Applying Electromagnetic Stirring Force To Molten Metal Within Mold Or Product Patents (Class 164/468)
  • Patent number: 11084271
    Abstract: This present disclosure describes a system and process for laminating a planar film sheet onto a curved surface of an optical element. One or more cuts to a planar film sheet are determined based in part on a curved surface of an optical element. The planar film sheet is cut along the determined one or more cuts to the planar film sheet to form a lamination sample. And the lamination sample has a plurality of stress relief boundaries that correspond to the determined one or more cuts to the planar film sheet. The lamination sample is laminated to the curved surface of the optical element to form a laminated coating on the optical element. And adjacent stress relief boundaries of the plurality of stress relief boundaries are in contact with each other, such that the laminated coating is a continuous film across the curved surface.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: August 10, 2021
    Assignee: Facebook Technologies, LLC
    Inventor: Jacques Gollier
  • Patent number: 11002485
    Abstract: A method of stirring and apparatus for stirring using electromagnetic stirrer units is provided. The method and apparatus are particularly useful in relation to molten metal stirring. Each stirrer unit is mounted on a moveable carriage so that it can be moved between a first location, a second location and potentially further locations. The same stirrer unit is used to provide stirring at each location, so allowing multiple locations to be stirred but only requiring a single stirrer unit to do so. The method and apparatus also provide convenient connection of air cooling to the stirrer unit.
    Type: Grant
    Filed: October 20, 2014
    Date of Patent: May 11, 2021
    Assignee: ALTEK EUROPE LIMITED
    Inventors: Alan Peel, Stephen Makepeace
  • Patent number: 10926321
    Abstract: An apparatus for continuous casting of molten material includes an elongate tube of electrically conductive material having an inner and an outer wall defining a molding cavity therein, the inner and outer walls having a first end having an inlet for receiving the molten material and a second end having an outlet for removing a solidifying billet formed from the molten material; an electrical coil with inner and outer surfaces, the electrical coil arranged to surround the outer wall of the elongate tube; and an annular channel defined by the outer wall of the elongate tube and the inner surface of the electrical coil. When pulsating current passes through the electrical coil, a counter current is induced in the elongate mold causing a repelling force between the electrical coil and the elongate mold, thereby causing inward radial flexure of the elongate mold.
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: February 23, 2021
    Assignee: 2700585 Ontario Inc.
    Inventors: Joseph Mulcahy, Navtej Saluja
  • Patent number: 10875090
    Abstract: An assembly for a metal-making process, having: a tundish, a submerged entry nozzle (SEN) configured to provide tapping of molten metal from the tundish, and an electromagnetic stirrer arranged around the SEN, the electromagnetic stirrer having a closed and integral SEN-enclosing portion provided with coils for generating a rotating electromagnetic field in the SEN, the SEN-enclosing portion providing a circumferentially closed and integral annular passage through which the SEN extends, wherein the electromagnetic stirrer is immovably mounted relative to the tundish and relative to the SEN.
    Type: Grant
    Filed: November 23, 2017
    Date of Patent: December 29, 2020
    Assignees: ABB Schweiz AG, ArcelorMittal
    Inventors: Jan-Erik Eriksson, Jean-Marie Galpin, Bengt Rydholm, Hongliang Yang, Jean-Luc Curé, Nicolas Triolet, Bruno Langlet, Fredrik Sandberg
  • Patent number: 10792730
    Abstract: Production plant of metal rods, casting machine, casting process and control method of at least three electromagnetic stirrer devices, wherein one provides at least one phase of switching between two operating configurations of the electromagnetic stirrer devices of which a first operating configuration with the generation of a rotating electromagnetic field inducing in the metallic material in the molten state a rotational motion and a second operating configuration with the generation of a linear electromagnetic field inducing in the metallic material in the molten state a linear motion.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: October 6, 2020
    Assignee: ERGOLINES LAB S.R.L.
    Inventors: Sabrina Strolego, Stefano De Monte, Stefano Spagnul, Cristiano Persi
  • Patent number: 10486228
    Abstract: A method for continuous casting of thin slabs may involve feeding a molten metal into a mold, molding a partially solidified thin-slab strand from the molten metal in the mold, reducing a flow rate of the molten metal in the partially solidified thin-slab strand by way of an electromagnetic brake positioned in a region of the mold, and removing the partially solidified thin-slab strand from the mold by way of a strand guiding system. Unsolidified parts of the partially solidified thin-slab strand may be stirred by an electromagnetic stirrer arranged underneath the mold downstream along a strand takeoff direction of the thin-slab strand. Further, a traveling electromagnetic field may be produced by the electromagnetic stirrer in a region of the thin-slab strand that is at a distance from the mold of between 20 and 7000 millimeters along the strand takeoff direction.
    Type: Grant
    Filed: April 15, 2015
    Date of Patent: November 26, 2019
    Assignees: THYSSENKRUPP STEEL EUROPE AG, THYSSENKRUPP AG
    Inventors: Eberhard Sowka, Frank Spelleken, Andy Rohe, Helmut Osterburg
  • Patent number: 9901978
    Abstract: Methods and apparatus for moving a molten metal are provided in which the electromagnetic inductor includes at least two pairs of electromagnetic pole pairs and in which a first magnetic field component is generated between one pole in a first electromagnetic pole pair and a second pole in a different electromagnetic pole pair, and in which a second magnetic field component is generated between the two poles in one or more electromagnetic pole pairs, the second magnetic field component thereby generating one or more eddy currents in the molten metal. Those eddy currents are generally parallel to the surface of the molten metal and so have greater magnitude and extent that eddy currents perpendicular to the surface. Such eddy currents provide useful additional movement to the molten metal, for instance for stirring purposes, particularly when the depth of molten metal is small.
