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81. 发明专利

JPH08155609A METHOD FOR CONTINUOUSLY CASTING MOLTEN METAL 失效
公开(公告)号：JPH08155609A
公开(公告)日：1996-06-18
申请号：JP30583194
申请日：1994-12-09
申请人： NIPPON STEEL CORP
发明人： SAWADA KENZO , WAJIMA KIYOSHI , TAKEUCHI EIICHI , FUJI TAKEHIKO
IPC分类号： B22D11/07 , B22D11/04 , B22D11/10 , B22D11/11 , B22D11/112 , B22D11/115 , B22D11/116 , B22D11/16
摘要： PURPOSE: To cast a cast slab having uniform surface characteristic by measuring molten metal surface variating quantity in a mold at plural positions, controlling the current conducted to electromagnetic coils according to these deformed quantities and restraining the distance of the molten metal surface. CONSTITUTION: One pair of eddy current sensors 7a, 7b are symmetrically arranged at the upper part separated by the distance (y) from the molten steel (s) surface in the mold 1. The eddy current sensors are worked through an electric source 8 and the molten steel variating quantity at the measuring point on the molten steel surface in the mold is measured at the setting timing through a timer 9. The measured informations h1 , h2 of the molten steel surface variating quantity from the eddy current sensors 7a, 7b are simultaneously transmitted to a comparing part 10 and the difference Δh of the molten steel surface variating quantity at the point is obtd. and the constant treatment is executed with a multiplier 11 and the kΔh is outputted to a comparator 12. The setting value and the kΔh are compared with this comparator 12. In the case the kΔh exceeds the permissible range, the change-over command signal of the conducting current is transmitted to an electric source control device to reduce the conducting current from the electric source 5.

82. 发明专利

JPH08155608A METHOD FOR CONTINUOUSLY CASTING MOLTEN METAL 失效
公开(公告)号：JPH08155608A
公开(公告)日：1996-06-18
申请号：JP30583094
申请日：1994-12-09
申请人： NIPPON STEEL CORP
发明人： SAWADA KENZO , WAJIMA KIYOSHI , TAKEUCHI EIICHI , FUJI TAKEHIKO
IPC分类号： B22D11/07 , B22D11/04 , B22D11/10 , B22D11/115 , B22D27/02
摘要： PURPOSE: To restrain the disturbance of molten metal surface at the same time of pinching the molten metal in a mold and to obtain the uniform surface characteristic by providing two sets of electromagnetic coils in parallel at the outside of a fixed mold pouring and solidying the molten metal and conducting the electric current from two sets of small capacity electric sources in a low cost to these two sets of electromagnetic coils, respectively. CONSTITUTION: A current control device 7 commands a conducting current condition to the electric sources 5a, 5b according to the current conducting condition set to a setter 8. In the setter 8, the combination of current waveform of conducting current, conducting current, conducting time, these changing over conditions, etc., to the electromagnetic coils 3a, 3b from two electric sources 5a, 5b are set, and the electric current conduction is continuously executed to the electromagnetic coils 3a, 3b from the electric sources 5a, 5b. In this way, the molten metal in the mold is pinched by combining the current waveform of the conducting current from two small capacity electric source and conducting the electric current and also, the disturbance of the meniscus is restrained and the cast slab having good surface characteristic can be cast.

83. 发明专利

JPH08155606A METHOD FOR CONTINUOUSLY CASTING MOLTEN METAL 失效
公开(公告)号：JPH08155606A
公开(公告)日：1996-06-18
申请号：JP30582894
申请日：1994-12-09
申请人： NIPPON STEEL CORP
发明人： SAWADA KENZO , WAJIMA KIYOSHI , TAKEUCHI EIICHI , FUJI TAKEHIKO
IPC分类号： B22D11/07 , B22D11/04 , B22D11/059 , B22D11/10 , B22D11/115 , B22D27/02
摘要： PURPOSE: To restrain the concentration of electromagnetic force at the corner part of a mold, to uniformize the electromagnetic force and to cast a cast slab having sufficiently uniform surface characteristic by constituting the corner part and the neighbor part of the mold with a material having electric resistant rate lower than a material constituting the other part. CONSTITUTION: The corner part 1c of the copper plate 1a forming the mold 1 is formed with the material having low electric resistant rate and the other part 1b is formed with the material having the electric resistant rate larger than the material forming this corner part 1c. Therefore, the attenuation of magnetic density at the corner part 1c is made relatively large to relax the concentration of the electromagnetic force to the corner part 1c. At this time, the rage constituted of the material having low electric resistant ratio is made to be the range within 50mm from the corner part 1c of the mold. Further, in the case of constituting the mold 1 with plural materials, in order to obtain the uniformizing effect of the sufficient magnetic flux without causing the spark, the electric resistant rate in the range of 50mm from the corner part 1c is made to be 0.1-0.7 times of the electric resistant rate at the other range.

