EP0982088A1 - Preventing pencil pipe defects in steel - Google Patents

Preventing pencil pipe defects in steel Download PDF

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Publication number
EP0982088A1
EP0982088A1 EP99304054A EP99304054A EP0982088A1 EP 0982088 A1 EP0982088 A1 EP 0982088A1 EP 99304054 A EP99304054 A EP 99304054A EP 99304054 A EP99304054 A EP 99304054A EP 0982088 A1 EP0982088 A1 EP 0982088A1
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EP
European Patent Office
Prior art keywords
nozzle
steel
nitrogen
passageway
containing gas
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Withdrawn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
EP99304054A
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German (de)
English (en)
French (fr)
Inventor
Gary W. Hallum
George D. Lawson
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Ltv Steel Co Inc
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Ltv Steel Co Inc
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Filing date
Publication date
Application filed by Ltv Steel Co Inc filed Critical Ltv Steel Co Inc
Publication of EP0982088A1 publication Critical patent/EP0982088A1/en
Withdrawn legal-status Critical Current

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    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/42—Features relating to gas injection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/58—Pouring-nozzles with gas injecting means

Definitions

  • the invention is directed to the field of the continuous casting of molten steel.
  • the typical refractory components are an upper tundish nozzle disposed beneath a tundish, refractory plates to control flow, and a submerged entry nozzle that extends into molten steel in the mold.
  • Aluminum oxide inclusions in the steel tend to deposit on the refractory walls of the components over time. Such buildup will choke off the bore and terminate casting unless prevented.
  • the conventional way to prevent such nozzle clogging is to deliver argon gas to the bore, through a porous refractory material of the upper tundish nozzle and an upper slide plate.
  • the argon gas bubbles exiting the refractory pores are intended to prevent aluminum oxide particles from contacting and adhering to the refractory walls and to prevent nozzle clogging.
  • the present invention can direct nitrogen-containing gas along substantially an entire passageway formed by a nozzle assembly to avoid pencil pipe defects upon high temperature annealing of resulting coils of the steel.
  • Any portions of the passageway which are not subjected to the nitrogen-containing gas such as the entry nozzle, can include insert sleeves formed of a lime-zirconia material.
  • the passageway extends between a tundish and a mold of a continuous casting apparatus.
  • the invention is particularly applicable to the use of ultra low carbon and extra low carbon steel, which are susceptible to pencil pipe defects in view of their reduced strength.
  • the invention is also applicable to the use of continuous casters having curved portions, in which the inner strand of steel is susceptible to pencil pipe defects.
  • the present invention avoids the conventional use of argon, which has been the cause of pencil pipe defects.
  • the present invention offers a valuable solution to the pencil pipe problem that has been faced by continuous casting steel producers.
  • One embodiment of the present invention is directed to a method of eliminating pencil pipe defects in steel, comprising the step of flowing molten steel through a passageway formed by: an upper tundish nozzle disposed beneath a tundish; nozzle plates for controlling flow of the molten steel; and an entry nozzle disposed between the nozzle plates and a mold, in particular, the entry nozzle being submerged in molten steel of the mold.
  • a nitrogen-containing gas is directed under predetermined gas flow conditions to portions of the passageway formed by the upper tundish nozzle, the nozzle plates and the entry nozzle. The gas flow conditions are effective to eliminate pencil pipe defects in the steel.
  • the upper tundish nozzle, the nozzle plates and the submerged entry nozzle comprise a porous refractory material through which the nitrogen-containing gas is passed.
  • the molten steel is passed through the passageway and into the mold which forms a part of a continuous casting apparatus, and especially, into arcuate mold portions of the continuous casting apparatus.
  • the gas flow conditions are effective to prevent excessive nitrogen accumulation in the steel.
  • the two-plate nozzle assembly includes a stationary upper plate and a lower, movable throttle plate. An intermediate nozzle is disposed between the throttle plate and the entry nozzle. The gas is passed to portions of the passageway formed by the upper plate.
  • the three-plate assembly includes a stationary upper plate, a movable middle throttle plate, and a stationary lower plate.
  • the submerged entry nozzle includes an upper surface that is in contact with the lower plate. The gas is passed to portions of the passageway formed by the upper plate and the lower plate.
