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1. 发明专利

JP2002153955A METHOD FOR CONTINUOUSLY CASTING BILLET 失效
公开(公告)号：JP2002153955A
公开(公告)日：2002-05-28
申请号：JP2000355264
申请日：2000-11-22
申请人： NIPPON STEEL CORP
发明人： TANAKA SHIGENORI , UCHIMURA MITSUO , TOKI MASAHIRO , TOMINO SHINICHIRO
IPC分类号： B22D11/128
摘要： PROBLEM TO BE SOLVED: To make a continuous casting facility as simple as possible while improving internal crack when segregation is improved by performing light rolling reduction. SOLUTION: (1) In a method for continuously casting a billet, two or more pairs of rolls for light rolling reduction are used and the roll interval is controlled to >=L1 in the (1) equation. L1=10×(VC×100/60)...(1) wherein, L1: the roll interval in the minimum light rolling reduction (mm), VC: casting speed of the billet (m/min). (2) The above (1) equation is satisfied and the roll interval in the light rolling reduction is controlled to >=L2 in the continuous casting method of the billet L2=20×(VC×100/60)...(2) Wherein, L2: the roll interval in the maximum light rolling reduction (mm).

2. 发明专利

JPH08300113A METHOD FOR REDUCING NON-METALLIC INCLUSION IN CONTINUOUS CASTING 失效
公开(公告)号：JPH08300113A
公开(公告)日：1996-11-19
申请号：JP12757295
申请日：1995-04-28
申请人： NIPPON STEEL CORP
发明人： MIYAZAWA KENICHI , UCHIMURA MITSUO , SUGIMARU SATOSHI
IPC分类号： B22D11/10 , B22D11/11 , B22D11/112 , B22D11/115 , B22D11/116 , B22D27/02 , B22D43/00
摘要： PURPOSE: To prevent the deep invasion of molten steel downward in molten steel pool and to remove non-metallic inclusion at the upper part in a mold by arranging a molten steel parting plate at the lower end of an immersion nozzle and stirring the molten steel at the upper part in the mold. CONSTITUTION: The molten steel 4 flowed into the mold 1 through spouting holes 9 of the immersion nozzle 2 during casting is flowed into the upper range with a molten steel parting plate 3. The molten steel 4 is solidified by a heat alleviation from the molten steel 4 to the mold 1 to form solidified shell 6. The molten steel 4 at the upper part of the partition plate 3, too, is passed through a gap between the parting plate 3 and the solidified shell 6 at the straightening slow flowing speed and shifted downward accompanied with the shift of the solidified shell 1. By this method, the invading depth of the desending flow can be reduced. Further, the molten steel 4 at the upper part of the parting plate 3 is stirred by using an electromagnetic stirring device 5 and the inclusion is efficiently floated up and removed in a narrow range at the upper part in the mold 1. By this method, the clean steel can be produced.

3. 发明专利

JPH08229643A MOLTEN METAL CLEANING METHOD TO REMOVE AIR BUBBLE AND INCLUSION AND DEVICE THEREFOR 失效
公开(公告)号：JPH08229643A
公开(公告)日：1996-09-10
申请号：JP3638095
申请日：1995-02-24
申请人： NIPPON STEEL CORP
发明人： UCHIMURA MITSUO , SUGIMARU SATOSHI , NAKADA MASAHIRO
IPC分类号： B22D11/10 , B22D11/11 , B22D11/112 , B22D11/116 , B22D11/117 , B22D43/00 , C21C7/072
摘要： PURPOSE: To prevent air bubble from intruding into a mold by blowing in inert gas from the inner wall of cylinder arranged between an immersion nozzle and tundish and reducing the speed of molten metal passing through a cylinder slower than of elevating speed of bubble. CONSTITUTION: A cylinder 12 is arranged between a tundish 9 and mold 10. Inert gas 8 is blown in molten metal from a porous plug 1 arranged in the inner wall of a cylinder 12. The flow rate is controlled by operating a stopper 11, etc., so that the following inequalities are satisfied. 0.6>(t/(ρ.S)). 0.6>(t/(ρ.π.(R - ρ (). S; cross section area (m ), t; passing molten metal quantity (t/s), ρ; density of molten metal (t/m ), R; inner diameter of cylinder to which gas is blown in (m), r; radius of stopper (m) π; ratio of circumference of circle to its diameter. By this method, generation of nozzle clogging is reduced.

