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1. 发明专利

JP2002176877A BLOCK TO BE INSTALLED UNDER WATER 失效
公开(公告)号：JP2002176877A
公开(公告)日：2002-06-25
申请号：JP2000380677
申请日：2000-12-14
申请人： NIPPON KOKAN KK
发明人： NUMATA TETSUSHI , TAKAHASHI TATSUTO , SATO YOSHIO , SAKAI HIDENORI
IPC分类号： A01K61/00 , A01G33/00 , C04B7/14 , C04B18/14
摘要： PROBLEM TO BE SOLVED: To provide a block material to be installed under the sea water that can be constructed over a wide area of the sea that has been already attacked or has the anxiety of being attacked with rocky-shore denudation or the red tide and can manifest the effective preventive effect against rocky-shore denudation or red tide. SOLUTION: Granulated blast furnace slag obtained as a by-product in the steel production process has been found to be material having the extremely excellent leachability of silicate ion into water and the objective block material to be installed under the sea water characteristically includes the blast furnace granulated slag in an amount of >=50 mass %. This block material preferably includes fine particles o the granulated slag and/or a silica-including substance of >=40 mass % of SiO2 content and the total proportion of the slag particles and/or the silica-including substance is set to >=80 mass % in the whole binder materials. Particularly, the aggregate is constituted only with the blast furnace granulated slag and >=80 mass % of the binder is constituted with the granulated slag in a preferred embodiment.

2. 发明专利

JPH10314897A MOLD POWDER FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JPH10314897A
公开(公告)日：1998-12-02
申请号：JP14465297
申请日：1997-05-19
申请人： NIPPON KOKAN KK , KOKAN MINING CO LTD , SHINAGAWA REFRACTORIES CO
发明人： NAKAJIMA HIROHISA , KONDO HIROKAZU , MIYAMOTO AKIRA , WATANABE KEIJI , SAKAI HIDENORI , IZUMI HIROSHI , MORITA AKIHIRO , FUJIWARA HIDEAKI
IPC分类号： B22D11/07 , B22D11/108
摘要： PROBLEM TO BE SOLVED: To prevent the crack on the surface of a cast slab in a continuous casting for a steel, particularly a medium carbon steel. SOLUTION: Mold powder used for the continuous casting, has a basicity (CaO wt.%/SiO2 wt.%) in the range of 1.1-2.4 and contains 2-8 wt.% fluorine and 1-7 wt.% Al2 O3 . Further, the content of premelt flux in this mold powder satisfies the following inequality. (premelt flux wt.%)>=25×(CaO wt.%/SiO2 wt.%)+35. The above basicity is further desirable to be 1.3-1.6. Further, to the premelt flux, 4-25 wt.% one or more kinds of cryolite, NaF, fluorite, soda ash and Li2 O and 1-8 wt.% carbonaceous material can further be added.

3. 发明专利

JPH08267204A MOLD POWDER FOR CONTINUOUSLY CASTING MEDIUM CARBON STEEL CAST SLAB AND METHOD FOR CONTINUOUSLY CASTING MEDIUM CARBON STEEL CAST SLAB 失效
公开(公告)号：JPH08267204A
公开(公告)日：1996-10-15
申请号：JP9810195
申请日：1995-03-30
申请人： NIPPON KOKAN KK , KOKAN MINING CO LTD
发明人： OKAMOTO HIROMI , WATANABE KEIJI , KONDO HIROKAZU , MIYAMOTO AKIRA , SAKAI HIDENORI , SHIMIZU MASAAKI , NAKAYAMA NOBUTAKA
IPC分类号： B22D11/00 , B22D11/10 , B22D11/108 , B22D11/111 , B22D11/16
摘要： PURPOSE: To provide mold powder for continuous casting which prevents the development of the longitudinal crack on a cast slab caused by the development of uneven solidified shell in a mold, and to provide a method for continuously casting medium carbon steel cast slab. CONSTITUTION: This mold powder for continuous casting has a compsn. containing essentially CaO and SiO2 in a ratio CaO/SiO2 (by wt.%) of 1.2-1.6 and 2-6wt.% in total of MgO+LiO2 . The molten powder is cooled at least to =50% evaluated crystallizing ratio.

