EP0219803A2 - Einrichtung und Verfahren zum Führen von Stranggussabschnitten - Google Patents

Einrichtung und Verfahren zum Führen von Stranggussabschnitten Download PDF

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Publication number
EP0219803A2
EP0219803A2 EP86114212A EP86114212A EP0219803A2 EP 0219803 A2 EP0219803 A2 EP 0219803A2 EP 86114212 A EP86114212 A EP 86114212A EP 86114212 A EP86114212 A EP 86114212A EP 0219803 A2 EP0219803 A2 EP 0219803A2
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EP
European Patent Office
Prior art keywords
gripping
cast strand
walking
strand
gripping means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86114212A
Other languages
English (en)
French (fr)
Other versions
EP0219803A3 (de
Inventor
Noriyuki Nippon Steel Corporation Kanai
Yuichi Nippon Steel Corporation Hongo
Tetsuo Nippon Steel Corporation Imi
Tokinari Nippon Steel Corporation Shirai
Hideyuki Nippon Steel Corporation Misumi
Masafumi Nippon Steel Corporation Zeze
Teiji Nippon Steel Corporation Kugimiya
Akira Nippon Steel Corporation Tsuneoka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP23009185A external-priority patent/JPS6289555A/ja
Priority claimed from JP10401186A external-priority patent/JPS62259647A/ja
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP0219803A2 publication Critical patent/EP0219803A2/de
Publication of EP0219803A3 publication Critical patent/EP0219803A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1288—Walking bar members