4. 发明专利

JPH08150448A METHOD AND DEVICE FOR PREVENTING CLOGGING OF LADLE NOZZLE 失效
公开(公告)号：JPH08150448A
公开(公告)日：1996-06-11
申请号：JP29188694
申请日：1994-11-28
申请人： NIPPON STEEL CORP
发明人： UCHIMURA MITSUO , KIYOSE AKITO , GOTO HIRONORI , MIYAZAWA KENICHI
IPC分类号： B22D11/10 , B22D11/11 , B22D11/112 , B22D11/115 , B22D11/116 , B22D11/117 , B22D11/119 , C21C7/00 , C21C7/072
摘要： PURPOSE: To prevent the clogging of a ladle nozzle with a simple device and method by fitting the device for floating-up and removing inclusions just in the front of the ladle nozzle. CONSTITUTION: An electromagnetic stirring device 1 is arranged between the sliding nozzle 6 and the ladle, and while giving the rotating movement to the molten metal with this device, inert gas 3 is blown from the wall surface of a porous plug or a slit structure gas blowing refractory 2. The inert gas 3 is formed as fine bubbles 4 is accumulated, coarsened and floated up with centrifugal force accompanied with the rotation. The molten metal near the wall surface of the gas blowing refractory 2 accompanied with the behavior of the bubbles becomes the rotation descending flow and the molten metal near the center part becomes the rotation ascending flow. A part of the suspended inclusions containing the fine inclusions in the molten metal is carried with the molten metal stream and ascended and further, caught into the bubbles 4 and floated up. In such way, the inclusions containing the fine inclusions in the molten metal is floated up and removal to prevent the clogging of the ladle nozzle. By this method, the cleaning of the molten metal can be realized.

5. 发明专利

JPH0632652A PLATE REFRACTORY FOR SLIDING NOZZLE 失效
公开(公告)号：JPH0632652A
公开(公告)日：1994-02-08
申请号：JP20945192
申请日：1992-07-15
申请人： NIPPON STEEL CORP , KUROSAKI REFRACTORIES CO
发明人： HIROMATSU TAKASHI , UCHIMURA MITSUO , YAMADA YASUHIRO , NITAWAKI SOUICHIROU
IPC分类号： C04B35/48
摘要： PURPOSE:To provide the subject refractory for continuous casting comprising ZrO2, CaO and C at specific proportion and containing no free CaO, capable of effectively preventing alumina deposition. CONSTITUTION:The objective refractory, a refractory composition containing >=90wt.% of a refractory comprising (A) 75-90wt.% of ZrO2, (B) 10-25wt.% of CaO and (C) 0-15wt.% of C and containing no free CaO. This refractory is used as a plate refractory for sliding nozzle as shown in the figure. The carbon source, which is natural or artificial graphite, is pref. >=80% in purity. The CaO, because of being problematic in slaking in a free form, is used in the form of CaZrO3, CaCO3, or CaO-stabilized ZrO2, being pref. >=80% in purity, a fused or sintered compact being usable; its crystal size is recommended to be

6. 发明专利

JPH05220555A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH05220555A
公开(公告)日：1993-08-31
申请号：JP5720492
申请日：1992-02-12
申请人： NIPPON STEEL CORP
发明人： UCHIMURA MITSUO , GOTODA HIDEAKI
IPC分类号： B22D11/12 , B22D11/16 , B22D11/20 , C21D9/00
摘要： PURPOSE:To improve the consumed energy and the yield in blooming heating of a cast slab cast with light rolling reduction casting and the realize the stability of quality. CONSTITUTION:The deteriorated segregation cast slab caused by reduction of casting speed in the light rolling reduction is discriminated and separated by a solidified time in the cast slab at the time of reducing the casting speed and the solidified time when this cast slab reaches to rolling reduction zone, and the blooming heating condition of the good segregation cast slab is executed at low temp. and in short time. Therefore, the consumed energy is little and the iron yield is good and the stable quality product can be supplied.

