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1. 发明专利

JPH06106310A NOZZLE FOR CASTING 失效
公开(公告)号：JPH06106310A
公开(公告)日：1994-04-19
申请号：JP26160292
申请日：1992-09-30
申请人： NIPPON STEEL CORP , KUROSAKI REFRACTORIES CO
发明人： HORI RYUICHI , MIHARA HIRONOBU , MIZUTA HIROAKI , MIWA MASUYUKI
IPC分类号： B22D11/10 , B22D11/16 , B22D41/50 , B22D41/58
摘要： PURPOSE:To reduce the developing rate of pin holes in a cast slab by providing at least one or mare of pressure measuring holes penetrating plural fine holes from the inner wall to the outer wall of a nozzle for casting in the measuring holes. CONSTITUTION:In packing material providing a base material 11 in an immersion nozzle and SUS-made socket metal tool 12 for connecting guiding pressure piping, the pressure measuring hole is arranged. As this material, coating material or heat resistant-mortar is used. A metal hoop 14 fixes the socket metal tool 12. Plural pieces of organic fibers 15 are arranged from the inner wall to the outer wall of the nozzle and eliminated at the time of preheating the immersion nozzle to become the fine pressure measuring holes. The material of a hot sealing material 16 is constituted of Al2O3, SiO2 and water glass. Therefore, by constituting the measuring hole with plural fine holes, the inner pressure in the nozzle can be measured in good precision and the always stable condition, and gas quantity mixed in the mold can be made to be the suitable quantity.

2. 发明专利

JPH0699257A INTERNAL GAS PRESSURE CONTROL METHOD FOR NOZZLE FOR CASTING 失效
公开(公告)号：JPH0699257A
公开(公告)日：1994-04-12
申请号：JP25003792
申请日：1992-09-18
申请人： NIPPON STEEL CORP
发明人： HORI RYUICHI , MIHARA HIRONOBU , MIZUTA HIROAKI , OMURA YASUMASA
IPC分类号： B22D11/10 , B22D11/16 , G01L7/00
摘要： PURPOSE:To reduce a pin hole generating rate of cast slab by using the internal gas pressure control method of a nozzle for casting as to continuous casting of steel. CONSTITUTION:When a variation quantity from the steady state value of the nozzle internal pressure inside an immersion nozzle 4 of a tundish for continuous casting exceeds the base value, by reducing an upper nozzle 1 Ar flow quantity, an apparent specific gravity of molten metal is raised, it makes the nozzle internal pressure return to the steady state value, or by increasing an upper nozzle Ar flow quantity, an apparent specific gravity of molten metal is reduced, thus, it executes the control to make the nozzle internal pressure return to the steady state value.

3. 发明专利

JPH0530543B2 失效
公开(公告)号：JPH0530543B2
公开(公告)日：1993-05-10
申请号：JP1505989
申请日：1989-01-26
申请人： NIPPON STEEL CORP
发明人： ISHII TAKEJI , FUKUNAGA SHINICHI , OOTA ITSUO , SHIROMIZU YOSHITAKA , NAKAHARA MINORU , MIZUTA HIROAKI
IPC分类号： B22D11/08 , B22D11/10

4. 发明专利

JPH02197355A METHOD FOR CONTINUOUSLY CASTING DIFFERENT STEEL KINDS 失效
公开(公告)号：JPH02197355A
公开(公告)日：1990-08-03
申请号：JP1505989
申请日：1989-01-26
申请人： NIPPON STEEL CORP
发明人： ISHII TAKEJI , FUKUNAGA SHINICHI , OTA ITSUO , SHIROMIZU YOSHITAKA , NAKAHARA MINORU , MIZUTA HIROAKI
IPC分类号： B22D11/08 , B22D11/10
摘要： PURPOSE:To enable sequential continuous casting operation for different steel kinds in the same tundish by automatically separating a connecting member for different steel kind sequential continuous casting composed of parting plate and connecting member from a fitting jig and pouring molten steel through the parting plate after dipping this into a mold. CONSTITUTION:The connecting member 10 for different kinds of steel sequential continuous casting integratedly connecting the V-shape molten steel parting plate 1 is diagonally evacuated at side part 15 above the mold through the fitting jig 11 arranged at bottom part 12 of the tundish under condition of existence of unsolidified molten steel in the mold 16. The upper part of the connecting member 10 is hung up with a hook 8 through the fitting jig 11, and at the time of rising the tundish 17, the connecting member 10 is hung up until this comes to perpendicular to the molten steel surface in the mold with gravity. After that, the tundish 17 is lowered and the connecting member 10 is dipped in the molten steel surface in the mold. At the time of returning the tundish 17 to the submerged casting position, the connecting member 10 is released from the hook 8 of the fitting jig 11 and the molten steel of the following heat is poured into the mold 16 and the molten steel having the different kinds of steel is continuously cast.

5. 发明专利

JPH0428462A IMMERSION NOZZLE FOR CONTINUOUS CASTING AND PRODUCTION THEREOF 失效
公开(公告)号：JPH0428462A
公开(公告)日：1992-01-31
申请号：JP13476190
申请日：1990-05-24
申请人： HARIMA CERAMIC CO LTD , NIPPON STEEL CORP
发明人： MARUKI YASUO , MIZUTA HIROAKI , YOKOYAMA YOICHI , NISHIKAWA MASAMI
IPC分类号： B22D11/10 , B22D41/54 , C04B35/48 , C04B35/52
摘要： PURPOSE:To obtain a stable operating state by forming the part of a nozzle brought into contact with molten steel with refractories based on ZrO2, CaO and C and having a specified active SiO2 content or below. CONSTITUTION:The amt. of active SiO2 taking part in a reaction in ZrO2.CaO material and the amt. of SiO2 including active SiO2 in the compsn. of brick are controlled so as to prevent the sticking of alumina during operation for a long time. The former active SiO2 is SiO2 taking part in a reaction with CaZrO2 in electromelted ZrO2.CaO material and is composed of SiO2 contained in electromelted ZrO2.CaO material and SiO2 added at the time of production. The part 1 of an immersion nozzle 10 brought into contact with molten steel is formed with ZrO2-CaO-C refractories having

6. 发明专利

JPH03138054A SUBMERGED NOZZLE FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH03138054A
公开(公告)日：1991-06-12
申请号：JP7826190
申请日：1990-03-26
申请人： HARIMA CERAMIC CO LTD , NIPPON STEEL CORP
发明人： MARUKI YASUO , MIZUTA HIROAKI , YOKOYAMA YOICHI , NISHIKAWA MASAMI
IPC分类号： B22D11/10 , C04B35/48
摘要： PURPOSE:To improve operational efficiency by constituting wall face of inner hole, wall face of discharging hole and outer wall face at lower side of the body up to powder line part with refractory raw material of composition containing the specific concns. of C, CaO, ZrO2, respectively. CONSTITUTION:The wall face of inner hole part A, wall face of discharging hole C and the outer wall face at lower side D of the body at least to the powder line part B are constituted with the refractory obtd. from the refractory raw material of composition containing 10-15wt.% C, 15-30% CaO and 35-65% ZrO2. By making the lower part side from this powder line of Zr-CaO-C quality refractory, stickness of non-metallic inclusion of alumina, etc., on contacting surface of the submerged nozzle 10 with molten steel is prevented. By this method, narrowing and clogging of the inner hole part of submerged nozzle can be avoided and continuous castings sequentially executing to many heats can be obtd. and the operational efficiency is improved. Further, phenomenon, which the stuck product is caught to the molten metal, is restrained and the deterioration of product quality can be prevented.

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