Definitions

  • This invention relates to an apparatus and a method for gripping, carrying forward and guiding such continuously cast sections as slabs, blooms and billets. More particularly, it relates to an apparatus and a method for guiding continuously cast sections that decrease variations in the liquid steel level in the mold when applied on the unsolified portion of the cast strand and substantially eliminate segregation and center porosity when applied on such a portion of the cast strand where solidification is nearly complete.
  • the conventional walking-bar type strand guide comprises two sets of walking-bars that alternately hold and guide the cast section. With this type of strand guide, the two sets of walking-bars are actuated to exert their gripping force on different points of the cast section.
  • the two sets of walking-bars apply different compressive gripping forces on equivalent portions of the strand relative thereto.
  • the number of walking-bars contained in each set and the area of their contact with the cast strand have not always been equal.
  • conventional walking-bar type strand guides have ordinarily been designed so that substantially equal amount of gripping force is exerted by both sets of walking-bars.
  • each set of walking-bars in a conventional strand guide has exerted a different amount of compressive gripping force on the cast strand. If pressure is applied more positively, a resulting compression in the cast strand has varied between one set of bars and the other.
  • a conventional strand guide is placed immediately under the mold, fluctuation in the liquid metal level in the mold has been caused, resulting in poor surface quality.
  • creation of segregation and center porosity has been unavoidable because of the dispersion or aggregation of unsolidified steel, in which solute concentration is high, immediately before the completion of solidification.
  • Segregations can be classified into macrosegregation and microsegregation according to their form. Both types of segregation stem from the movement of unsolidified liquid steel resulting from bulging and other irregularities caused between individual rolls by the contraction of the solidifying steel and ferrostatic pressure of the liquid steel. In order to eliminate segregation, therefore, unsolidified steel in the solidifying steel must be kept in a completely non-­mobile state. Simply preventing bulging, however, allows the creation of center porosity as well as segregation, failing to make up for solidification shrinkage.
  • the method disclosed in Japanese Patent Publication No. 16551-1984 offers a solution to the above problem, in which the portion of the cast strand near the point of complete solidification is tapered by surrounding surfaces.
  • the continuously cast strand is led to a frame containing a series of spaced guides that is provided near the point of complete solidification where thickness is reduced by 0.5 percent to 2.0 percent per meter.
  • Japanese Patent Application No. 168534-1984 Japanese Patent Publication No. 46360-1986.
  • the leading end of the continuously cast strand near the point of complete solidification is held and compressed by surrounding surfaces according to the rate of solidification and shrinkage while maintaining the surface temperature of the cast strand between the leading end thereof containing unsolidified steel and a given upstream portion of the same section closer to the mold at 600°C to 900°C.
  • This method makes the solidifying shell rigid enough to withstand the gripping by surfaces, reducing the amount of bulging to 0.05 mm maximum.
  • the object of this invention is to provide an apparatus and a method for guiding the continuously cast strand of the type that offers a solution to the aforementioned problem.
  • the cast strand is held and carried forward by means of plural sets of gripping means that are adapted to alternately grip the cast strand. Also, provision is made so that the alternately acting sets of gripping means exert an equal amount of compression force on relatively equivalent points of the section being cast. Accordingly, the compression force exerted by each of the plural sets of gripping means, whether it is just for gripping or for more positive compression, is equally distributed. It is also possible to make the product of the total area of contact times the applied pressure equal for all sets of gripping means by making equal the area of contact between the cast section and each set of gripping means or adjusting the exerted compression force according to the difference in the contact area between different sets of gripping means.
  • the equal compressive gripping force exerted by the gripping means is uniformly distributed throughout the entirety of the section being cast. This ensures that the cast strand is equally compressed by different sets of gripping means.
  • the guiding apparatus of this invention is installed immediately under the mold or at a point where the liquid steel in the cast strand still remains unsolidified, the liquid metal level in the mold always remains at rest.
  • the unsolidified steel in the solidifying shell, in which solute concentration is high is kept in a non-mobile state. Consequently, no such defects as segregation and center porosity are produced.
  • the excellent results include an increase in the yield and productivity of continuous casting and a cutdown in production costs.
  • each set of gripping means applies a required amount of compression force on a relatively equivalent portion of the continuously cast strand being gripped thereby.
  • the surface temperature of the cast strand between the leading end of the portion containing unsolidified steel and a given upstream portion closer to the mold is kept at 600°C to 900°C for a duration of time that ranges from a period in which the steel shell becomes rigid enough to ensure uniform distribution of surface tension (approximately 1 minute) to a period in which the cast strand reaches a point where effective recuperation may no longer be achieved following the completion of solidification in the surrounding gripping surfaces (approximately 7 minutes).
