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1. 发明专利

JPH04210166A DETACHABLE SEALING DEVICE FOR HIGH-TEMPERATURE PORTION 失效
公开(公告)号：JPH04210166A
公开(公告)日：1992-07-31
申请号：JP33921490
申请日：1990-11-30
申请人： HAMADA JUKO , NIPPON STEEL CORP
发明人： TSURUOKA SHIGEO , KANDA KATSUNORI , OKADA KAZUSHI
IPC分类号： F16B2/10 , B22D41/60 , C21C5/46 , F16J15/00 , F27D7/06 , F27D21/00
摘要： PURPOSE:To repeatedly use a refractory for use at high temperature by disposing a flexible refractory for high temperature on the inside of a metallic ring divided into two portions, and providing on the inside of the refractory a guide member for adjusting the center of axis. CONSTITUTION:A detachable sealing device 10 for a high-temperature portion comprises a seat plate 12 provided on the upper portion of a lower preheating room (or drying room)11, a metallic ring disposed on the seat plate 12 and divided into two semicircular portions 13, 14, a fibrous refractory 15 such as asbestos, glass wool, rock wool, etc., serving as an example of a flexible refractory for use at high temperature mounted in two stages on the inside of the metallic rings 13, 14, a coupling shaft 16 coupling the metallic rings 13, 14 together in such a manner as freely rotating the rings 13, 14 via support arms 13a to 14a, control levers 17, 18 mounted to the respective other ends of the support arms 13a, 14a, and guide members 19, 20 both attached to the metallic rings 13, 14.

2. 发明专利

JPH0433771A DEVICE FOR CLOSING NOZZLE FOR MOLTEN METAL 失效
公开(公告)号：JPH0433771A
公开(公告)日：1992-02-05
申请号：JP14028790
申请日：1990-05-29
申请人： KUROSAKI REFRACTORIES CO , NIPPON STEEL CORP
发明人： FUNATO JUNICHI , TAKAGI NOBUAKI , TSURUOKA SHIGEO , MURAYAMA MASANAO
IPC分类号： B22D11/10 , B22D41/34 , B22D41/56
摘要： PURPOSE:To quickly interrupt molten metal by setting a stopper plate at a preparatory position of a nozzle moving passage during casting, moving the stopper plate to an outlet of the molten metal with a nozzle moving means in an emergency and simultaneously pushing out a dipping nozzle. CONSTITUTION:The stopper plate 50 has a holder 51 and a plate brick 52. The plate brick 52 is supported by springs 55 at four places through a metallic or ceramic plate base 53. In the stopper plate 50, the upper surface of the stopper plate 50 is a little higher than the lower surface of the lower nozzle 8. The tip of the plate brick 52 is tapered and when it strikes the lower nozzle 8, it is made to enter the lower part of the lower nozzle 8. When the plate brick 52 is pressed down and the springs 55 are bent, the plate brick 52 is pressed by the springs 55 and the nozzle hole is closed as it is pressed by the lower nozzle 8. At this time. the bend of the spring 55 are equal to the amount by which the position of the lower surface of the lower nozzle 8 interferes with the plate brick 52.

3. 发明专利

JPH03231121A WEIGHT MEASURING DEVICE 失效
公开(公告)号：JPH03231121A
公开(公告)日：1991-10-15
申请号：JP2607990
申请日：1990-02-07
申请人： NIPPON STEEL CORP
发明人： TSURUOKA SHIGEO , KUROKAWA TETSUAKI , YUKI EIJI
IPC分类号： G01G3/14 , B22D11/16 , B22D46/00 , G01G21/06 , G01G21/23
摘要： PURPOSE:To perform measurement accurately by simple working operation by providing a load-cell supporting member between a heavy body and a load cell, and eliminating the deviation between the heavy body and the supporting member. CONSTITUTION:A load-cell supporting member 5 is provided between a heavy body 1 and a load cell 6. The supporting member 5 is constituted of a large- diameter bearing 2, a plurality of small-diameter bearings 3 and a spherical- surface shaped groove 4. The body 1 is in contact with the bearing 2. A plurality of the bearings 3 are in contact with the lower part of the bearing 2. The diameter of the spherical-surface shaped groove 4 is made to be the sum of the diameters of the bearings 2 and 3. In this constitution, when the body 1 is set on a plurality of load cells and the body 1 and the member 5 are deviated, the bearings 2 and 3 are rotated and the deviation is removed. Thus, the weight of the body 1 is accurately transferred to the load cell 6 and measured.