    Type: Grant
    Filed: March 28, 2014
    Date of Patent: February 27, 2018
    Inventor: Evgeny Pavlov
  • Patent number: 9446447
    Abstract: A method and device for producing motor vehicle chassis parts is provided. The motor vehicle chassis parts can be subjected to tensile stress, compressive stress and torsion and the mechanical strength of the motor vehicle chassis parts can be adjusted over the respective cross-section. The motor vehicle chassis parts have high ductility and temperature stability and are made of an AlSiZnMg alloy by permanent mould casting.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: September 20, 2016
    Assignees: KSM CASTINGS GROUP GMBH, TRIMET ALUMINIUM SE
    Inventors: Hubert Koch, Andreas Kleine, Erhard Stark, Manikandan Loganathan, Klaus Greven, Roland Golz
  • Patent number: 8985189
    Abstract: An arrangement for a continuous casting process. The arrangement includes a vessel having a first opening for receiving molten metal in the vessel, a second opening for discharging the molten metal from the vessel, and a body extending between the first opening and the second opening, a first magnetic arrangement attached to the body, the first magnetic arrangement having a magnetic core with legs, and coils arranged around the legs, and a power system configured to provide an alternating current superimposed on a carrier current to each of the coils, each pair of alternating current and carrier current provided to a coil forming a flow control current, wherein flow control currents provided to adjacent coils are phase shifted relative each other, thereby creating a travelling magnetic field in molten metal in the vessel. A corresponding method is also presented herein.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: March 24, 2015
    Assignee: ABB AB
    Inventors: Jan-Erik Eriksson, Hongliang Yang, Boo Eriksson
  • Publication number: 20140299288
    Abstract: An arrangement for a continuous casting process. The arrangement includes a vessel having a first opening for receiving molten metal in the vessel, a second opening for discharging the molten metal from the vessel, and a body extending between the first opening and the second opening, a first magnetic arrangement attached to the body, the first magnetic arrangement having a magnetic core with legs, and coils arranged around the legs, and a power system configured to provide an alternating current superimposed on a carrier current to each of the coils, each pair of alternating current and carrier current provided to a coil forming a flow control current, wherein flow control currents provided to adjacent coils are phase shifted relative each other, thereby creating a travelling magnetic field in molten metal in the vessel. A corresponding method is also presented herein.
    Type: Application
    Filed: June 20, 2014
    Publication date: October 9, 2014
    Inventors: Jan-Erik Eriksson, Hongliang Yang, Boo Eriksson
  • Patent number: 8695684
    Abstract: The present invention discloses a method for producing an aluminum-zirconium-titanium-carbon (Al—Zr—Ti—C) intermediate alloy; the Al—Zr—Ti—C intermediate alloy comprises 0.01% to 10% Zr, 0.01% to 10% Ti, 0.01% to 0.3% C, and Al in balance; the producing method comprising the steps of: preparing commercially pure aluminum, zirconium, titanium, and graphite material according to the weight percentages of the aluminum-zirconium-titanium-carbon intermediate alloy; the graphite powder is subjected to the following treatments: being added to the aqueous solution of KF, NaF, K2ZrF6, K2TiF6 or the combination thereof, soaked for 12 to 72 hours, filtrated or centrifuged, and dried at 80° C. to 200° C. for 12 to 24 hours; melting the commercially pure aluminum and keeping it at 700° C. to 900° C. to provide aluminum liquid, in which the prepared zirconium, the titanium and the treated graphite powder are added and melted to provide an alloy solution; and keeping the alloys solution at 700° C. to 900° C.
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: April 15, 2014
    Assignee: Shenzhen Sunxing Light Alloys Materials Co., Ltd.
    Inventors: Xuemin Chen, Qingdong Ye, Yueming Yu, Jianguo Li
  • Patent number: 8672020
    Abstract: The present invention discloses a method for producing an aluminum-zirconium-carbon (Al—Zr—C) intermediate alloy; the Al—Zr—C intermediate alloy has a chemical composition of 0.01% to 10% Zr, 0.01% to 0.3% C, and Al in balance; the producing method comprising the steps of: producing commercially pure aluminum, zirconium metal, and graphite material according to the weight percentages of the aluminum-zirconium-carbon intermediate alloy; the graphite is graphite powder having an average particle size of 0.074 mm to 1 mm; and the graphite powder is subjected to the following treatments: being added to the aqueous solution of KF, NaF, K2ZrF6, K2TiF6 or the combination thereof, soaked for 12 to 72 hours, filtrated or centrifuged, and dried at 80° C. to 200° C. for 12 to 24 hours; melting the commercially pure aluminum and keeping it at 700° C. to 900° C.
    Type: Grant
    Filed: April 23, 2011
    Date of Patent: March 18, 2014
    Assignee: Shenzhen Sunxing Light Alloys Materials Co., Ltd.