  • the gripping means apply uniform compressive force throughout the strand being cast, thereby surely preventing the occurrence of the defects mentioned previously.
  • a continuously cast section gripping apparatus comprises plural sets of paired gripping means disposed opposite to each other to grip the section being cast, the gripping means being adapted to be moved both along and perpendicular to the travel line of the cast section and driven forward by the cast section integrally therewith while the cast section is in grip, reciprocating drive means that causes each set of the paired gripping means to integrally make an approach run from the standby position to the starting point where the cast strand is gripped for guiding and alternately move back and forth along the travel line so that one set moves forward from said starting point to the terminal point while the other set moves backward from the terminal point to the starting point, and gripping force exerting means that independently pushes each set of gripping means toward the cast strand at the same point relative to the travel direction thereof so that the cast section is gripped at said starting point and released at said terminal point, the gripping force exerting means being adapted to exert the gripping force so that the gripping periods of the plural sets of gripping means overlap one another, and the gripping force being exerted
  • each set of gripping means can be integrally put in and out of the travel line along the plane perpendicular to the direction in which the cast strand is gripped, carried forward and guided.
  • means to detect the displacement of the paired gripping means and a controller to regulate the operation of said gripping force exerting means in accordance with the signals produced by the displacement sensing means may be provided.
  • controlling means that makes equal the gripping force exerted by the plural sets of gripping means on the basis of contact area between each set of gripping means and the cast strand may be provided, as well.
  • a continuously cast section gripping method keeps the surface temperature of the cast strand between the point where the leading end of unsolidified steel terminates and a given upstream point closer to the mold at 600°C to 900°C, maintains the above surface temperature while the cast strand is being gripped by each set of gripping means, and exerts the required gripping force on the cast strand through the gripping means at a dynamically equivalent point relative to the cast strand. It is preferable that the continuously cast strand is focibly cooled so that the surface temperature between said two points is kept at approximately 600°C to 900°C for a period of approximately 1 minute to 7 minutes.
  • Fig. 1 schematically shows an example of the travel of the continuously cast strand from the mold to a walking-bar type cast-section gripping apparatus.
  • the cast strand S is guided by a series of guide rolls 3 to a walking-bar type guiding apparatus 4.
  • Instantaneous cooling devices 5 disposed along the path of travel spray cooling water on the cast strand S immediately before the strand is gripped by the walking-bar type guiding apparatus 4, thereby keeping the surface temperature of the cast strand S at a temperature between 600°C and 900°C.
  • the surface temperature is kept in the range of 600°C to 900°C for a period time between the points at which the cast strand is gripped and released by the walking-bars, ranging from 1 minute to 7 minutes.
  • Figs. 2 to 4 show a preferred embodiment of the guiding apparatus.
  • Fig. 2 is a side elevation
  • Fig. 3 is a front view
  • Fig. 4 is a perspective view.
  • the illustrated guiding apparatus is used in an area where the cast strand S is guided horizontally.
  • a housing 7 which supports walking-members comprises vertical frames 8 erected on both sides of the travel line of the cast strand and a horizontal frame 9 that connects the two vertical frames 8 at the top thereof.
  • a hydraulic cylinder 91 for taking in and out traversing wheels 93 is provided in the lower part of each vertical frame 8, the traversing wheels 93 being connected to the cylinder rod thereof.
  • Rails 97 are laid on a floor 95 in such a manner as to cross the cast-strand travel line, with the housing 8 mounted thereon through the traversing wheels 93.
  • Each rail 97 has a rack-like teeth cut thereon, and a car (not shown) equipped with a worm gear engaging with the teeth and a motor to drive the worm gear travels thereover to put the housing 7 in and out of the cast-strand travel line.
  • the position of the housing 7 is set by means of a stopper 98 fastened at the far end of the rail 97 and a vertically retractable stopper 98 provided at a midway point of the rail 97.
  • the direction of the in-and-out motion of the guiding apparatus is not necessarily limited to horizontal.
  • the guiding apparatus may also be moved up and down, like an elevator, along veticaly disposed rails by means of a hydraulic unit.
  • the movable guiding apparatus is easy to inspect and maintain. Also, provision may be made so that the housing 7 is moved by means of a nut attached to the vertical frame 8 and a threaded shaft fastened on the floor.
  • Paired walking-members are disposed above and below the continuously cast strand S.
  • There are two sets of such paired walking-members one set consisting of outer walking-­members 11 and the other of inner walking members 12, which are supported by the housing 7 as described below.
  • the outer and inner walking-members 11 and 12 respectively have outer walking-bars 16 and inner walking-bars 17, which are the lower and upper portions of a body 14 extending toward the cast-strand travel line, adapted to press the top and bottom surfaces of the cast strand S. While the outer walking-bars 16 are four in number, the inner walking-bars 17 are three. But the area of contact between each set of walking-bars and the cast strand is designed to be equal.
