• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a plug (1) in cooperation with a bottom pour nozzle (7) in a metallurgical vessel. In order to avoid oxide formation in the liquid steel and growth of batches on the refractory material in the region of the flow control in a casting operation, the control part (3) of the plug (1) enclosing the annular control surface (31) consists of a porous gas-permeable Refractory material is formed.
    公开号:AT517239A1
    申请号:T50435/2015
    申请日:2015-05-28
    公开日:2016-12-15
    发明作者:David Ing Troiss
    申请人:Sheffield Hi-Tech Refractories Germany Gmbh；
    IPC主号:
    专利说明:

    Plug in cooperation with a bottom pour nozzle in a metallurgical vessel
    The invention relates to a plug in cooperation with a Bodenausgussdüse in a metallurgical vessel, in particular in a distribution vessel, for controlling the flow rate or casting speed of a metallic melt, optionally in a crystallizer of a continuous casting, wherein the plug substantially comprises a refractory ceramic tubular body with on the one hand a fixing means in a movable actuator or control and on the other hand or opposite the plug end a convex-conical rule part with an annular control surface, which cooperates with a control surface in the inlet part of a Bodenausgussdüse flow-determining for the melt, wherein in the hollow of the tubular body of the plug a flow control means for an inert gas which can be supplied on the basis of the definition is positioned.
    Liquid metal, especially molten steel, are often cast into slabs, bloom and the like with directly rollable cross sections usually by means of continuous casting. In this case, a controlled introduction of the liquid metal or steel from the ladle via an intermediate vessel or a distributor in the crystallizer or in the mold of a continuous casting takes place.
    A certain removal rate of the strand from the mold and thus a controlled supply of melt in the crystallizer are required and adjusted in view of a high quality of the cast strand.
    The liquid steel, which usually has a high purity or a low oxide content, is usually introduced from a heavy steelworks ladle into a distributor and from this volume-controlled in the mold.
    A flow control of the liquid metal in an introduction of the same in the
    Mold is usually done by a system by means of a plug in cooperation with a Bodenausgussdüse in the distribution vessel.
    In a controlled introduction of the liquid steel with high purity in the mold can be sucked by the suppression formed in the flowing liquid metal by splitting or due to a porosity in the refractory air, which causes a chemical reaction, in particular with the oxygen content of the air in the metal phase.
    The reaction products in the liquid steel, in particular oxides, on the one hand decisively deteriorate the degree of purity of the solidified strand, on the other hand, as is often assumed, also cause adhesion or growth of refractory material to the refractory surface in the control region of the flow cross-section of plug and / or bottom nozzle.
    It has become known a number of proposals to provide a stopper which is intended to prevent an intake of air or oxygen in the liquid steel and optionally simultaneously introduces inert gas axially into the pouring stream.
    Furthermore, it is known to design bottom pouring nozzles in particular in order to prevent adhesion and growth of material on the refractory wall and to keep the flow conditions in the liquid metal in the control range free from disadvantages such as turbulence and the like during the entire planned casting time constant.
    In general, it has to be stated that the causes and mechanisms of the formation of approaches to refractory surfaces due to liquid steel flowing along them have not been completely clarified.
    The invention has for its object to provide a plug in cooperation with a Bodenausgussdüse in a metallurgical vessel of the type mentioned, by means of which takes place in the casting operation, an oxide formation in the liquid steel, a formation or growth of lugs on the surfaces of the Refractory material in the flow control of the steel, in particular on the control surfaces, is prevented and the flow conditions in the Bodenausgussdüse until below the casting level in the mold constant, in particular turbulent remain
    This object is achieved in a plug in cooperation with a bottom spout nozzle according to the preamble of claim 1 in that the control part of the plug, including the annular control surface, is formed of a porous gas-permeable refractory material.