    Inventors: Xuemin Chen, Qingdong Ye, Yueming Yu, Jianguo Li
  • Patent number: 8596334
    Abstract: In a method for continuously casting an extremely low carbon steel using a continuous casting machine, by adjusting the chemical components of extremely low carbon steel within a specified range by taking into account an interface tension gradient in a concentration boundary layer on a front surface of a solidified shell, and also by optimizing intensities of the DC magnetic fields applied to the upper magnetic poles and the lower magnetic poles respectively corresponding to a slab width of a slab to be casted and a casting speed, it is possible to acquire the slab having high quality not only with the small number of defects caused by the entrainment of bubbles, non-metallic inclusion and a mold flux into the molten steel.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: December 3, 2013
    Assignee: JFE Steel Corporation
    Inventors: Yuji Miki, Takeshi Murai, Hiroyuki Ohno
  • Patent number: 8418749
    Abstract: A continuous casting device for steel of the present invention includes a casting mold for casting a molten steel, a submerged entry nozzle, an electromagnetic stirring device, and an electromagnetic brake device. Further, a curved portion which is curved toward the electromagnetic stirring device is formed at least at a position where the curved portion faces the submerged entry nozzle, on each of the long side walls. Moreover, the horizontal distance between a top of the curved portion and the submerged entry nozzle in plan view is equal to or more than 35 mm and less than 50 mm.
    Type: Grant
    Filed: November 4, 2009
    Date of Patent: April 16, 2013
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Takehiko Toh, Hideaki Yamamura, Kenji Umetsu
  • Patent number: 8397793
    Abstract: A steel continuous casting method using a continuous caster that includes a pair of upper magnetic poles and a pair of lower magnetic poles is disclosed. The method comprises braking a molten steel flow with DC magnetic fields respectively applied to a pair of upper magnetic poles and a pair of lower magnetic poles while stirring the molten steel with an AC magnetic field simultaneously applied to the pair of upper magnetic poles, the strength of an AC magnetic field applied to the upper magnetic poles and strengths of DC magnetic fields applied to the upper magnetic poles and the lower magnetic poles are controlled within a particular ranges in accordance with the width of a slab to be cast.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: March 19, 2013
    Assignee: JFE Steel Corporation
    Inventors: Yuji Miki, Yasuo Kishimoto, Shunichi Kawanami
  • Patent number: 8376028
    Abstract: A steel continuous casting method using a continuous caster that includes a pair of upper magnetic poles and a pair of lower magnetic poles is disclosed. The method comprises braking a molten steel flow with the DC magnetic fields respectively applied to the pair of upper magnetic poles and the pair of lower magnetic poles while stirring a molten steel with an AC magnetic field simultaneously applied to the pair of upper magnetic poles, the strength of an AC magnetic field applied to the upper magnetic poles is set within the range of 0.060 to 0.090 T and the strengths of DC magnetic fields applied to the upper and lower magnetic poles are controlled within particular ranges in accordance with the width of the slab to be cast and the casting speed.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: February 19, 2013
    Assignee: JFE Steel Corporation
    Inventors: Yuji Miki, Yasuo Kishimoto
  • Publication number: 20130008624
    Abstract: A split stirring roll including two half-rolls aligned at a distance from one another, each incorporating a polyphase linear inductor mounted fixedly a short distance from outer tubular bodies of each half-roll to arrange between them an annular space for circulation of a cooling fluid; each inductor can generate a traveling magnetic field sliding along the width of a cast slab. The two half-rolls are mounted externally in end rolling bearings and internally in a common intermediate rolling bearing attached between them, the inductors including narrowed-diameter hollow terminal portions to rest in the three rolling bearings and communicate with a cooling circuit including the annular spaces. The split stirring roll is configured for continuous casting of extra-wide slabs and can form a preferred tool for controlled electromagnetic stirring of molten metal for optimized exchange of material between a top and bottom of a casting machine.
    Type: Application
    Filed: March 14, 2011
    Publication date: January 10, 2013
    Applicant: ROTELEC
    Inventor: Siebo Kunstreich
  • Patent number: 8336605
    Abstract: A continuous casting device includes a mould, a nozzle, and an electromagnetic stirrer provided around the nozzle above the mould, the stirrer including a core of a magnetic material that extends circumferentially around the nozzle and a plurality of windings wound around the core. The windings are wound around a cross section of the core as seen in the circumferential direction of the core.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: December 25, 2012
    Assignee: ABB AB
    Inventors: Jan-Erik Eriksson, Eleonor Olsson, Bengt Rydholm, Helmut Hackl
  • Publication number: 20120291982
    Abstract: A steel continuous casting method using a continuous caster that includes a pair of upper magnetic poles and a pair of lower magnetic poles is disclosed. The method comprises braking a molten steel flow with DC magnetic fields respectively applied to a pair of upper magnetic poles and a pair of lower magnetic poles while stirring the molten steel with an AC magnetic field simultaneously applied to the pair of upper magnetic poles, the strength of an AC magnetic field applied to the upper magnetic poles and strengths of DC magnetic fields applied to the upper magnetic poles and the lower magnetic poles are controlled within a particular ranges in accordance with the width of a slab to be cast.
    Type: Application
    Filed: March 9, 2010
    Publication date: November 22, 2012
    Applicant: JFE Steel Corporation
    Inventors: Yuji Miki, Yasuo Kishimoto, Shunichi Kawanami
  • Publication number: 20120237395
    Abstract: The invention relates to a manufacturing method for making an unwrought semi-finished product having at mid thickness a density of micropores of size greater than 90 ?m less than 50% and preferably less than 20% of the density of micropores of size greater than 90 ?m obtained by a method according to prior art. The method according to the invention comprises in particular an ultrasound treatment step for the molten metal bath in a furnace and/or a vessel using an immersed device comprising at least one ultrasound transmitter. The semi-finished products obtained according to the method of the invention are particularly advantageous for manufacturing by rolling sheets designed for the aircraft industry to produce spars, ribs, upper and lower wing skins and for manufacturing by extrusion sections designed for the aircraft industry to produce stiffeners.