  • the outer walking-bars 16 and inner walking-bars 17 are arranged to cover the entire width of the cast strand S in an alternately offsetting pattern.
  • the outer and inner top walking-bars 11 and 12 are designed to fall under their own weight.
  • a walking-member lifting device 21 is provided to the horizontal frame 9 of the housing 7.
  • the walking-member lifting device 21 has an arm 22 whose one end id pivoted to a base 24 and the other end to a spring- or hydraulically loaded supporting device 25.
  • the supporting device 25 upholds the other end of the arm 22 by means of a disk spring or the like (not shown).
  • the upper end of a downward-extending connecting rod 27 is pivoted to a midway point of the arm 22.
  • the lower end of the connecting rod 27 is pivoted to the top surface of the top outer and inner walking-members 11 and 12.
  • the outer and inner walking-members 11 and 12 can be swung back and forth (to the right and left in Fig. 2).
  • the top and bottom outer and inner walking-­members 11 and 12 are connected by means of reciprocating link mechanisms 31 and 32 to be described below. Therefore, the outer and inner walking-members 11 and 12 at the top and bottom are integrally supported by the housing 7.
  • Each of the outer and inner walking-member reciprocating link mechanisms 31 and 32 that cause the outer and inner walking-members 11 and 12 to make an approach run and a return trip has a rotary shaft 34 supported by bearings 33 fastened to the vertical frames 8 of the housing 7.
  • Four sets of the bearings 33 and rotary shafts 34 are provided to support the two each pair of the outer and inner walking-members 11 and 12 at the top and bottom.
  • To each rotary shaft 34 are fastened arms 35, with one end of a rod 36 being pivoted to the tip of each arm 35. The other end of the rod 36 is pivoted to the end surface of the body of the outer and inner walking-members 11 and 12.
  • Arms 37 and 38 are fastened to one end of the top and bottom rotary shafts 34.
  • the top and bottom arms 37 and 38 are connected to each other by means of a rod 39 pivoted thereto.
  • the housing 7 carries the tubes 43 of reciprocating hydraulic cylinders 41 and 42.
  • the rods 44 of the reciprocating hydraulic cylinders 41 and 42 are pivoted to the other end of the arms 38.
  • chucking shafts 46 for the paired outer and inner walking-members 11 and 12 at the top and bottom are fastened to the vertical frames 8 of the housing 7.
  • a wheel 49 having a bearing-supported eccentric sleeve 51 for the outer walking-member and a wheel 50 having a bearing-supported eccentric sleeve 51 for the inner walking-member is fastened to each chucking shaft 46 rotatably and concentrically attached to each chucking shaft 46 rotatably and concentrically attached to each a wheel 49 having a bearing-supported eccentric sleeve 51 for the outer walking-member and a wheel 50 having a bearing-supported eccentric sleeve 51 for the inner walking-member.
  • each compressing link mechanisms 55 and 56 each having a rotary shaft 57, for the outer and inner walking-members 11 and 12 at the top and bottom are attached to the housing 7.
  • the rotary shafts 57 for the outer walking-members are supported by bearings 58 fastened to the vertical frames 8.
  • Arms 60 are fastened to each rotary shaft 57. While one end if a rod 62 is pivoted to the tip of the arm 60, the other end of the rod 62 is pivoted to the ear 52 of said eccentric sleeve 51.
  • Fig. 5 shows the wheel 49 having the bearing-­ supported eccentric sleeve 51 in operation when the outer walking-bar 16 is compressing the cast strand S at A and D, and the wheel 50 out of operation when the inner walking-bar 17 is not compressing the cast strand S.
  • the compressing hydraulic cylinders 65 and 66 are controlled by a controller.
  • Figs. 6 and 7 are a control system diagram and a block diagram. Hydraulic fluid is supplied from a hydraulic source 73 to the compressing hydraulic cylinders 65 and 66 through a servo valve 74 that is controlled by a PI-actuated pneumatic controller 71.
  • To the controller 71 are inputted signals from a pressure gauge 76 that senses the pressure in the compressing hydraulic cylinders 65 and 66 and a walking-­bar displacement sensor 77.
  • the walking-bar displacement sensor 77 detects the displacement of the top and bottom walking-bars 16 and 17 as shown in Fig. 3 and 4.
  • a loadcell 78 to determine the compressing load is interposed between the housing 7 and the chucking shaft 46 as shown in Fig. 3.
  • the outer and inner walking-bars 16 and 17 of this preferred embodiment perform compression in an overlapped pattern as shown in Fig. 8.
  • the inner walking-bars 17 actuate the inner walking-bar compressing hydraulic cylinder 66 for chucking while the outer walking-bars are compressing the cast strand S, thereby lowering the inner walking-bars 17 through the inner walking-bar compressing link mechanism 56 as described previously.
  • the inner walking-bar reciprocating hydraulic cylinder 42 is actuated to move the inner walking-bars 17 at substantially the same speed as the casting speed so that no excessive force is exerted on the cast strand S in chucking.
  • the inner walking-bar reciprocating hydraulic cylinder 42 By the action of the inner walking-bar reciprocating hydraulic cylinder 42, the inner walking-bars 17 at the top and bottom are simultaneously accelerated through the inner walking-bar reciprocating link mechanism 32.
  • the inner walking-bars 17 are accelerated to a given speed by the time when chucking is effected. The acceleration is completed when chucking is performed. On completion of chucking, the inner walking-bars 17 move forward while gripping the cast strand S to the point of releasing, keeping pace with the travel speed of the strand.