    The advantages achieved by the invention are essentially to be seen in the fact that inert gas, in particular argon, flows out in the entire surface region of the control part of the stopper at a suppression caused by the metal flow during the casting operation from a multiplicity of small pores and entrains the gas bubbles largely with the metal stream become. This on the one hand ensures that a flat gas outlet can form because of no approaches to the refractory surface, on the other hand increased by the large number of the volume of the bubbles targeted.
    Fears that the porosity of the control part will lead to high surface wear during casting, at least in the area of the annular control surface, have not been confirmed. Apparently, the gas flowing through a cooling of the near-surface zone of the refractory material and largely prevents material removal.
    Due to the non-stop surface of the control part and the bubbles integrated in the steel flow, the flow conditions in the system remain the same, whereby the flow energy of the introduced into the mold metal is reduced.
    Avoiding aspiration of air into the hollow of the tubular body of the plug and supply of inert gas to the control part controlled by a flow control means are well known to those skilled in the art.
    In a preferred embodiment of the invention in the stopper, the flow control means for the inert gas is at least largely gas-tightly spaced apart from the control part in the ceramic tubular body.
    As a result of this embodiment, provision of inert gas is advantageously largely centric in the inner region of the control part, whereby a uniform outflow thereof is conveyed from the surface.
    In a further development of the invention, the bottom spout nozzle has a construction and an attachment to the metallurgical vessel or to the distributor, by means of which an intake of atmospheric oxygen into the flowing metallic pouring stream is largely prevented.
    Advantageously, this achieves the effect that oxygen introduction into the liquid steel is also switched off via the bottom pouring nozzle.
    Even with temporary large throttling of the casting stream or in the case of strongly fluctuating metal quantities which are introduced into the mold during casting (stop / go operation), such suction of oxygen into the casting metal is thus eliminated.
    According to a particularly preferred embodiment of the invention, the Bodenausgussdüse a tubular body and an associated with this inlet part for melt management, which parts are fixed by means of an airtight, in particular metallic, sleeve with a flange close to the bottom of the manifold.
    Conveniently, with this embodiment of the invention, the floor spout nozzle when pouring oxygen into the liquid metal is prevented. Furthermore, metal sleeves can be prefabricated and provided in a preferred manner, which has economic advantages.
    If, according to an embodiment of the invention, the entrance part of
    Bodenausgussdüse is formed from a porous gas-permeable refractory material and in this the control surface outwardly obliquely opposite a Verteilnut for a supplied inert gas is formed, can be introduced and entrained with advantage in the inlet part large area inert gas in small bubbles in the liquid metal during casting.
    Such is in addition to other benefits at most a formation of approaches or an increase of the same on the surface of the inlet part of the Bodenausausgussdüse be prevented during the casting operation.
    Based on schematic representations, the invention will be further explained.
    They show schematically the
    Fig. 1 a manifold with a plug in cooperation with a Bodenausgussdüse
    Fig. 2 shows a plug and a Bodenausgussdüse in the flow control for the casting metal increases in section.
    1 shows a metallurgical vessel in the form of a distributor V with a refractory lining V1 and a control S of a plug 1.
    The plug 1 consists of a ceramic tube body 2 with on the one hand a determination in a control S or in a movable actuator, by which determination inert gas in the hollow 21 of the tubular body 2 is inserted and on the other hand, a convex-conical rule part. 3
    With the same longitudinal axis as the plug 1, a bottom pouring nozzle 5 is arranged in a distributor vessel V. The Bodenausgussdüse 5 consists of a tubular body 6 and an inlet part 7, which parts are used in a sleeve 9 with a flange and fixed with this in the manifold V.
    2 shows the end part of a plug 1 and an inlet part 7 of a bottom pour nozzle 5 in a distributor vessel V schematically in the region of a melt flow control.
    A plug 1 with a tubular body 2 and then with a control part 3 is consistently low in one operation.
    The tubular body 2 has in the hollow 21 thereof a flow control means 4, by means of which a pressure or a flow rate of inert gas in an interior or distribution space 32 of the control part 3 are adjustable.
