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21. 发明专利

JPH0466267A INSTRUMENT FOR DETECTING MOLTEN STEEL LEVEL IN TUNDISH 失效
公开(公告)号：JPH0466267A
公开(公告)日：1992-03-02
申请号：JP17532490
申请日：1990-07-04
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI , MISAKI NORIO , TAKE HIDEO
IPC分类号： G01F23/24 , B22D11/16 , B22D39/02 , B22D41/50
摘要： PURPOSE:To accurately detect remaining molten steel quantity in a tundish by burying one pair of electric conductive refractories mutually being apart at the same level in the ordinary refractory in the tundish so as to expose on inner face of the tundish and connecting with the fixed voltage electric source. CONSTITUTION:One pair of electric conductive refractories 11 are buried as being apart at the same level in the ordinary refractory 12 in the tundish 6 so as to expose on the inner face of tundish 6. The fixed voltage electric source 13 for impressing the voltage to these one pair of the electric conductive refractories 11, is connected and a displayed lamp 14 for turning on a light at the time of conducting the electricity is arranged. In this constitution, at the time of casting a cast slab 8 by pouring molten steel 5 into a mold 7 from the tundish 6, the molten steel 5 level is lowered at the end period of casting, and by bringing the slag 9 into contact with the electric conductive refractory 11, as the electric resistance is large, the electricity is scarcely conducted and the voltage and the current are drastically varied. By this method, the detection of remaining molten steel 5 level is accurately executed and involution of slag 9 into the mold 7 and the excessive remaining steel quantity are released.

22. 发明专利

JP2002239687A CONTINUOUS CASTING FACILITY HAVING MAGNETIC FIELD IMPRESSING FUNCTION IN MOLD 失效
公开(公告)号：JP2002239687A
公开(公告)日：2002-08-27
申请号：JP2001033568
申请日：2001-02-09
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI , ASAHINA TAKESHI , OSANAI HISASHI
IPC分类号： B22D11/04 , B22D11/128
摘要： PROBLEM TO BE SOLVED: To obtain a sound cast slab in which pushing flaw on the cast slab caused by a seal material, such as an expand metal, whisker-state iron powder, used in the unsteady part at the starting time of continuous casting and a joint part of different kinds of steels, etc. is eliminated and the surface defect is not developed. SOLUTION: In a continuous casting facility having a magnetic field impressing function in a mold, with which the flowing of molten steel is controlled by impressing the magnetic field to the molten steel in the mold from the back surfaces of side walls in the mold, and this molten steel is ordinarily cooled between roll group succeeded to the lower part of the mold to make the continuously cast slab, among the above roll group, the rolls in the range of 1000 mm from the lower end of the mold are used to non-magnetic rolls.

23. 发明专利

JP2001262214A METHOD FOR REFINING MOLTEN IRON ALLOY 失效
公开(公告)号：JP2001262214A
公开(公告)日：2001-09-26
申请号：JP2000073667
申请日：2000-03-16
申请人： KAWASAKI STEEL CO
发明人： OGAWA HISASHI , OGURA SHIGERU , SEKIGUCHI HIROSHI , TAKE HIDEO
IPC分类号： C21C5/28 , C21C7/00 , C21C7/04 , C21C7/064
摘要： PROBLEM TO BE SOLVED: To provide a converter steelmaking method by which molten steel having a prescribed composition can stably be produced without using fluorspar and to provide a method for utilizing the formed slag. SOLUTION: In the molten iron alloy refining method removing impurities in the molten iron alloy by using a basic slag, a virtual slagging ratio Ec is obtained by extrapolating a CaF2 content in the slag to zero from a relationship between the CaF2 content in the slag in the refining using the slag containing the CaF2 and the slagging ratio of lime. Further, the slagging lime necessary amount W1 needed to achieve an impurity component removing ratio targeted from the refining condition in a heat to be refined is estimated, a lime amount W2 to be added is calculated using the following equation from the virtual slagging ratio Ec (unit: %) and the slagging lime necessary amount W1, and the adding amount of auxiliary material containing the lime is decided using this W2 and the molten iron alloy is refined in a refining furnace. W2=100×W1/Ec.