  • the outer walking-bars 16 release the cast strand S after it has been chucked by the inner walking-bars 17.
  • the release of the cast strand S is effected through the outer walking-bar compressing link mechanism 55 by extracting the hydraulic fluid from the outer walking-­bar compressing hydraulic cylinder 65.
  • the outer walking-bar reciprocating hydraulic cylinder 41 is actuated to return the outer walking-bars 16 to a predetermined position through the outer walking-bar reciprocating link mechanism 31. Then, the chucking process of the outer walking-bars begins. This process is performed in the same manner as the chucking by the inner walking-­bars. Namely, the outer walking-bar compressing hydraulic cylinder 65 is actuated to respectively move down and up the outer walking-bars 16 at the top and bottom through the outer walking-bar compressing link mechanism 55. At the same time, the outer walking-bar reciprocating hydraulic cylinder 41 is actuated to accelerate the outer walking-bars 16 to a given speed through the outer walking-bar reciprocating link mechanism 31.
  • the release and return of the inner walking-bars 17 are also performed in the same manner as those of the outer walking-bars 16. Namely, the hydraulic fluid is extracted from the inner walking-bar compressing hydraulic cylinder 66 to cause the inner walking-bars 17 to release the cast strand S through the inner walking-­bar compressing link mechanism 56.
  • the inner walking-bar reciprocating hydraulic cylinder 42 is actuated to return the inner walking-bars 17 to a predetermined position, where they stand ready for the next operation, through the inner walking-bar reciprocating link mechanism 32.
  • a host computer (TOSHIBA TOSBAC 70G) 72 determines the desired compression force and rate on the basis of casting conditions, with the obtained results set in a controller 71.
  • the pressure corresponding to the bulging force, which is to be exerted by the outer and inner walking-bar compressing hydraulic cylinders 65 and 66, is calculated beforehand.
  • hydraulic fluid is fed from a fluid source 73 to the outer and inner walking-bar compressing hydraulic cylinders 65 and 66.
  • the point at which a pressure gauge 76 senses a pressure corresponding to said bulging force is established as the zero point.
  • the controller 71 instructs a compression rate in accordance with the elapsed time from the zero point.
  • the controller 71 translates the compression rate into the lever ratio of the outer and inner walking-bar compressing link mechanisms 55 and 56 and the amount of eccentricity of the outer and inner wheels 49 and 50 and outputs the result to a hydraulic valve 74 as a control singal of the PI operation.
  • the outer and inner walking-bar displacement sensor 77 determines the displacement or compression rate of the outer and inner walking-bars 16 and 17, feeding back the results to the controller 71.
  • the controller 71 adjusts the amount and feed rate of the hydraulic fluid that is supplied to the outer and inner walking-bar compressing hydraulic cylinders 65 and 66 through the hydraulic valve 74. Consequently, the amount of eccentricity of the outer and inner wheels 49 and 50 vary with the rod stroke of the outer and inner walking-bar compressing hydraulic cylinders 65 and 66 to attain the desired amount and rate of compression. Also, provision may be made so that the controller 71 recognizes the zero point on the basis of the signal from the loadcell 78.
  • This embodiment differs from the previous one in the following points.
  • the cast strand S is gripped by the inner walking-bars 17 that are actuated by means of inner walking-bar compressing wheels 83 that are moved up and down by the eccentric chucking shafts 47 supported by bearings 82 that are driven by an electric motor (not shown) through spindles 81.
  • Fig. 11 shows, like Fig. 5, the operating conditions of the wheels 83 and 49 of the second preferred embodiment in a state in which the inner walking-bars 17 are not compressed.
  • This embodiment automatically performs fine adjustment of compression rate using a hydraulic cylinder 85 for an automatic gauge controller of the known type and allowing for the elongation of the vertical frames 8, deflection of the bars, and other variables.
  • the hydraulic cylinder 85 is controlled based on the signals supplied from the loadcell 78.
  • the outer walking-bars 16 grip the cast strand S when the outer walking-bar compressing hydraulic cylinders 65 exert force through the outer walking-bar compressing link mechanisms 55 on the wheels 49 equipped with the bearing-supported eccentric sleeves 51 for the outer walking-bars. Fine adjustment of the outer walking-bars 16 is also performed by the hydraulic cylinder 85, as with the inner walking-bars 17.
  • the examples according to this invention produced no macro-segregation, V-segregation and center porosity.
  • the scores of semimacro-segregation were expressed by the ratios of the phosphorus concentration in the segregated phase, which is determined by a computer-­aided micro analyzer (CMA) of a known type, to the phosphorus concentration determined by ladle analysis.
  • CMA computer-­aided micro analyzer
  • the guiding apparatus may be installed immediately under the mold.
  • the walking-bars are curved along the profile of the cast strand.
  • the reciprocating and compressing hydraulic cylinders may be replaced with pneumatic cylinders of electric motors.
  • the pneumatic controller may be replaced with an electronic controller.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP86114212A 1985-10-15 1986-10-14 Einrichtung und Verfahren zum Führen von Stranggussabschnitten Withdrawn EP0219803A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP230091/85 1985-10-15
JP23009185A JPS6289555A (ja) 1985-10-15 1985-10-15 連続鋳造鋳片の案内装置
JP10401186A JPS62259647A (ja) 1986-05-06 1986-05-06 連鋳片の案内方法及び装置
JP104011/86 1986-05-06