    Type: Application
    Filed: February 16, 2012
    Publication date: September 20, 2012
    Applicants: Constellium France, ALCAN REHNALU
    Inventor: Philippe JARRY
  • Publication number: 20120227924
    Abstract: A steel continuous casting method using a continuous caster that includes a pair of upper magnetic poles and a pair of lower magnetic poles is disclosed. The method comprises braking a molten steel flow with the DC magnetic fields respectively applied to the pair of upper magnetic poles and the pair of lower magnetic poles while stirring a molten steel with an AC magnetic field simultaneously applied to the pair of upper magnetic poles, the strength of an AC magnetic field applied to the upper magnetic poles is set within the range of 0.060 to 0.090 T and the strengths of DC magnetic fields applied to the upper and lower magnetic poles are controlled within particular ranges in accordance with the width of the slab to be cast and the casting speed.
    Type: Application
    Filed: March 9, 2010
    Publication date: September 13, 2012
    Applicant: JFE Steel Corporation
    Inventors: Yuji Miki, Yasuo Kishimoto
  • Patent number: 8245760
    Abstract: Provided is a continuous cast slab and a manufacturing method for the same, wherein solidified layers of a cast slab having a non-solidified layer are compressed with each other during a continuous casting process to fundamentally prevent occurrence of defects, such as center segregation or porosity, which deteriorate quality of the cast slab, thereby decreasing defects. A continuous casting method for producing a cast slab by drawing molten steel from a mold includes preparing a compressing unit, and reducing at least one side of the drawn cast slab by using the compressing unit, wherein solute-enriched residual molten steel is caused to flow back in a direction opposite to a casting direction. Thus, it is possible to produce a cast slab wherein defects such as center segregation are greatly eliminated.
    Type: Grant
    Filed: November 19, 2008
    Date of Patent: August 21, 2012
    Assignee: Posco
    Inventors: Chang Hee Yim, Young Mok Won, Joong Kil Park, Sang Hum Kwon
  • Publication number: 20120199308
    Abstract: A method for casting of metal. A mold is provided including two broad sides and two narrow sides. A molten metal is introduced into the mold. There is a meniscus at a top of the molten metal. Additional molten metal is supplied into the molten metal via a casting tube below the meniscus. At least one stirrer including an iron core and a coil applied around the iron core is arranged around the mold. A length of the iron core in relation to a length of the broad side of the mold is between 50% and 80% of the length of the broad side. An upper part of the iron core is positioned from 50 mm above to 195 mm below the surface of the meniscus. A magnetic field is applied to the molten metal with the at least one stirrer to stir the molten metal.
    Type: Application
    Filed: February 22, 2012
    Publication date: August 9, 2012
    Applicant: ABB AB
    Inventors: Sten KOLLBERG, Jan-Erik Eriksson
  • Patent number: 8210239
    Abstract: A continuous casting method of molten metal using electromagnetic force to improve the cast slab surface properties and reduce the nonmetallic inclusions and bubbles trapped inside the cast slab is provided. An alternating current is run through an electromagnetic coil arranged around a casting mold so as to surround a casting space to control the meniscus shape to improve the cast slab surface properties. The discharge ports of a submerged entry nozzle are oriented upward and the direction of the discharge flow from the discharge ports is above the intersection of the casting mold short side and meniscus.
    Type: Grant
    Filed: December 3, 2007
    Date of Patent: July 3, 2012
    Assignee: Nippon Steel Corporation
    Inventors: Takehiko Toh, Masahiro Tani, Kazuhisa Tanaka, Shinichi Fukunaga
  • Patent number: 8191611
    Abstract: An electromagnetic stirrer for stirring molten steel of the liquid core in a width-wise direction of the slab includes an iron core disposed with its length-wise axis along a width-wise direction of slab, and a plurality of exciting coils wound around the outer circumference of and about a length-wise axis of the iron core, wherein two-phase or three-phase alternating current is passed through the coils. The phases of the current in the exciting coils are distributed to impart a stirring flow to the molten that includes flow from the minor sides to the center of the slab or from one minor side to the other minor side with a reversing flow at predetermined time intervals.
    Type: Grant
    Filed: September 8, 2011
    Date of Patent: June 5, 2012
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Nobuhiro Okada, Sei Hiraki, Kouji Takatani, Akihiro Yamanaka, Hidetoshi Suwa
  • Patent number: 8177925
    Abstract: In a high-tensile steel plate according to the invention, the carbon equivalent Pcm represented in Expression (1) is from 0.180% to 0.220%, the surface hardness is a Vicker's hardness of 285 or less, the ratio of a Martensite Austenite constituent in the surface layer is not more than 10%, the ratio of a mixed structure of ferrite and bainite inside beyond the surface layer is not less than 90%, the ratio of the bainite in the mixed structure is not less than 10%, the thickness of the lath of bainite is not more than 1 ?m, the length of the lath is not more than 20 ?m, and the segregation ratio as the ratio of the Mn concentration in the center segregation part relative to the Mn concentration at a part in a depth equal to ¼ of the thickness of the plate from the surface is not more than 1.3. Pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B . . . (1) where the element symbols in Expression (1) represent the % by mass of the respective elements.