24. 发明专利

JPH10263770A METHOD FOR REPAIRING SCARFING OF SLAB 失效
公开(公告)号：JPH10263770A
公开(公告)日：1998-10-06
申请号：JP7532397
申请日：1997-03-27
申请人： KAWASAKI STEEL CO
发明人： KUROKAWA KATSUMI , SEKIGUCHI HIROSHI , SUGISAWA MOTOTATSU
IPC分类号： B22D11/12 , B22D11/16 , B23K7/06
摘要： PROBLEM TO BE SOLVED: To prevent generation of transformation cracks or thermal strain cracks caused by the scarfing, and to prevent the oxide from being left behind even in a case of the special steel high in crack sensitivity in repairing the scarfing of the slab. SOLUTION: In a scarfing repairing method of the slab, the slab surface temperature Ts( deg.C) immediately before repairing the scarfing is in the range to satisfy the inequality Ts( deg.C)>=[Ceq]( deg.C)-150 deg.C, where [Ceq]=[C]+[Si]/24+[Mn]/6+[Ni]/40 +[Cr]/5+[Mo]/4+[V]/14, regarding [Ceq] to be calculated from the composition of the slab, and in addition, the upper limit of Ts( deg.C) is

25. 发明专利

JPH0679422A METHOD FOR CONTINUOUSLY MEASURING MOLTEN STEEL TEMPERATURE IN TUNDISH 失效
公开(公告)号：JPH0679422A
公开(公告)日：1994-03-22
申请号：JP21158291
申请日：1991-07-29
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI , TAKE HIDEO
IPC分类号： B22D11/10 , B22D11/108 , B22D11/111 , B22D11/16 , G01K1/08 , G01K7/02
摘要： PURPOSE:To extend the service life of an expensive ZrB2 thermocouple protecting tube and to improve a continuous casting control by employing a compd. having m.p. higher than a specific temp. for the slag to be floated on molten steel surface where the thermocouple is to be dipped. CONSTITUTION:In the continuous measuring method of the molten temp. in a tundish 2 for continuous casting by using the thermocouple having ZrB2-made protecting tube, the slag to be floated on the molten metal 4 surface where the thermocouple to be dipped is made to be of high m.p. compound of >=1800 deg.C m.p. This high m.p. compound is CaO-Al2O3-MgO series compound containing 5-30wt.% MgO. Further, this method is the one, which continuously measures the molten steel temp. by using refractory annular protector 12 at the outer peripheral part to the slag line on the molten steel to dip the ZrB2-made protecting tube 8. By this method, i.e., by adding MgO into the CaO-base slag to make the slag of high m.p., eroding speed at the slag line part is reduced and the service life of the protecting tube is extended and the operation control of the continuous casting is smoothly executed.

26. 发明专利

JPH05149770A METHOD FOR PROTECTING IN-MOLD MOLTEN METAL LEVEL DETECTING DEVICE UTILIZING EDDY CURRENT 失效
公开(公告)号：JPH05149770A
公开(公告)日：1993-06-15
申请号：JP33773891
申请日：1991-11-27
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI
IPC分类号： B22D11/16 , G01F23/26
摘要： PURPOSE:To prevent the occurrence of a disturbance caused by a material adhering to a conductor so as to accurately measure the level of a molten metal in a mold by covering the external surface of a in-mold molten metal level detector with an insulating protective pipe having specific thicknesses. CONSTITUTION:By covering the external surface of an eddy-current type molten metal level detector main body 1 with an insulating protective pipe 2, the thicknesses (a) and (b) of which are respectively >=20mm, the distance between a conductor and the main body 1 which causes such a disturbance as splash, etc., is secured and the occurrence of a measurement error caused by the disturbance is prevented. It is desirable to respectively set the thicknesses (a) and (b) at >=20mm, because no disturbance preventing effect is obtained when they (a) and (b) are set at