4. 发明专利

JPH10216907A MOLD POWDER FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH10216907A
公开(公告)日：1998-08-18
申请号：JP3150797
申请日：1997-01-31
申请人： NIPPON KOKAN KK , KOKAN MINING CO LTD
发明人： WATANABE KEIJI , SUZUKI MAKOTO , NAKADA MASAYUKI , SAKAI HIDENORI , SHIOMI TAKEYASU
IPC分类号： B22D11/00 , B22D11/07 , B22D11/10 , B22D11/108 , B22D11/111
摘要： PROBLEM TO BE SOLVED: To prevent the longitudinal crack in a continuously cast slab by specifying the range of basicity in powder, containing plural oxides of elements belonging to IA group and F in the specific ranges to precipitate crystal phase different to cuspidine so as to enable slow cooling in a mold. SOLUTION: The mold powder for continuous casting, having 1.6-2.5 in the range of basicity (CaO/SiO2 ) and containing two or more kinds of oxides of the elements belonging to the IA group in the periodic table in the range of 0.13

5. 发明专利

JPH09164460A POWDERY PRE-MELT FLUX FOR CONTINUOUS CASTING OF STEEL 失效
公开(公告)号：JPH09164460A
公开(公告)日：1997-06-24
申请号：JP34705595
申请日：1995-12-15
申请人： NIPPON KOKAN KK , KOKAN MINING CO LTD
发明人： YANASE YOSHIHIRO , SAGA JUNICHI , KAWASHIMA TAKESHI , SAKAI HIDENORI , SHIMIZU MASAAKI
IPC分类号： B22D11/10 , B22D11/108
摘要： PROBLEM TO BE SOLVED: To prevent the slab surface from being cracked by specifying the composition of the pre-melt flux, and specifying the flux to be amorphous. SOLUTION: The powdery pre-melt flux for continuous casting contains, by weight, 40-60% CaO, 30-40% SiO2 , 1-7% Al2 O3 ,

6. 发明专利

JPH08141713A MOLDING POWDER FOR CONTINUOUS CASTING OF STEEL 失效
公开(公告)号：JPH08141713A
公开(公告)日：1996-06-04
申请号：JP30168694
申请日：1994-11-11
申请人： NIPPON KOKAN KK , KOKAN MINING CO LTD
发明人： KAWANAMI SHUNICHI , TOYODA KOJI , MORI TAKASHI , KONDO HIROKAZU , NISHIMACHI RIYUUZOU , WATANABE KEIJI , MIYAMOTO AKIRA , SAKAI HIDENORI , SHIMIZU MASAAKI , IZUMI HIROSHI , KAWASHIMA TAKESHI
IPC分类号： B22D27/18 , B22D11/00 , B22D11/07 , B22D11/10 , B22D11/108 , B22D11/111
摘要： PURPOSE: To enable continuous casting of steel having excellent quality by specifying CaO/SiO2 and and specifying content of MgO. CONSTITUTION: The essential components of this powder for continuous casting of steel are composed of CaO and SiO2 . The CaO/SiO2 (wt.% basicity) is specified to 1.2 to 1.6 and the content of the MgO to 1.5wt.%. The content of any >=1 kinds among quartz crystal stone, NaF, fluorite, soda ashes and Li2 O is specified to 4 to 25wt.% and the content of any >=1 kinds among carbon black, flaky graphite to 1 to 8wt.%. The balance is composed of the CaO and the SiO2 and the CaO/SiO2 (wt.% basicity) to 1.2 to 1.6. As a result, the molding powder for continuous casting having the high rate of crystallization is obtd. within a range where meltability is not hindered.

7. 发明专利

JPH07323354A MOLDING POWDER FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH07323354A
公开(公告)日：1995-12-12
申请号：JP14085894
申请日：1994-05-31
申请人： NIPPON KOKAN KK , KOKAN MINING CO LTD
发明人： SUGIYAMA SHINICHI , MORI TAKASHI , TOYODA KOJI , UCHINO KAORU , SAKAI HIDENORI , SHIMIZU MASAAKI , IZUMI HIROSHI
IPC分类号： B22D11/10 , B22D11/108 , B22D11/111 , C21C7/076
摘要： PURPOSE:To provide molding powder which lessens the amt. of the gas to be generated in a melting process, has an excellent heat insulating property and is capable of forming a stable molten mold layer on the surface of the molten steel in a casting mold and to continuously cast a slab having excellent quality by this powder. CONSTITUTION:This molding powder for continuous casting is formed by compounding a raw material for production of calcium silicate contg. CaO/SiO2 in a range of 0.6 to 1.8 and contg. 2 to 10wt.% fluorine and Al2O3 and a molding powder main raw material obtd. by melting the carbonate of alkaline metals and alkaline earth metals at 1200 to 1700 deg.C and removing carbon dioxide by cracking, then subjecting the melt to rapid cooling and water-crashed granulating at a ratio 70 to 95wt.%. The ignition loss of the carbonic acid, etc., to be incorporated from the raw materials exclusive of the carbon-component is

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