    Type: Grant
    Filed: March 8, 2006
    Date of Patent: May 15, 2012
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Nobuaki Takahashi, Masahiko Hamada, Shuji Okaguchi, Akihiro Yamanaka, Ichirou Seta
  • Patent number: 8167024
    Abstract: Four distinct polyphased inductors for a travelling magnetic field and mounted with two inductors per large side on the large sides of the ingot mold, the inductors placed side by side on a same large side of the ingot mold and producing driving forces that push the molten metal, along the width of the ingot mold, both in the same direction, which is a direction opposite to that of the driving forces produced by the two inductors placed opposite on the other large side.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: May 1, 2012
    Assignee: ROTELEC
    Inventor: Siebo Kunstreich
  • Patent number: 8151867
    Abstract: A continuous casting device, including a mould, an electromagnetic device arranged outside the mould and arranged to provide an electromagnetic field acting on a melt in the mould, the electromagnetic device being supplied with electric current includes a base frequency and harmonics, and thereby providing a first electromagnetic field based on the base frequency and a second electromagnetic field based on the harmonics, and an inductive sensor, arranged at the mould for the purpose of sensing the position of a meniscus of the melt, and operating at frequencies corresponding to the harmonics. The continuous casting device includes at least one screen between the electromagnetic device and the sensor, and the screen is arranged so as to prevent the second electromagnetic field from disturbing the operation of the sensor but to permit the first electromagnetic field to act on the melt in the region of the meniscus.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: April 10, 2012
    Assignee: ABB AB
    Inventors: Boo Eriksson, Jan-Erik Eriksson, Christopher Curran
  • Patent number: 8146649
    Abstract: A method of continuously casting molten steel to produce high surface quality slab by preventing depressions and cracking. The steel is high Al steel having an Al content of 0.1% or more. High-Al molten steel is continuously cast using mold powder containing T—CaO (T—CaO presumes total Ca converted to CaO): 35 to 55%, SiO2: 10 to 30%, Al2O3: 4.0% or less (excluding 0%), MgO: 0.2 to 1.0%, Li2O: 7 to 13%, F: 7 to 13%, C: 10.5 to 14%, and inevitable impurities; and satisfying: 1.6?[T—CaO]/[SiO2]?5 and 0.2?[Li2O]/[SiO2]?1.1. The method is performed by controlling the molten steel surface level fluctuation speed in the mold; the pouring angle of the molten steel in the width direction of the mold; the stroke in the amplitude; and the negative strip time tN as defined.
    Type: Grant
    Filed: April 23, 2007
    Date of Patent: April 3, 2012
    Assignee: Kobe Steel, Ltd.
    Inventors: Takashi Miyake, Hitoshi Nakata, Tsuyoshi Mimura, Tomoaki Omoto, Yukimasa Iwamoto
  • Patent number: 8109320
    Abstract: In a method and apparatus for the continuous casting of preliminary steel sections, the liquid or molten steel is introduced substantially vertically into an open-ended die. The cross section of the cavity of the die is made up of a web part and one or more flange parts, for example, such as in preliminary double-T sections. The liquid core of the strand of the preliminary section is set in agitating motions transversely to the direction of continuous casting by selectively using electromagnetically-induced forces in the regions of the flange parts and/or of the web part. The agitating motions have the effect of exchanging the liquid steel in the molten crater of the strand of the preliminary section in and between flange parts and the web part.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: February 7, 2012
    Assignee: Concast AG
    Inventors: Franz Kawa, Paul Mueller
  • Patent number: 8048197
    Abstract: The present invention provides a low carbon steel sheet and a low carbon steel slab on which formation of surface defects can be surely prevented by preventing aggregation of inclusions in the molten steel and finely dispersing inclusions in the steel sheet or slab, and a process for producing the steel sheet and slab. The present invention provides a process comprising the steps of decarburizing a molten steel so as to produce a carbon concentration of up to 0.01% by mass, pre-deoxidizing the molten steel by adding Al thereto so as to produce a dissolved oxygen concentration from 0.01 to 0.04% by mass, adding thereto Ti and at least La and/or Ce, and casting the molten steel, and a steel sheet and a steel slab obtained by the process.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: November 1, 2011
    Assignee: Nippon Steel Corporation
    Inventors: Katsuhiro Sasai, Wataru Ohashi, Tooru Matsumiya, Yoshiaki Kimura, Junji Nakashima
  • Patent number: 8047265
    Abstract: The present invention provides a previously unattainable compact and high thrust electromagnetic stirrer coil, that is, an electromagnetic stirrer coil for stirring molten steel in a mold by electromagnetic force, in which electromagnetic stirrer coil a space factor of the yoke sectional area (?) with respect to an inside area in a vertical cross-section of said electromagnetic stirrer coil is 0.5 to 0.9 and a yoke width B is 100 mm to 300 mm. Preferably, a magnetomotive force F of said electromagnetic stirrer coil divided by the yoke width B, that is, a value of F/B, is 800 kAT/m or more.