27. 发明专利

JPH0592243A METHOD FOR STARTING CASTING IN CONTINUOUS CASTING 失效
公开(公告)号：JPH0592243A
公开(公告)日：1993-04-16
申请号：JP25121991
申请日：1991-09-30
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI , TAKADA SHIGENOBU , TAKE HIDEO
IPC分类号： B22D11/10 , B22D41/44
摘要： PURPOSE:To start a casting without generating a nozzle clogging caused by solidification of a molten steel in the upper nozzle of a tundish. CONSTITUTION:By making the sliding plate 6 of a sliding nozzle 9 a closing condition in advance, after the formed thermite-based heating material 1 is packed into the nozzle hole over the interval from an upper nozzle 2 to the sliding plate 6, the pouring of the molten steel into the tundish 8 is started and while heating and warm-keeping the molten steel with the thermite-based heating material 1, the molten steel is pooled in the tundish 8. By melting the steel with the rise of temp. of the heating material 1, the nozzle hole is naturally opened and the casting is started.

28. 发明专利

JPH04327365A METHOD FOR PREVENTING FLOW-OUT OF SLAG FROM MOLTEN METAL HOLDING VESSEL 失效
公开(公告)号：JPH04327365A
公开(公告)日：1992-11-16
申请号：JP9914791
申请日：1991-04-30
申请人： KAWASAKI STEEL CO
发明人： SHIGA NOBUISA , BESSHO NAGAYASU , FUJII TETSUYA , SEKIGUCHI HIROSHI
IPC分类号： B22D11/10 , B22D43/00 , C21C7/00 , F27D3/15
摘要： PURPOSE:To prevent the whole eddy flow containing inclining voltex by widening the periphery of a pouring hole at the bottom part in the holding vessel in the height direction to make this conical tapered shape downward and charging a float having a yoke extended downward from the center in the specific condition. CONSTITUTION:The periphery of pouring hole 1 at the bottom part in the holding vessel is widened in the height direction and made to the conical tapered shape 3 downward, and the lower tip part of the yoke 2 in the float 1 is inserted into inside the tapered shape part 3 so as to satisfy the following condition. 1.5

29. 发明专利

JPH03170610A METHOD FOR DESULFURIZING MOLTEN IRON 失效
公开(公告)号：JPH03170610A
公开(公告)日：1991-07-24
申请号：JP30661489
申请日：1989-11-28
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI
IPC分类号： C21C1/02
摘要： PURPOSE:To efficiently desulfurize molten iron and to add Mn into the molten iron, by mixing a specific quantity of manganese ore with Na2CO3 and blowing this mixed material as the desulfurizing agent into the molten iron together with carrier gas through a blowing lance. CONSTITUTION:The powdery desulfurizing agent is blown into the molten iron together with the carrier gas of nitrogen, etc., through the blowing lance. The blowing powdery body is dispersed into the molten iron and brought into reaction with S in the molten iron to make slag on the molten iron surface while floating up. In the above desulfurizing method, the mixed material prepared by mixing 2.5-30wt.% the manganese ore expressed in terms of the quantity of MnO with Na2CO3 is used as the above desulfurizing agent. This manganese ore executes the reaction MnO+C CO+Mn in the molten iron and restrains the vaporization of Na2CO3 and also generates Mn. By this method, the desulfurizing efficiency in the molten iron is improved and also Mn can be added into the molten iron at pretreating stage.

30. 发明专利

JPH0243314A METHOD FOR HEATING UP MOLTEN STEEL 失效
公开(公告)号：JPH0243314A
公开(公告)日：1990-02-13
申请号：JP19166688
申请日：1988-07-30
申请人： KAWASAKI STEEL CO
发明人： SEKIGUCHI HIROSHI , OKUDA HARUYUKI , TAKE HIDEO
IPC分类号： C21C7/00
摘要： PURPOSE:To inexpensively and rapidly heat up a molten steel by supplying a mixture composed of aluminum and iron oxide specified in the weight ratio of Al/Fe2O3 into a ladle during receiving of the molten steel from a refining furnace into the ladle. CONSTITUTION:An exothermic agent which is the mixture composed of the aluminum and the iron oxide is supplied to the molten steel in the ladle and the molten steel is heated up by utilizing a thermit reaction at the time of tapping from the refining furnace. The mixture composed of the aluminum and the iron oxide at Al/Fe2O3=3/1-1/2 ratio by weight is supplied into the molten steel of the ladle during tapping into the ladle. The molten steel is inexpensively and rapidly heated up in this way.

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