  • the nitrogen-containing gas is directed at flow rates through the upper tundish nozzle, the upper nozzle plate, and the submerged entry nozzle in ranges of from about 8 to about 12 liters/minute (l/min), from about 2 to about 6 l/min and from about 2 to about 6 l/min, respectively.
  • the nitrogen-containing gas is directed at back pressures through the upper tundish nozzle, the upper nozzle plate, and the submerged entry nozzle in ranges of from about 10 to about 15 pounds per square inch (psi), from about 12 to about 20 psi and from about 1.5 to about 5.0 psi, respectively.
  • a third lower plate is used in the nozzle plate assembly ( i.e. , the three-plate assembly)
  • the nitrogen-containing gas is directed through it at a flow rate ranging from about 10 to about 14 l/min at a back pressure ranging from about 3 to about 6 psi.
  • Another preferred embodiment of the invention is directed to a method of eliminating pencil pipe defects in steel, comprising the step of flowing molten steel through the passageway formed by: the upper tundish nozzle disposed beneath the tundish; the nozzle plates; and the submerged entry nozzle disposed between the nozzle plates and the mold.
  • the nitrogen-containing gas is directed under predetermined gas flow conditions to portions of the passageway formed by the upper nozzle and the nozzle plates and into the passageway.
  • the molten steel is exposed to the gas which is directed under the predetermined gas flow conditions to a portion of the passageway formed by the submerged entry nozzle.
  • the molten steel may be exposed to a "slippery bore" reactive surface formed of a CaO-ZrO 2 composition, the reactive surface forming a portion of the submerged entry nozzle.
  • the nitrogen-containing gas may be directed through a porous refractory sleeve of the submerged entry nozzle (formed of the slippery bore insert material or a different porous refractory) and into the passageway. The gas flow conditions are effective to eliminate pencil pipe defects in the steel.
  • the present invention offers numerous advantages over conventional continuous casting production.
  • the inventive method employs nitrogen gas, which is relatively inexpensive. More importantly, the invention eliminates the occurrence of pencil pipe defects.
  • steel sheet such as in exposed automotive applications, in particular formed by ELC or ULC steel cast using a continuous caster with curved mold portions, will no longer suffer from pencil pipe defects.
  • Steel sheet made by hot rolling slabs of solidified steel processed according to the present invention can now be widely used in these and other exposed applications. Therefore, the present method offers a significant cost advantage to steel producers by fully utilizing the steel that is produced, and provides automotive manufacturers with a product of superior quality. All of these advantages are achieved at a molten steel throughput at the continuous caster that is the same as or faster than in conventional practices.
  • Fig. 1 refers to a nozzle assembly used in the method of the present invention designated generally at 10.
  • Molten steel M flows from a distribution vessel or tundish 12 through a passageway P formed by an upper tundish nozzle ("UTN") 14, a movable gate plate assembly 16 and a lower or submerged entry nozzle ("SEN") 18, and into a portion of a mold 20 of a continuous caster.
  • a nitrogen-containing gas depicted as “N 2 " in the drawings is directed to portions of the passageway formed by each of the UTN 14 and the gate plate assembly 16 under predetermined gas flow conditions.
  • Nitrogen-containing gas can also be directed to the SEN 18, under predetermined gas flow conditions, although injection of the nitrogen-containing gas at the SEN is optional if slippery bore inserts are employed in the SEN.
  • Annular spaces or slits 22, 24 are preferably formed in each of the UTN 14 and SEN 18 by known techniques.
  • the sizes of the annular slits are not drawn to scale, but may be enlarged somewhat for clarity of description.
  • a wax ring or paper may be used during manufacturing of the refractory component, in the location of the annular space. Upon firing of the refractory the wax ring or paper burns off, leaving the annular space.
  • the only communication of the annular spaces with the exterior of the components are passageways 26, 28 drilled through the refractory from the exterior surface of the UTN and from the exterior surface of the SEN, to the annular spaces 22, 24, respectively.
  • Gas supply conduits 30, 32 are coupled to these passageways 26, 28, respectively.
  • the nitrogen-containing gas is fed from a gas source through appropriate valves, through the gas supply conduits 30, 32, through the passageways 26, 28, into the annular spaces 22, 24 of the UTN and SEN, and through the refractory into the passageway P. Flowing the gas through the pores of the refractory causes the gas to be released as bubbles into the molten metal.
  • each of the nozzle components has a central bore that forms a portion of the passageway P which extends from the tundish to the mold.
  • molten steel is not shown in the nozzle assembly for improving the clarity of the drawings.