7. 发明专利

JPH0596348A METHOD FOR CONTINUOUSLY CASTING STEEL 失效
公开(公告)号：JPH0596348A
公开(公告)日：1993-04-20
申请号：JP28551791
申请日：1991-10-07
申请人： NIPPON STEEL CORP
发明人： KIYOSE AKITO , UCHIMURA MITSUO , OGIBAYASHI SHIGEAKI , MIZUKOSHI DAIJIRO , ISHII AKIO
IPC分类号： B22D11/00 , B22D11/10 , B22D41/54
摘要： PURPOSE:To reduce the clogging and the erosion of an immersion nozzle in a continuous casting of a steel and to stabilize the operation. CONSTITUTION:At the time of continuously casting the molten steel containing 0.005-0.02wt.% Ti and

8. 发明专利

JPH0550201A LIGHT ROLLING REDUCTION METHOD IN CONTINUOUS CASTING 失效
公开(公告)号：JPH0550201A
公开(公告)日：1993-03-02
申请号：JP23105591
申请日：1991-08-20
申请人： NIPPON STEEL CORP
发明人： GOTODA HIDEAKI , UCHIMURA MITSUO , MIHARA HIRONOBU
IPC分类号： B22D11/128 , B22D11/20
摘要： PURPOSE:To provide light rolling reduction method in the continuous casting to reduce the center segregation being generated at a center part of thickness in a continuously cast slab. CONSTITUTION:In the case casting speed reduces, by controlling a roll interval, the light rolling reduction range is shifted to the upstream side, and in the case the casting speed increases, the light rolling reduction range is shifted to the downstream side, and the rolling reduction speed in the light rolling reduction range is kept to the same of 0.5-1.2mm/min as before reducing or increasing the casting speed. The passing time from meniscus at the position of starting the rolling reduction is made to the time of solid phase ratio is 0.1-0.3, and at the position of ending the rolling reduction is made to the time becoming 0.5-0.7 solid phase ratio.

9. 发明专利

JPH04279264A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH04279264A
公开(公告)日：1992-10-05
申请号：JP4385791
申请日：1991-03-08
申请人： NIPPON STEEL CORP
发明人： UCHIMURA MITSUO , OGIBAYASHI SHIGEAKI , TAKAHASHI HIROMI , KUBO KATSUHIKO
IPC分类号： B22D11/20 , B22D11/12
摘要： PURPOSE:To prevent segregation of impurity elements shown at center part in thickness of a continuously cast slab, i.e., sulfur, phosphorus, manganese, etc., in the case of the steel cast slab and to obtain a uniform metal. CONSTITUTION:In the continuous casting method for molten metal drawing while executing rolling reduction to the cast slab with one or more pairs of the rolls, a segregation deteriorated cast slab developed according to reduction and stop of casting velocity is selected from the average casting velocity in the specific solidifying period range while this cast slab solidifies and solidifying period at starting rolling reduction, to select slab-rolling condition and process. Further, the solidifying period of this cast slab is quantified with center solid phase ratio, shell thickness, unsolidified thickness or unsolidified ratio.

10. 发明专利

JPH0422552A CONTINUOUS CASTING METHOD 失效
公开(公告)号：JPH0422552A
公开(公告)日：1992-01-27
申请号：JP12309490
申请日：1990-05-15
申请人： NIPPON STEEL CORP
发明人： UCHIMURA MITSUO , OGIBAYASHI SHIGEAKI , GOTODA HIDEAKI
IPC分类号： B22D11/20
摘要： PURPOSE:To stably achieve segregation improving effect under light rolling reduction by measuring the rolling reduction quantities at two or more positions of a cast slab with free rolling reduction roll at the end stage of solidification, deriving the rolling reduction quantity calculating equations for each roll and controlling roll gap and the rolling reduction force so as to make the rolling reduction quantity suitable. CONSTITUTION:By using the measured rolling reduction, (a) and (m) are decided with the equation 1 and the rolling reduction to each roll is controlled so as to become the suitable quantity based on the equations 4, 5. By using (a) and (m) calculated with the equations 1, 2, 3 after measuring and time ti, which this cast slab needs to shift from the mold meniscus to the (i)th rolling reduction roll, the rolling reduction to each roll can be quantified. The suitable rolling reduction can be obtd. by controlling the rolling reduction force and roll radius, and in the case the rolling reduction is too much, by inserting a spacer at between bearings in roll interval to limit the rolling reduction, the rolling reduction to each roll can be made to suitable, too. By this method, a steel having uniform quality without any internal crack and segregation can be stably obtd.

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