Publications (2)

Publication Number Publication Date
EP0219803A2 true EP0219803A2 (de) 1987-04-29
EP0219803A3 EP0219803A3 (de) 1987-09-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114212A Withdrawn EP0219803A3 (de) 1985-10-15 1986-10-14 Einrichtung und Verfahren zum Führen von Stranggussabschnitten

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EP (1) EP0219803A3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0354764A3 (en) * 1988-08-08 1990-05-16 Nippon Steel Corporation Method of continuously casting strand of improved internal center segregation and center porosity

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT344346B (de) * 1975-04-30 1978-07-10 Voest Ag Einrichtung zum fuehren eines gussstranges
JPS56134055A (en) * 1980-03-25 1981-10-20 Kobe Steel Ltd Horizontal walking bar device of continuous casting machine
IT1171101B (it) * 1983-03-04 1987-06-10 Continua Int Macchina per la colata continua in curva di metalli in particolare d acciaio con falsa barra corta
JPS6146360A (ja) * 1984-08-10 1986-03-06 Nippon Steel Corp 連続鋳造スラブの中心偏析の防止方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0354764A3 (en) * 1988-08-08 1990-05-16 Nippon Steel Corporation Method of continuously casting strand of improved internal center segregation and center porosity
US5083604A (en) * 1988-08-08 1992-01-28 Nippon Steel Corporation Method for improving internal center segregation and center porosity of continuously cast strand

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Publication number Publication date
EP0219803A3 (de) 1987-09-02

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Inventor name: ZEZE, MASAFUMINIPPON STEEL CORPORATION

Inventor name: IMI, TETSUONIPPON STEEL CORPORATION

Inventor name: SHIRAI, TOKINARINIPPON STEEL CORPORATION

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