  • the gas supply conduits are shown schematically, and it will be appreciated that the gas supply conduits are suitably coupled to the gas passageways in a manner known to those skilled in the art.
  • the gas passageways may be drilled or formed from wax upon firing, and a steel fitting may be fixed with mortar in the passageway. A corresponding fitting of the conduit may be threaded to the fitting in the passageway.
  • the slide gate plate assembly 16 may employ two plates as shown in Figure 1.
  • the upper plate 34 of the gate plate assembly includes an upper protrusion 36 that is received by a recess 38 in a lower portion of the UTN for fixing the upper plate in place.
  • the upper plate 34 has a recess 40 that receives a porous sleeve 42 which partially forms the passageway P.
  • a gas passageway 44 In communication with the porous sleeve is a gas passageway 44 that is coupled to a gas supply conduit 46.
  • the lower plate is a throttle plate 48 with an annular opening that forms a portion of the passageway P.
  • the upper plate and the throttle plate each include a centrally located opening for forming a portion of the passageway.
  • the throttle plate 48 slides between the upper plate 34 and a flat upper surface 50 of an intermediate nozzle 52 that is secured to the SEN 18. Movement of the throttle plate blocks or permits the flow of molten metal through the passageway P.
  • a mounting plate 54 is mounted to the tundish shell. Fastened to the mounting plate is a cassette 56. Both the mounting plate and the cassette are formed of metal. The cassette is engaged below a flange 58 formed on the intermediate nozzle, to support the nozzle assembly in place.
  • the SEN includes exit ports 60 at its lower end.
  • the annular slit 24 extends in "dog-ear” fashion between the outlet ports of the SEN without communicating with the ports.
  • Figure 2 refers to a preferred nozzle assembly used in the method of the present invention designated generally at 80, where like reference numerals designate like parts through the views.
  • Molten steel M flows from a tundish 12 through a passageway P formed by an upper tundish nozzle ("UTN") 14, a movable gate plate assembly 17 and a lower or submerged entry nozzle ("SEN") 18, and into a portion of a mold 20 of a continuous caster.
  • a nitrogen-containing gas which is depicted as “N 2 " in the figure, is directed to portions of the passageway formed by each of the UTN 14 and the gate plate assembly 17 under predetermined gas flow conditions. Nitrogen-containing gas is also directed to the SEN 18, under predetermined gas flow conditions, but use of the nitrogen-containing gas at the SEN is optional if slippery bore inserts are employed in the SEN.
  • the annular spaces 22, 24 are preferably formed in each of the UTN 14 and SEN 18 by known techniques, for example, using the wax ring/paper manufacturing procedure.
  • the only communication of the annular spaces with the exterior of the components are the passageways 26, 28 drilled through the refractory from the exterior surface of the UTN and from the exterior surface of the SEN to the annular spaces 22, 24, respectively.
  • the gas supply conduits 30, 32 are coupled to these passageways 26, 28, respectively.
  • the gas is fed from a gas source through appropriate valves, through the gas supply conduits 30, 32, and the passageways 26, 28, into the annular spaces 22, 24 of the UTN and SEN, and through the refractory into the passageway P.
  • Flowing the gas through the pores of the refractory causes the gas to be released as bubbles into the molten metal.
  • Other variations of flowing the gas to the passageway may be possible such as using a plurality of small transverse passageways through the refractory and to the passageway P (not shown), but are not preferred.
  • the sliding gate assembly 17 is a three-plate system which employs an additional stationary lower plate 82 compared to the gate assembly 16 shown in Fig. 1.
  • This assembly 17 employs the similar porous upper plate 34 as in the two-plate assembly.
  • the assembly 17 also employs a similar throttle plate 48 as in the two-plate assembly.
  • the lower plate 82 includes an annular groove 84 at a lower portion thereof in communication with a flat upper surface of the SEN.
  • a gas passageway 88 is drilled into the refractory into communication with the annular groove.
  • a gas supply conduit 90 is coupled to the gas passageway 88.
  • Each of the upper plate, the throttle plate and the lower plate includes a centrally located opening that partially forms the passageway P.
  • the throttle plate 48 slides between the upper plate 24 and the lower plate 82. Movement of the throttle plate blocks or permits the flow of molten steel in the passageway P.
  • the mounting plate 54 For supporting the nozzle assembly, the mounting plate 54 is mounted to the tundish shell. Fastened to the mounting plate is the cassette 56. The cassette engages the lower surface 92 of the lower gate plate 82 to support the nozzle assembly 80 in place.