    Type: Grant
    Filed: May 5, 2011
    Date of Patent: November 1, 2011
    Assignee: Nippon Steel Corporation
    Inventors: Hiroshi Harada, Akinori Wakagi, Tomohiro Konno, Keisuke Fujisaki, Ryu Hirayama, Sumio Matsumori, Yasuji Tomizawa
  • Patent number: 8033319
    Abstract: Disclosed is a continuous casting in which an electromagnetic stirrer is installed upstream, in the casting direction, of the reduction rolling position of a slab, and in which a slab with a liquid core is reduced in thickness, wherein by imparting a collision flow forming-type stirring and a uni-directional alternating flow forming-type stirring, molten steel with concentrated segregation elements is stirred and diffused in a width-wise direction of slab, whereby a slab stabilized in center segregation qualities can be produced over long-time casting operation. Since the stirring flowing pattern is selectively imparted by means of the same electromagnetic stirrer, it is effective to decrease facility and equipment costs, improve maintainability, and extensively cope with various casting conditions.
    Type: Grant
    Filed: October 27, 2010
    Date of Patent: October 11, 2011
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Nobuhiro Okada, Sei Hiraki, Kouji Takatani, Akihiro Yamanaka, Hidetoshi Suwa
  • Patent number: 8011417
    Abstract: A process for continuous casting of slabs or other metal products of elongate cross section, for example made of steel, in which a molten metal is poured into a cooled mold, and the externally solidified product is continuously extracted from the mold and guided in a secondary cooling zone downstream of the mold. To obtain a cast product exhibiting predominantly equiaxed solidification, the product extracted from the mold is subjected to electromagnetic stirring in segment zero of the secondary cooling zone by at least two stirrer-rolls incorporated into the segment zero.
    Type: Grant
    Filed: July 7, 2006
    Date of Patent: September 6, 2011
    Assignee: Rotelec
    Inventors: Siebo Kunstreich, Dominique Yves
  • Patent number: 7975753
    Abstract: Method for controlling a flow of molten steel in a mould by applying at least one magnetic field to the molten steel in a continuous slab casting machine. Controlling a molten steel flow velocity on a molten steel bath surface to a predetermined molten steel flow velocity by applying a static magnetic field to impart a stabilizing and braking force to a discharge flow from an immersion nozzle when the molten steel flow velocity on the meniscus is higher than a mould powder entrainment critical flow velocity. Controlling the molten steel flow velocity on the meniscus to a range of from an inclusion adherence critical flow velocity or more to a mould powder entrainment critical flow velocity or less by applying a shifting magnetic field to increase the molten steel flow when the molten steel flow velocity on the meniscus is lower than the inclusion-adherence critical flow velocity.
    Type: Grant
    Filed: January 6, 2009
    Date of Patent: July 12, 2011
    Assignee: ABB AB
    Inventors: Anders Lehman, Helmut Hackl, Jan-Erik Eriksson, Olof Sjoden
  • Patent number: 7938166
    Abstract: In the continuous casting of flat metal products with a submerged nozzle having lateral outlets, a mold is equipped on each of its long sides with a pair of linear inductors that generate a magnetic field that travels horizontally over a width of the long sides and are placed on sides of the nozzle. The inductors are mounted in pairs to slide vertically over the height of the mold, and by being moved, pass from a low stirring position, located level with the outlets of the nozzle, to a high stirring position, located level with a meniscus of the liquid metal in the mold, and vice versa. Also, on passing from one position to the other, the connections for the inductors to the phases of the power supply are modified to reverse the direction of travel of the magnetic field of only one of the two inductors of each pair.
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: May 10, 2011
    Assignee: Rotelec
    Inventor: Siebo Kunstreich
  • Publication number: 20110094703
    Abstract: The invention provides a method of continuous casting for producing a slab excellent in surface quality by preventing formation of depressions and occurrence of cracking of a slab even in the case of producing a high Al steel having an Al content of 0.1% or more by continuous casting. At the time of continuous casting of a high-Al molten steel containing prescribed chemical components by using a mold powder, a powder containing T—CaO: 35 to 55%, SiO2: 10 to 30%, Al2O3: 4.0% or less (excluding 0%), MgO: 0.2 to 1.0%, Li2O: 7 to 13%, F: 7 to 13%, C: 10.5 to 14%, and inevitable impurities and satisfying 1.6?[T—CaO]/[SiO2]?5 and 0.2?[Li2O]/[SiO2]?1.1 is used as the mold powder, and operation is carried out while controlling the conditions such as the molten steel surface level fluctuation speed in the mold; the pouring angle of the molten steel in the width direction of the mold; the stroke in the amplitude; and the negative strip time tN defined by a prescribed relational expression.
    Type: Application
    Filed: April 23, 2007
    Publication date: April 28, 2011
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO,
    Inventors: Takashi Miyake, Hitoshi Nakata, Tsuyoshi Mimura, Tomoaki Omoto, Yukimasa Iwamoto
  • Publication number: 20110036533
    Abstract: Disclosed is a continuous casting in which an electromagnetic stirrer is installed upstream, in the casting direction, of the reduction rolling position of a slab, and in which a slab with a liquid core is reduced in thickness, wherein by imparting a collision flow forming-type stirring and a uni-directional alternating flow forming-type stirring, molten steel with concentrated segregation elements is stirred and diffused in a width-wise direction of slab, whereby a slab stabilized in center segregation qualities can be produced over long-time casting operation. Since the stirring flowing pattern is selectively imparted by means of the same electromagnetic stirrer, it is effective to decrease facility and equipment costs, improve maintainability, and extensively cope with various casting conditions.
    Type: Application
    Filed: October 27, 2010
    Publication date: February 17, 2011
    Applicant: SUMITOMO METAL INDUSTRIES, LTD.