4. 发明专利

JPH03202420A SKIMMER FOR MOLTEN STEEL SUCTION PIPE OF VACUUM DEGASSING EQUIPMENT 失效
公开(公告)号：JPH03202420A
公开(公告)日：1991-09-04
申请号：JP34416489
申请日：1989-12-28
申请人： KUROSAKI REFRACTORIES CO , NIPPON STEEL CORP
发明人： KINOSHITA OSAMU , KISHIMOTO YASUO , TSURUOKA SHIGEO , ENOMOTO SHIGERU
IPC分类号： C21C7/10 , C21D7/10 , F27D3/15
摘要： PURPOSE:To efficiently remove the slag and base metal stuck to the suction pipe and to improve the working rate of a DH-type vacuum decarburization refiner by providing a rotating and lifting turntable having a cutter and a grinder below a molten steel suction pipe of the refiner. CONSTITUTION:Molten steel is discharged, degassed and refined by the DH-type vacuum degassing refiner 50. In this case, molten steel and slag are stuck in layers to the periphery of a suction pipe 51 for sucking the molten steel in a ladle into a vacuum vessel. The turntable 2 capable of being rotated and lifted as the device for removing the stuck base metal and slag is provided to a truck 1 traveling on a rail 52 directly below the suction pipe 51, and a cutter 5 and a grinder 6 are furnished to the turntable. A slit is cut in the layer of stuck base metal and slag on the suction pipe 51 by the cutting edge 7 fixed to the cutter 5, and then the slit base metal and slag are ground by the blade 10 fixed to the grinder 6, dropped into a hopper 11a from a chute 11 and recovered.

5. 发明专利

JPH02142657A APPARATUS FOR CONTROLLING CONTINUOUS CASTING PROCESS 失效
公开(公告)号：JPH02142657A
公开(公告)日：1990-05-31
申请号：JP29364288
申请日：1988-11-22
申请人： NIPPON STEEL CORP
发明人： KUROKAWA TETSUAKI , MURAYAMA MASANAO , TSURUOKA SHIGEO
IPC分类号： B22D11/16 , B22D11/18
摘要： PURPOSE:To facilitate control at the time of continuously operating by providing gradient control means, which continuously executes the control to increasing rate of molten metal surface level, at the time of starting the continuous casting. CONSTITUTION:As a first molten metal surface level detecting means 10, a molten metal surface level sensor, which has good responsibility but narrow detecting range and easily develops variation of offset, is used. As a second molten metal surface level detecting means 12, a molten surface level sensor, which wide detecting range and to offset but some problem at point of the responsibility, is used. Then, at the time of starting up, by using a detector changing means 22, the molten metal surface level can be continuously measured with the second molten metal surface level detecting means 12 since low molten metal surface level. When the molten metal surface level comes to the detecting range of the first molten metal surface level detecting means 10, the second detecting means 12 is changed over to the first detecting means 10 and at the same time, the offset is corrected. Therefore, at the time of starting up, the molten metal surface rising speed is precisely controlled with the gradient control means 24 based on the level of the detecting means 12, and after shifting to continuous operation, the control means 20 executes the molten metal surface level control based on the molten metal surface level detected with the detecting means 10.

6. 发明专利

JPS59222519A MANUFACTURE OF EXTRA-LOW BORON STEEL BY REFINING 失效
公开(公告)号：JPS59222519A
公开(公告)日：1984-12-14
申请号：JP9679983
申请日：1983-05-31
申请人： NIPPON STEEL CORP
发明人： TSURUOKA SHIGEO , YAMADA YOUZOU , OKUMURA HARUHIKO , ANDOU MICHIHIDE
IPC分类号： C21C7/00 , C21C7/06 , C22C33/04
摘要： PURPOSE:To manufacture a low B steel with little brittleness by deoxidizing a molten steel discharged from a steel manufacturing furnace up to a specified oxygen content and by adding an alloy material for regulating the composition. CONSTITUTION:A molten steel discharged from a steel manufacturing furnace into ladle is deoxidized up to 100-400ppm O2 content by adding Fe-Mn, Fe-Si, Fe-Al or the like. After discharging molten slag from the ladle, a necessary ferrroalloy is added to regulate the composition of the molten steel. No boron is restored from molten slag, and since the O2 content is proper, very little boron enters the molten steel from the ferroalloy for regulating the composition. A low B steel free from defects such as red shortness due to Fe2B is obtd.

7. 发明专利

JPS589913A CONTROLLING METHOD FOR CONTENT OF NITROGEN IN STEEL 失效
公开(公告)号：JPS589913A
公开(公告)日：1983-01-20
申请号：JP10627681
申请日：1981-07-09
申请人： NIPPON STEEL CORP
发明人： TSURUOKA SHIGEO , ISHIWATARI NOBUYUKI
IPC分类号： C21C7/00 , C21C5/28
摘要： PURPOSE:To improve the accuracy in hitting of the content of nitrogen in steel and to eliminate influence upon the controlling of other components such as Mn by estimating the content of nitrogen during tapping of steel from a converter from the content of free oxygen detected when the converter is blown out, and adding a specific nitrogen source at proper timings. CONSTITUTION:Steel is beforehand refined in a converter at the content of nitrogen therein slightly lower than a desired content, and when the converter is blown out, the content of free oxygen in molten steel is directly detected. The relation between the content of free oxygen and the content of nitrogen in such molten steel is as shown in the figure, from which the content of nitrogen of the molten steel in the blowing-out time can be estimated. The difference from a required content of nitrogen is determined from the estimated value, and a required amt. of a nitrogen source is added into a ladle during tapping. The basic flux consisting essentially of >=20% CaO and 10-50% N2 (generally called lime nitrogen) is used for the nitrogen source. Such flux is added during the time since tapping until the steel is received in the ladle to 1/2 its capacity. If it is added later than this time, the flux is difficult to be included in the molten metal and is extremely unstable because the nitrogen source is light, thus affecting the yield of nitrogen.