  • the vertical slit 24 formed in the SEN preferably extends to a greater height than in the SEN shown in Figure 1. All but an upper end portion of the SEN contains the slit. This feature is preferably combined with the use of the three-plate gate assembly to reduce clogging of the passageway P.
  • the UTN, the slide gate plate and the SEN of all embodiments are formed of refractory components that are designed to have a sufficiently small pore size to ensure high back pressure.
  • the UTN is formed of porous alumina or magnesium oxide.
  • the upper plate of the two-plate assembly and the upper plate of the three-plate gate assembly are formed of one of porous alumina, zirconia or magnesia.
  • a zirconia insert (not shown) extends at least on the sliding surfaces of the lower plate and the throttle plate.
  • the SEN body is formed of alumina and graphite.
  • Nozzle components suitable for use in the present invention may be formed of various compositions, and with individual portions or inserts of each component formed of different compositions, other than what is specifically shown and described herein.
  • the SEN shown in Figure 1 may have a refractory body of one composition and a porous portion located radially inward of the slit forming a portion of the bore, located in a position such as the position of the sleeve shown in Figure 3.
  • the SEN and the intermediate nozzle depending upon whether a two or three plate gate apparatus is used, may be formed with portions having different compositions than the body, which exhibit properties such as are suitable for the wear encountered by the throttle plate.
  • the UTN was supplied by TYK Refractory Co., Model No. DAS-7.
  • the three-plate gate assembly was supplied by Vesuvius Refractories and employs their upper plate with a porous mix, and throttle and lower plates.
  • the two-plate gate system may be supplied by Kurosaki Co.; this assembly may employ a porous upper plate, and a lower plate and intermediate nozzle, supplied by North American Refractories Co.
  • the SEN was supplied by Shinagawa Refractories Co., Model No. SBX-G32H6 (body mix) and SBX-G1801 (inner bore porous mix).
  • a slippery bore insert(s) (generally shown at 94) may be used in the main passageway and between the ports of the SEN.
  • the slippery bore inserts are comprised of a lime-zirconia (e.g. , CaO-ZrO 2 ) material. If the slippery bore inserts are used, the SEN preferably does not employ gas injection. When no slippery bore inserts are used as in Figs. 1 and 2, the SEN is slitted and employs gas injection.
  • the slippery bore inserts shown in Figure 3 may be used in the assembly 10 of Fig. 1 and in the assembly 80 of Fig. 2 without gas injection.
  • the slippery bore inserts may also be formed to be sufficiently porous so that the nitrogen-containing gas can be passed through them.
  • a gas passageway 96 is drilled through the SEN into communication with the slippery bore inserts 94. Coupled to the passageway is a gas conduit 98.
  • Other porous refractory inserts may also be employed in place of the slippery bore inserts 94, and are located in a position similar to that of the inserts shown in Figure 3, while employing gas injection.
  • the predetermined gas flow conditions are broadly defined herein as flow rates and/or back pressures which are effective to prevent excessive nitrogen pick-up in the steel according to conventional tolerable levels of nitrogen, to inhibit clogging of the nozzle components, and to prevent pencil pipe defects in coils of the resulting steel. Since nitrogen dissolves quickly in the molten steel, low gas flow rates minimize undesirable nitrogen pickup in the steel. Moreover, since the nitrogen dissolves in the steel, there are no bubbles which expand during annealing.
  • the nitrogen-containing gas may contain a gas or gases other than nitrogen but is preferably substantially all nitrogen gas, even more preferably, 100% nitrogen gas.
  • the gas is directed to each of the UTN, the slide gate plate assembly and the SEN (unless a slippery bore insert is used in which case the gas injection is optional). Injecting the nitrogen-containing gas to portions of the passageway formed by only one or two of the components, if a slippery bore insert is not used, is not sufficient to inhibit clogging.
  • Argon gas is preferably not utilized in the present invention since even when present in small amounts it may lead to pencil pipe defects.
  • the lime-zirconia slippery bore inserts are believed to prevent the formation and accumulation of alumina on surfaces that form the bore of the SEN.
  • the material of the slippery bore inserts is believed to be reactive. It is believed that the solid alumina which deposits in the SEN bore and ports reacts with the lime content of the inserts to form liquid calcium aluminate inclusions in the molten steel. The calcium aluminate inclusions are believed to flow with the steel into the casting mold and are not injurious to the final steel sheet product.
  • the nitrogen bubbles at the UTN and the gate plate assembly are believed to provide a scrubbing action on the surfaces of the bore to prevent deposition and accumulation of alumina. Some of the nitrogen bubbles may help to liberate the liquid calcium aluminate from the SEN and expose new lime units to react with the solid alumina particles.