    Inventors: Nobuhiro Okada, Sei Hiraki, Kouji Takatani, Akihiro Yamanaka, Hidetoshi Suwa
  • Publication number: 20100296960
    Abstract: The present invention relates to a continuous cast slab and a manufacturing method for the same, wherein solidified layers of a cast slab having a non-solidified layer are compressed with each other during a continuous casting process to fundamentally prevent occurrence of defects, such as center segregation or porosity, which deteriorate quality of the cast slab, thereby decreasing defects. A continuous casting method for producing a cast slab by drawing molten steel from a mold includes preparing a compressing unit, and reducing at least one side of the drawn cast slab by means of the compressing unit, wherein solute-enriched residual molten steel is caused to flow back in a direction opposite to a casting direction. Thus, it is possible to produce a cast slab wherein defects such as center segregation are greatly eliminated.
    Type: Application
    Filed: November 19, 2008
    Publication date: November 25, 2010
    Inventors: Chang Hee Yim, Young Mok Won, Joong Kil Park, Sang Hum Kwon
  • Publication number: 20100263822
    Abstract: Four distinct polyphased inductors (10a, 10b, 10c, 10d) for a travelling magnetic field and mounted with two inductors per large side (12, 12?) on the large sides of the ingot mould, the inductors (10a, 10b) placed side by side on a same large side (12) of the ingot mould and producing driving forces that push the molten metal, along the width of the ingot mould, both in the same direction, which is a direction opposite to that of the driving forces produced by the two inductors (10c, 10d) placed opposite on the other large side (12?), the intensity of the driving forces are adjusted in a differential manner between them such that in proximity to a large side, if there the flow of the metal is higher “towards the interior” than “towards the exterior”, greater intensities are applied to the two forces that push the metal “towards the exterior”, and conversely, if said flow is less strong “towards the interior” than “towards the exterior”, greater forces are applied to the forces that push the metal “towards th
    Type: Application
    Filed: December 17, 2007
    Publication date: October 21, 2010
    Applicant: ROTELEC
    Inventor: Siebo Kunstreich
  • Patent number: 7784527
    Abstract: The present invention provides a continuous casting method of steel preventing alumina and other nonmetallic inclusions becoming causes of slivers and argon bubbles becoming causes of blowholes from being entrained and thereby enabling the production of a cast slab superior in surface and internal quality, that is, one giving an inside bore 21 of an immersion nozzle 21 a horizontal sectional shape of an elliptical shape or oblong shape with a length ratio DL/DS of that long axis DL and short axis DS of 1.2 to 3.8, making a direction of that long axis substantially parallel to a long side direction of the casting mold 3, and making the sliding direction of the sliding nozzle 1 a direction perpendicular to said long axis to supply the molten steel in the casting mold 3. Note that a ratio S1/S0 of a sectional area S1 at a smallest sectional area part 23 of the inside bore 21 and a sectional area S0 of a nozzle hole 11 of the sliding nozzle 1 is made 0.5 to 0.
    Type: Grant
    Filed: September 5, 2006
    Date of Patent: August 31, 2010
    Assignee: Nippon Steel Corporation
    Inventors: Toshiaki Mizoguchi, Masanobu Hayakawa, Yoshiaki Suematsu, Akira Mikasa
  • Patent number: 7762311
    Abstract: A method for controlling a flow of molten steel in a slab continuous casting machine including controlling a molten steel flow velocity on a molten steel bath surface to a predetermined flow velocity by applying a shifting magnetic field; controlling the molten steel flow velocity on the molten steel bath surface from an inclusion-adherence critical flow velocity or more to a mold-powder entrainment critical flow velocity or less by applying a shifting magnetic field; and controlling the molten steel flow velocity on the molten steel bath surface from the inclusion-adherence critical flow velocity or more to the mold-powder entrainment critical flow velocity or less by applying a shifting magnetic field.
    Type: Grant
    Filed: March 16, 2009
    Date of Patent: July 27, 2010
    Assignee: JFE Steel Corporation
    Inventors: Jun Kubota, Seishl Mizuoka, Tsuneo Kondo
  • Patent number: 7735544
    Abstract: A method and an apparatus are provided for electromagnetic stirring during a continuous casting process, especially for casting a billet and bloom of medium and high carbon steels. The method and apparatus provide a higher surface quality of the ingot, reduce the entrapping of nonmetallic inclusions into the ingot, and suppress issues regarding central segregation and central porosity. The method provides an improvement in the stirring process from the meniscus to the crater end—and relates to in-mold stirring and stirring in a zone of secondary cooling and up to the crater end. The in-mold stirring is geared towards the suppression of meniscus disturbance, for submerged casting, in particular, the reducing of helical and axial velocity components of the molten steel, the lowering of the initial solidification point to avoid the touching of a shell edge with the slag ring, and a decrease of oscillation marks.
    Type: Grant
    Filed: March 16, 2009
    Date of Patent: June 15, 2010
    Inventors: Anastasia Kolesnichenko, Anatoly Kolesnichenko, Viktoriia V. Buriak
  • Patent number: 7661456
    Abstract: Apparatus and methods are provided for eliminating axial porosity accompanied by impurity segregation arising at bulk crystallization of the axial zone of the liquid core of a continuous ingot.
