the high-temp. cut face of a steel ingot and to prevent the oxidation thereof by cooling forcibly at least the part near the center of the cut face then heating said face to double-melt the face. CONSTITUTION:A bloom 1 which is conveyed after cutting by a torch is stopped in a prescribed position and the end face of the bloom 1 is spray-cooled by a spray nozzle 3. The part near the center of the end face is then double-melted by a burner 6 ignited by an automatic ignition device 5. The generation of center porosity is thus prevented without the generation of exfoliation and flow down and the part near the center is surely sealed. The deterioration of the product quality is thereby prevented.

6. 发明专利

JPH01180749A INGOT MAKING METHOD FOR HIGH CR-MO STEEL 失效
公开(公告)号：JPH01180749A
公开(公告)日：1989-07-18
申请号：JP32953987
申请日：1987-12-28
申请人： KAWASAKI STEEL CO
发明人： SHINJO YUTAKA , SAITO KENJI , NOZAKI TSUTOMU
IPC分类号： B22D7/00
摘要： PURPOSE:To reduce the development of porous defect in an ingot by immediately adding electric conductive flux on upper surface of molten steel after casting the molten Cr-Mo steel having high Cr content into a horizontal rotating mold and electric-conducting and heating the top part of the ingot. CONSTITUTION:The mold 3 is set on a rotating base plate 4 and the molten high Cr-Mo steel containing 5-13wt.% Cr is cast into the mold 3 and just after that, the flux 2 is charged on the molten steel pool 5 and the electricity is conducted and heated with a graphite electrode 1. Then, at the initial stage of electric-conducting for heating, in order to prevent surface solidified skin of the molten steel, the charging power is regulated to the prescribed quantity, and after the initial stage, the charging power is increased by a little. Further, dipping depth of the electrode 1 into slag is increased to the suitable quantity, to increase molten steel supply into developing part of porous defect. By this method, dendritic structure in the molten steel is made to fine and also the development of the porous defect in the high Cr-Mo steel ingot is reduced.

7. 发明专利

JPH01127625A METHOD FOR ADDING ALLOY IN ELECTROSLAG REMELTING 失效
公开(公告)号：JPH01127625A
公开(公告)日：1989-05-19
申请号：JP28518687
申请日：1987-11-13
申请人： KAWASAKI STEEL CO
发明人： NABESHIMA SEIJI , SHINJO YUTAKA , SAITO KENJI , NOZAKI TSUTOMU
IPC分类号： C22C33/04 , C22B9/18
摘要： PURPOSE:To uniformly add an additive to steel in a high yield without exerting unfavorable influence on the surface quality by using a hollow electrode, putting a wiry or cylindrical alloy having a desired compsn. as the additive in the hollow part and carrying out remelting. CONSTITUTION:A hollow electrode is used at the time of electroslag remelting. A wiry or cylindrical alloy having a desired compsn. as an additive is integrated with the electrode by putting in the hollow part and operation is carried out. The alloy components are continuously added to steel and the deterioration of the surface quality and segregation in the surface layer due to the flowing of slag and a change of the temp. can be prevented. The amt. of the additive added is regulated by changing the diameter or compsn.

8. 发明专利

JPS6313659A MANUFACTURE OF STEEL INGOT 失效
公开(公告)号：JPS6313659A
公开(公告)日：1988-01-20
申请号：JP15512386
申请日：1986-07-03
申请人： KAWASAKI STEEL CO
发明人： SAITO KENJI , SHINJO YUTAKA , KINOSHITA KATSUO , OGUCHI MASAO , OZU SHUJI
IPC分类号： B22D27/06 , B22D23/10 , B22D27/02
摘要： PURPOSE:To prevent the erosion of a feeding head sleeve brick and to prevent the penetration of the molten steel of the feeding head part into the gap caused between a mold and steel ingot by arranging the sleeve protection ring dipping its lower part into a melted slug at the inner side of the feeding head sleeve brick. CONSTITUTION:After pouring a molten steel 7 a molten slug 8 is added thereon, the lower end part of an electrode 6 is dipped into the slug 8 and with its electrification the slug 8 is heated and subjected to a heat insulation. The molten slug located on the molten steel is easily penetrated into the gap of the sleeve brick 4 and ring 5. The slug located in the gap of the sleeve brick 4 and ring 5 is cooled by the both parts of the brick 4 and ring 5 besides having no flow, reaching to be solidified. The slug 8 coming into contact with the ring 5 is cooled to form the protection layer of the ring 5. The molten steel coming into contact with the brick 4 forms as well as solidified shell on the feeding head part. In this way, it is easily solidified even at the time when the molten steel is flowed into the gap of the slug and solidified shell at the solidification contraction time of the steel ingot and the flow of the molten steel into the gap of the mold and steel ingot is prevented.

9. 发明专利

JPS626768A PRODUCTION OF UNIDIRECTIONALLY SOLIDIFIED STEEL INGOT 失效
公开(公告)号：JPS626768A
公开(公告)日：1987-01-13
申请号：JP14394385
申请日：1985-07-02
申请人： KAWASAKI STEEL CO
发明人： SHINJO YUTAKA , NAKANISHI KYOJI , KINOSHITA KATSUO , YAMAZAKI HISAO
IPC分类号： B22D7/00 , B22D27/18
摘要： PURPOSE:To easily remove a sintered slag layer to be formed on the head of a steel ingot by spraying a mixture composed of >=2 kinds of compds. of alkaline (earth) metals having low m.p. on the surface of a molten steel in the stage of ingot making thereby coating the surface of the molten steel. CONSTITUTION:A surface coating material is added to the surface of the molten steel to prevent the oxidation thereof in the initial period of pouring of the molten steel or during the pouring. The mixture composed of >=2 kinds of the alkali metal compds. or alkaline earth metal compds. having 800-1,400 deg.C m.p. is used as the surface coating material and is sprayed onto the surface of the molten steel. BaCl2, NaCl, BaCO3, Na2CO3, CaSi, etc. are selected as the above-mentioned compd. The sintered slag layer in the head part of the unidirectionally solidified steel ingot made by the above-mentioned manner has the weak adhesive power to the steel ingot and can be thoroughly removed by shot blasting and slight scarfing. The yield of the steel ingot body is thus improved.

10. 发明专利

JPS5943964B2 JPS5943964B2 - 失效
公开(公告)号：JPS5943964B2
公开(公告)日：1984-10-25
申请号：JP1887179
申请日：1979-02-20
申请人： Kawasaki Steel Co
发明人： OKANO SHINOBU , SHINJO YUTAKA , MATSUNO JUNICHI , FUNAKOSHI TOKUMI , TAKITANI KEIICHIRO , EJIMA AKIO
IPC分类号： C22C33/04 , B22D11/00 , B22D11/04 , C21C7/00 , C22C38/00 , C22C38/04

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