84. 发明专利

JPH08155604A METHOD FOR CONTINUOUSLY CASTING MOLTEN METAL 失效
公开(公告)号：JPH08155604A
公开(公告)日：1996-06-18
申请号：JP30582594
申请日：1994-12-09
申请人： NIPPON STEEL CORP
发明人： SAWADA KENZO , WAJIMA KIYOSHI , TAKEUCHI EIICHI , FUJI TAKEHIKO
IPC分类号： B22D11/07 , B22D11/04 , B22D11/10 , B22D11/11 , B22D11/112 , B22D11/115 , B22D11/116
摘要： PURPOSE: To prevent the attenuation of a magnetic field in a mold, to save equipment cost and electric power cost and to extend the service life of the mold by inserting an electrode on the meniscus surface of molten metal in the mold, arranging the electrode below the other electrode and conducting the electric current into the molten metal in the mold through these electrodes. CONSTITUTION: The electric current is directly conducted to the molten steel (s) in the mold 1 to give pinch force to the molten steel (s) and the neighbor part of the molten steel surface is pinched and the molten steel surface (sf) in the mold 1 is raised up to the center part side and the recessed part 7 of the molten steel surface is formed on the inner surface of the mold 1 and the molten steel surface (sf), and the feeding of lubricant P is promoted and a cast slab (sc) having good surface characteristic can be cast. In such way, since the first electrode 4 is dipped into the molten steel (s) in the mold 1 to directly conduct the electric current into the molten steel (s) and thus, the attenuation of the electromagnetic force with the mold 1 is light, the electric device having comparatively small capacity can be used, and the equipment cost and the electric power consumption can be saved.

85. 发明专利

JPH07290211A METHOD FOR INJECTING GAS TO TUNDISH FOR CONTINUOUS CASTING 失效
公开(公告)号：JPH07290211A
公开(公告)日：1995-11-07
申请号：JP10623694
申请日：1994-04-22
申请人： NIPPON STEEL CORP
发明人： OKAZAWA KENSUKE , FUJI TAKEHIKO , TAKEUCHI EIICHI
IPC分类号： B22D11/10 , B22D11/11 , B22D11/112 , B22D11/116 , B22D11/117
摘要： PURPOSE:To accelerate floating and removing of inclusions and to improve the quality of a cast slab by injecting gas into the molten metal flowing in a long nozzle, then receiving the flow of the molten metal with a cylinder-shaped object having a bottom installed in a tundish below the long nozzle. CONSTITUTION:The gas is injected 2 into the molten metal in the process of injecting the molten metal from a ladle into the tundish 4. Formed gaseous bubbles 6 flow together with the flow of the molten metal into the cylinder- shaped object 5 and are made finer by the turbulence in the cylinder-shaped object 5. The density of the number of the gaseous bubbles is increased and the probability of flocculating and joining with the inclusions is increased by making the gaseous bubbles finer and, therefore, the effect of floating and removing the inclusions is high. The gaseous bubbles 6 are made sufficiently finer by the turbulence in the cylinder-shaped object 5 and, therefore, the effect of improving the effect of floating the inclusions is high and the quality of the cast slab is improved.

86. 发明专利

JPH07290195A PRODUCTION OF CONTINUOUSLY CAST SLAB 失效
公开(公告)号：JPH07290195A
公开(公告)日：1995-11-07
申请号：JP10612194
申请日：1994-04-21
申请人： NIPPON STEEL CORP
发明人： TAKEUCHI EIICHI , TANAKA MAKOTO , HARADA HIROSHI
IPC分类号： B22D11/00 , B22D11/04 , B22D11/10 , B22D11/108 , B22D11/11 , B22D11/112 , B22D11/115 , B22D11/116
摘要： PURPOSE:To uniformize the concn. of solute in each pool at the time of continuously casting a duplex layer cast slab by supplying molten steels having different compositions in respective pools at the upper and the lower parts inside continuous cast strand pools divided with DC magnetic field. CONSTITUTION:The DC magnetic field 10 having uniform strength in the width direction of the cast slab is applied to the cast slab while passing through the thickness of the cast slab at a part a fixed distance below molten steel meniscus in a continuous casting mold 1. The molten steel having a fixed composition is poured into the lower pool 5 divided with the DC magnetic field 10 while adjusting the angle of discharging hole of an immersion nozzle 13 by