    Type: Grant
    Filed: January 25, 2007
    Date of Patent: February 16, 2010
    Assignee: Energetics Technologies, LLC
    Inventors: Irving I. Dardik, Ephim G. Golbraikh, Shaul L. Lesin, Arkady K. Kapusta, Boris M. Mikhailovich, Michael Khavkin, Herman D. Branover
  • Publication number: 20090297872
    Abstract: In a high-tensile steel plate according to the invention, the carbon equivalent Pcm represented in Expression (1) is from 0.180% to 0.220%, the surface hardness is a Vicker's hardness of 285 or less, the ratio of a Martensite Austenite constituent in the surface layer is not more than 10%, the ratio of a mixed structure of ferrite and bainite inside beyond the surface layer is not less than 90%, the ratio of the bainite in the mixed structure is not less than 10%, the thickness of the lath of bainite is not more than 1 ?m, the length of the lath is not more than 20 ?m, and the segregation ratio as the ratio of the Mn concentration in the center segregation part relative to the Mn concentration at a part in a depth equal to ¼ of the thickness of the plate from the surface is not more than 1.3. Pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B . . . (1) where the element symbols in Expression (1) represent the % by mass of the respective elements.
    Type: Application
    Filed: March 8, 2006
    Publication date: December 3, 2009
    Applicant: SUMITOMO METAL INDUSTRIES, LTD.
    Inventors: Nobuaki Takahashi, Masahiko Hamada, Shuji Okaguchi, Akihiro Yamanaka, Ichirou Seta
  • Publication number: 20090294091
    Abstract: A continuous casting device includes a mould, a nozzle, and an electromagnetic stirrer provided around the nozzle above the mould, the stirrer including a core of a magnetic material that extends circumferentially around the nozzle and a plurality of windings wound around the core. The windings are wound around a cross section of the core as seen in the circumferential direction of the core.
    Type: Application
    Filed: May 27, 2009
    Publication date: December 3, 2009
    Inventors: Jan-Erik Eriksson, Bengt Rydholm, Eleonor Olsson, Helmut Hackl
  • Publication number: 20090266505
    Abstract: The present invention provides a continuous casting method of steel preventing alumina and other nonmetallic inclusions becoming causes of slivers and argon bubbles becoming causes of blowholes from being entrained and thereby enabling the production of a cast slab superior in surface and internal quality, that is, one giving an inside bore 21 of an immersion nozzle 21 a horizontal sectional shape of an elliptical shape or oblong shape with a length ratio DL/DS of that long axis DL and short axis DS of 1.2 to 3.8, making a direction of that long axis substantially parallel to a long side direction of the casting mold 3, and making the sliding direction of the sliding nozzle 1 a direction perpendicular to said long axis to supply the molten steel in the casting mold 3. Note that a ratio S1/S0 of a sectional area Si at a smallest sectional area part 23 of the inside bore 21 and a sectional area S0 of a nozzle hole 11 of the sliding nozzle 1 is made 0.5 to 0.
    Type: Application
    Filed: September 5, 2006
    Publication date: October 29, 2009
    Inventors: Toshiaki Mizoguchi, Masanobu Hayakawa, Yoshiaki Suematsu, Akira Mikasa
  • Publication number: 20090229783
    Abstract: A method and an apparatus are provided for electromagnetic stirring during a continuous casting process, especially for casting a billet and bloom of medium and high carbon steels. The method and apparatus provide a higher surface quality of the ingot, reduce the entrapping of nonmetallic inclusions into the ingot, and suppress issues regarding central segregation and central porosity. The method provides an improvement in the stirring process from the meniscus to the crater end—and relates to in-mold stirring and stirring in a zone of secondary cooling and up to the crater end. The in-mold stirring is geared towards the suppression of meniscus disturbance, for submerged casting, in particular, the reducing of helical and axial velocity components of the molten steel, the lowering of the initial solidification point to avoid the touching of a shell edge with the slag ring, and a decrease of oscillation marks.
    Type: Application
    Filed: March 16, 2009
    Publication date: September 17, 2009
    Inventors: Anastasia Kolesnichenko, Anatoly F. Kolesnichenko, Viktoriia V. Buriak
  • Publication number: 20090183851
    Abstract: A process for continuous casting of slabs or other metal products of elongate cross section, for example made of steel, in which a molten metal is poured into a cooled mold, and the externally solidified product is continuously extracted from the mold and guided in a secondary cooling zone downstream of the mold. To obtain a cast product exhibiting predominantly equiaxed solidification, the product extracted from the mold is subjected to electromagnetic stirring in segment zero of the secondary cooling zone by at least two stirrer-rolls incorporated into the segment zero.
    Type: Application
    Filed: July 7, 2006
    Publication date: July 23, 2009
    Applicant: ROTELEC
    Inventors: Siebo Kunstreich, Dominique Yves
  • Patent number: 7540317
    Abstract: When a molten steel flow velocity (u) on a bath surface is higher than a mold-powder entrainment critical flow velocity of 0.32 m/sec, the molten steel flow velocity (u) is controlled to a predetermined molten steel flow velocity by applying a shifting magnetic field to impart a braking force to a discharge flow from an immersion nozzle. When the molten steel flow velocity (u) is lower than an inclusion-adherence critical flow velocity of 0.20 m/sec and is higher than or equal to a bath-surface skinning critical flow velocity of 0.10 m/sec, the molten steel flow velocity (u) is controlled to the range of 0.20-0.32 m/sec by applying a shifting magnetic field to rotate the intra-mold molten steel in a horizontal direction. When the molten steel flow velocity (u) is lower than the inclusion-adherence critical flow velocity, the molten steel flow velocity (u) is controlled to the range of 0.20-0.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: June 2, 2009
    Assignee: JFE Steel Corporation
    Inventors: Jun Kubota, Seishi Mizuoka, Tsuneo Kondo