8. 发明专利

JPS583913A PRODUCTION OF LOW HYDROGEN STEEL BY WHICH FORM OF SULFIDE IS CONTROLLED 失效
公开(公告)号：JPS583913A
公开(公告)日：1983-01-10
申请号：JP10128581
申请日：1981-07-01
申请人： NIPPON STEEL CORP
发明人： NAKAMURA KOUICHI , TSURUOKA SHIGEO , ISHIWATARI NOBUYUKI , TOKITA MATSUO
IPC分类号： C21C7/072 , C21C7/10
摘要： PURPOSE:To produce a titled low hydrogen steel stably in a short treatment time by blowing a CaO-contg. flux to molten steel which is beforehand subjected to a disoxidizing treatment thereby disoxidizing and desulfurizing the steel then subjecting the same to a vacuum degassing treatment followed by blowing of a Ca alloy to the molten steel. CONSTITUTION:A CaO-contg. flux is blown by a carrier gas to the molten steel which is beforehand subjected to a disoxidizing treatment, whereby said steel is dis oxidized and desulfurized. The content of hydrogen in the molten steel is increased by this desufurization stage. Therefore, the steel is next subjected to a vacuum degassing treatment to decrease the content of hydrogen in the molten steel down to about a desired level. A Ca alloy is blown to this steel to control the form of sulfide in the molten steel. At this time, the content of hydrogen changes hardly and is maintained at a low level. Therefore, in this way, it is possible to produce the low hydrogen steel stably.

9. 发明专利

JPS56108818A REFINING AGENT OF MOLTEN STEEL 失效
公开(公告)号：JPS56108818A
公开(公告)日：1981-08-28
申请号：JP1154480
申请日：1980-02-04
申请人： DENKI KAGAKU KOGYO KK , NIPPON STEEL CORP
发明人： NAKASHIMA HIROYUKI , TSURUOKA SHIGEO , KAIZU HISAYASU , KANEKO SHINICHI
IPC分类号： C21C7/04 , C21C7/076
摘要： PURPOSE:To considerably improve slaking resistant property and refining effect by consisting a refining agent of CaO and alkaline earth metal fluoride of a specific compositions, coating alkaline earth metal fluoride on CaO matrix surfaces in a liquid phase state and solidifying the same. CONSTITUTION:Calcium carbonate as a CaO source, quicklime, and fluorite as, for example, a CaF2 source are compounded in a manner as to be contained at 90- 95wt% CaO and 5-10wt% CaF2. These are charged into a rotary kiln. Thereupon, the mixture is fired at temp. above the softening point of alkaline earth metal fluoride and is ground after cooling. Then, the alkaline earth metal fluoride is coated in a liquid phase state on the surface of CaO matrix and is solidified.

10. 发明专利

JPS565915A PRODUCTION OF STEEL FOR STEEL CORD 失效
公开(公告)号：JPS565915A
公开(公告)日：1981-01-22
申请号：JP8235879
申请日：1979-06-29
申请人： NIPPON STEEL CORP
发明人： FUKUDA MASAHIRO , TSUJINO RIYOUJI , TSURUOKA SHIGEO , SHINODA KENZOU
IPC分类号： C21C7/00 , C21C7/06 , C22C33/04
摘要： PURPOSE:To produce steel for steel cords of 20 or less in nonductile inclusion index by predeoxidizing the molten steel which has been tapped under perfect Al control by using the flux containing CaO then blowing a slight amount of the alloy containing one or more kinds of Ca, Mg and REM. CONSTITUTION:The flux containing CaO is blown together with inert gas into the foregoing molten steel in a ladle, by which the molten steel is predeoxidized until the total oxygen at the tapping reaches the hitting levels of approximately 20- 30ppm. Next, the alloy containing one or more kinds of Ca, mg and REM (rare earth elements) is added in a slight amount (e.g. 0.1-0.2kg/T-S) in this molten steel after the predeoxidation to soften its inclusions. The inclusions formed at this time become the inclusions of low melting points of multiple-element base of MnO, SiO2, Al2O3, CaO and MgO. As a result of this, the steel which is used for wire materials for steel cords of 20 or less in nonductile inclusion index is obtained.

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