87. 发明专利

JPH07256410A METHOD FOR CONTINUOUSLY CASTING MOLTEN METAL 失效
公开(公告)号：JPH07256410A
公开(公告)日：1995-10-09
申请号：JP5087294
申请日：1994-03-22
申请人： NIPPON STEEL CORP
发明人： FUJI TAKEHIKO , OKAZAWA KENSUKE , TAKEUCHI EIICHI , FUJISAKI KEISUKE
IPC分类号： B22D11/10 , B22D11/04 , B22D11/103 , B22D11/11 , B22D11/112 , B22D11/115 , B22D11/116
摘要： PURPOSE:To prevent the development of stagnation and eddy current by making a spouted flow from a pouring nozzle for molten metal flat in shape and flow downward and avoiding the interference of the poured flow with a circulation stirring flow by an electromagnetic coil. CONSTITUTION:At the time of impressing shifting magnetic field 6 to the molten steel 7 in a mold 2 through electromagnetic coils 1 arranged so as to confront each other along the long sides of the mold 2, the circulation stirring flow 4 is developed in a horizontal direction. The shape of the pouring nozzle 3 is made flat while matching the cross sectional shape of the mold 2 and the spouting hole is made a slit type with opened lower end. The molten steel 7 is poured downward from the spouting hole so that the poured flow does not interfere with the circulation stirring flow 4. In order to avoid the interference, the tip of the nozzle 3 is preferably positioned below the lower end of the coil 1. By this method, the uniform cast slab without defect can be obtd.

88. 发明专利

JPH07256396A MANUFACTURE OF DOUBLE LAYERED MATERIAL 失效
公开(公告)号：JPH07256396A
公开(公告)日：1995-10-09
申请号：JP7387694
申请日：1994-03-18
申请人： NIPPON STEEL CORP
发明人： MATSUMIYA TORU , TAKEUCHI EIICHI
IPC分类号： B22D11/00 , B22D27/04 , B22D27/20
摘要： PURPOSE:To provide a manufacturing method for a double layered material capable of suppressing the mixture of the melts, and expanding the range of combination of the materials of each layer in the method to manufacture the double layered material using a mold. CONSTITUTION:The prescribed element among the elements of the melt A, B are used as the elements for adjusting the specific gravity, and the specific gravity of the melt A is made approximately same as that of the melt B by adjusting the concentration of the elements for adjusting the specific gravity. The elements for adjusting the specific gravity whose diffusion coefficient in thc solid phase is larger than that of other elements, and whose diffusion in the liquid phase is approximately same as that of other elements are used. The double layered material having the prescribed composition is manufactured by diffusing only the elements for adjusting the specific gravity after the melts A, B are solidified.

89. 发明专利

JPH06304706A METHOD OR CONTINUOUSLY CASTING DOUBLE LAYER CAST SLAB 失效
公开(公告)号：JPH06304706A
公开(公告)日：1994-11-01
申请号：JP11922393
申请日：1993-04-23
申请人： NIPPON STEEL CORP
发明人： TAKEUCHI EIICHI , SEZE AKIFUMI , HARADA HIROSHI , TANAKA HIROYUKI
IPC分类号： B22D11/00 , B22D11/10 , B22D11/103 , B22D11/115
摘要： PURPOSE:To provide a continuous casting method for directly producing a double layer cast slab composed of the same components in the surface layer and the inner surface of a cast slab and consists of the layers having high cleanliness. CONSTITUTION:DC magnetic field zone is formed at the lower position in the casting direction from a meniscus Z0. The molten steels having the same composition and the same temp. are supplied through two pieces of nozzles 2, 3 having different lengths and inserted into the upper and the lower parts to this DC magnetic field zone and solidified and drawn out to produce the double layer cast slab composed of the metals having the same components in the surface layer and the inner layer. By this method, the double layer cast slab composed of the same components in the surface layer and the inner layer and having the high cleanliness can be produced.

90. 发明专利

JPH06304702A METHOD FOR CONTINUOUSLY CASTING HOLLOW CAST BILLET 失效
公开(公告)号：JPH06304702A
公开(公告)日：1994-11-01
申请号：JP10159493
申请日：1993-04-27
申请人： NIPPON STEEL CORP
发明人： HARADA HIROSHI , SEZE AKIFUMI , TAKEUCHI EIICHI
IPC分类号： B22D11/00 , B22D11/20
摘要： PURPOSE:To stably produce a hollow cast billet without defect on the inner surface by setting casting condition so as to satisfy a prescribed expression, at the time of continuously casting the hollow cast billet by using a water cooling type columnar core for forming the inner surface of the cast billet. CONSTITUTION:At the time of continuously casting the hollow cast billet by using the water cooling type columnar core for forming the inner surface of the cast billet, the casting condition is set so that solidification constant K1 of core, distance L1 from the meniscus to the lowermost end of core, solidification constant K2 of the mold forming the outer surface of the cast billet, distance L2 from solidification starting position to the lowermost end of the core, casting velocity V and the thickness D of the cast billet satisfy the expression K1X(L1/V) +K2X(L2/V) >=0.5D. By this method, the problem of development of bleed and breakout on the inner surface of cast billet is solved, and the hollow cast billet having no problem can stably be produced.

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