  • the flow rates of nitrogen gas at the upper tundish nozzle, the upper slide gate plate and the submerged entry nozzle are, for example, in the range of: from about 8 to about 12 liters/minute (l/min), from about 2 to about 6 l/min and from about 2 to about 6 l/min, respectively.
  • Back pressures to the tundish nozzle, the upper gate plate and the SEN are, for example, in the range of: from about 10 to about 15 psi, from about 12 to about 20 psi and from about 1.5 to about 5.0 psi, respectively.
  • Graphite injection at the lower plate is preferably used to prevent clogging due to aspiration.
  • the nitrogen-containing gas flows at a rate in the range of, for example, from about 10 to about 14 l/min, with about 10 l/min being preferred.
  • the back pressure to the annular opening at the lower plate is, for example, in the range of from about 3 to about 6 psi, with about 4 psi being preferred. Back pressure is measured continuously at the passageway while nitrogen injection occurs.
  • the continuous caster is operated at throughputs up to about 4.5 tons of molten steel per minute. It is believed that under the foregoing conditions the resulting coils of steel will not exhibit any noticeable pencil pipe defects after annealing.
  • the flow rates of nitrogen gas at the upper tundish nozzle and the upper slide gate plate are, for example, in the range of: from about 8 to about 12 l/min and from about 2 to about 8 l/min, respectively.
  • Back pressures to the tundish nozzle and the upper gate plate are: about 10 to about 15 psi and about 12 to about 20 psi, respectively.
  • Graphite injection at the lower plate is used to prevent clogging due to aspiration.
  • the nitrogen-containing gas flows at a rate in the range of, for example, from about 10 to about 14 l/min, with about 10 l/min being preferred.
  • the back pressure to the annular opening at the lower plate is, for example, in the range of from about 3 to about 6 psi, with about 4 psi being preferred. It is believed that under the foregoing conditions the resulting coils of steel will not exhibit any noticeable pencil pipe defects after annealing.
  • the SEN's may be changed more frequently.
  • the SEN's are preferably changed using a commercially available SEN carriage replacement system.
  • the slitted SEN was used without slippery bore inserts in a curved continuous caster casting ELC or ULC steel.
  • the flow rates of nitrogen gas at the UTN, the upper slide gate plate, the lower slide gate plate and the SEN were: about 10 l/min, about 4 l/min, about 10 l/min and about 4 l/min, respectively.
  • Back pressures to the UTN, the upper slide gate plate, the lower slide gate plate and the SEN were: about 12 psi, about 16 psi, about 4 psi and under 5 psi, respectively.
  • the SEN had a lifetime of about 120-250 minutes (275-650 tons), due to alumina clogging of the SEN.
  • Graphite injection at the lower plate was used to prevent clogging due to aspiration.
  • the continuous caster was operated at throughputs up to about 4.5 tons of molten steel per minute.
  • the resulting coiled steel did not exhibit any noticeable pencil pipe defects after annealing.
  • a SEN supplied by TYK Refractories Co. was used without gas injection, employing CaO-ZrO 2 slippery bore inserts in the bore and around the ports designated by the trade name PA5C in a curved continuous caster casting ELC or ULC steel.
  • the flow rates of nitrogen gas at the tundish nozzle, the upper slide gate plate and the lower slide gate plate were: about 10 l/min, about 5 l/min and about 10 l/min, respectively.
  • Back pressures to the tundish nozzle, the upper gate plate and the lower gate plate were: about 12 psi, about 16 psi and about 4 psi, respectively.
  • Graphite injection at the lower plate was used to prevent clogging due to aspiration.
  • the SEN had a lifetime of about 120-250 minutes (275-650 tons), due to alumina clogging of the SEN.
  • the continuous caster was operated at throughputs up to about 4.5 tons of molten steel per minute.
  • the resulting coiled steel did not exhibit any noticeable pencil pipe defects after annealing.
  • a regular SEN was used without gas injection and without slippery bore inserts in a curved continuous caster casting ELC or ULC steel.
  • the flow rate of nitrogen gas at the UTN was 12 l/min and the flow rate of argon at the upper gate plate was 6-8 l/min.
  • Back pressures to the UTN and the upper gate plate were: 12 psi and 16 psi, respectively.
  • the SEN had a lifetime of about 200-350 minutes.
  • the continuous caster was operated at throughputs of under 3 tons of molten steel per minute. Although the SEN's used in this process had a greater life due to less clogging, coils of the resulting steel sheet exhibited pencil pipe defects after annealing, which significantly reduced the value of the steel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP99304054A 1998-07-31 1999-05-25 Preventing pencil pipe defects in steel Withdrawn EP0982088A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US126617 1993-09-24
US12661798A 1998-07-31 1998-07-31

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EP0982088A1 true EP0982088A1 (en) 2000-03-01

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EP (1) EP0982088A1 (ko)
JP (1) JP2000079453A (ko)
KR (1) KR20000011248A (ko)
AU (1) AU2251699A (ko)
CA (1) CA2268673A1 (ko)

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CN104889363A (zh) * 2015-06-03 2015-09-09 天津市航宇金属加工有限公司 一种新型铝合金液体导流装置
CN106825531A (zh) * 2017-01-18 2017-06-13 武汉精鼎科技股份有限公司 一种炼钢厂钢水连续浇铸用中间包的施工方法
CN107649672A (zh) * 2017-08-04 2018-02-02 青岛东冶耐火材料有限公司 一种板坯中间包透气上水口及其制造方法

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Publication number Priority date Publication date Assignee Title
KR100804995B1 (ko) * 2001-08-23 2008-02-20 주식회사 포스코 하부플레이트내에 배출형 유로를 갖춘 용강 재산화 방지장치
KR100843861B1 (ko) * 2001-12-22 2008-07-03 주식회사 포스코 래들과 턴디쉬 사이에서 공기흡입 방지 노즐구조

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US4583721A (en) * 1983-11-02 1986-04-22 Toshiba Ceramics Co., Ltd. Molten metal discharging device
EP0306751A1 (en) * 1987-09-07 1989-03-15 DANIELI & C. OFFICINE MECCANICHE S.p.A. Casting method for a continuous casting machine of a reduced height and consequential immersed teeming nozzle
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EP0509699A1 (en) * 1991-04-12 1992-10-21 Vesuvius Crucible Company Gas permeable well nozzle
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US4583721A (en) * 1983-11-02 1986-04-22 Toshiba Ceramics Co., Ltd. Molten metal discharging device
EP0306751A1 (en) * 1987-09-07 1989-03-15 DANIELI & C. OFFICINE MECCANICHE S.p.A. Casting method for a continuous casting machine of a reduced height and consequential immersed teeming nozzle
JPH04157052A (ja) * 1990-10-15 1992-05-29 Kawasaki Steel Corp 連続鋳造用浸漬ノズルおよびノズル詰り防止方法
EP0509699A1 (en) * 1991-04-12 1992-10-21 Vesuvius Crucible Company Gas permeable well nozzle
JPH05318059A (ja) * 1992-05-25 1993-12-03 Sumitomo Metal Ind Ltd 浸漬ノズル
JPH0839215A (ja) * 1994-07-29 1996-02-13 Toshiba Ceramics Co Ltd ガス吹ノズル
US5587101A (en) * 1995-09-29 1996-12-24 Tokyo Yogyo Kabushiki Kaisha Gas injection nozzle for pouring liquid metal

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Cited By (4)

* Cited by examiner, † Cited by third party
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CN104889363A (zh) * 2015-06-03 2015-09-09 天津市航宇金属加工有限公司 一种新型铝合金液体导流装置
CN106825531A (zh) * 2017-01-18 2017-06-13 武汉精鼎科技股份有限公司 一种炼钢厂钢水连续浇铸用中间包的施工方法
CN106825531B (zh) * 2017-01-18 2018-05-25 武汉精鼎科技股份有限公司 一种炼钢厂钢水连续浇铸用中间包的施工方法
CN107649672A (zh) * 2017-08-04 2018-02-02 青岛东冶耐火材料有限公司 一种板坯中间包透气上水口及其制造方法

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