    The control part 3 of the plug 2 is formed according to the invention of a porous gas-permeable refractory material and includes an annular control surface 31 on the outer surface for adjusting the flow rate of liquid metal.
    A Bodenausgussdüse 5 aligned with a stopper 1 axgleich consists of a tubular body 6 and an inlet part 7 for a melt, which parts are connected to each other by a common or simultaneous production.
    At least a portion of the tubular body 6, which is connected to the inlet part 7, is gas-tight in a sleeve 9 fixed, which sleeve 9 is mounted by means of a gas-tight bottom side of the parts V. In the wall V1 of the distributor V, the inlet part 7 is tightly inserted.
    The inlet part 7 for the melt consists according to an embodiment of the invention of a gas-permeable porous refractory material and has obliquely outwardly of the control surface 71 opposite a circumferential distribution groove 8.
    In the casting operation, the flow rate of liquid metal and thus the casting speed are determined by a distance between the control surface 31 of the plug 1 and the control surface 71 at the inlet part 7 of the bottom nozzle 5.
    In the passage between the control surfaces 31 and 71, an increased speed is formed in the liquid steel, resulting in a negative pressure in this, which is increased by the weight of the steel column in the Bodenausgussdüse to the mold level in the mold.
    Through a large-scale introduction of inert gas in small bubbles in the liquid steel while avoiding oxidation by sucked oxygen formation or growth of approaches to surfaces of the refractory material in the entire casting is prevented throughout the casting time.
    In experiments, an increase in the quality of the cast strands was observed with a reduction of the oxygen content of the material by 15 to 20 ppm.
    权利要求:
    Claims (5)
    [1]
    claims
    1. plug (1) in a cooperation with a Bodenausgussdüse (5) in a metallurgical vessel (V), in particular in a distribution vessel, for controlling the flow rate or casting speed of a metallurgical melt (S), optionally in a crystallizer of a continuous casting, wherein the Plug (1) essentially comprises a refractory ceramic tube body (2) with on the one hand a fixing means in a movable actuator or control and on the other hand or opposite the plug end a convex-conical rule part (3) with an annular control surface (31), which with a control surface (71) in the inlet part (7) of a floor spout nozzle (5) determines flow-determining for the melt, wherein in the hollow (21) of the tubular body (2) of the plug (1) a flow control means (4) is positioned for an insertable from the definition of inert gas, characterized and that the control part (3) of the plug (1) enclosing the annular control surface (31) is formed of a porous gas-permeable refractory material.
    [2]
    2. plug (1) in cooperation with a Bodenausgussdüse (5) according to claim 1, characterized in that in the plug (1) the flow control means (4) for the inert gas at least largely spaced from the control part (3) in the ceramic tubular body (2) set in the direction of laying gas-tight
    [3]
    3. Plug in cooperation with a Bodenausgussdüse (5) according to claim 1, characterized in that the Bodenausgussdüse (5) has a structure and an attachment to the metallurgical vessel (V), by means of which an intake of atmospheric oxygen in the flowing metallic casting stream through the refractory material of the pouring tube (6) is largely prevented.
    [4]
    4. Plug in cooperation with a Bodenausgussdüse (5) according to claim 3, characterized in that the Bodenausgussdüse (5) has a tubular body (6) and an associated with this inlet part (7), which parts by means of an airtight, in particular metallic, Sleeve (9) are fixed with a flange close to the bottom of the manifold (V).
    [5]
    5. Plug in cooperation with a Bodenausgussdüse (5) according to claim 4, characterized in that the inlet part (7) of the Bodenausgussdüse (5) is formed of a porous gas-permeable refractory material and in this the control surface (71) outwardly opposite obliquely a circumferential distribution groove (8) is formed for a supplied inert gas.
    类似技术:
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    同族专利:
    公开号 | 公开日
    AT517239B1|2019-07-15|
    EP3097997A1|2016-11-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CN111692881A|2020-06-28|2020-09-22|金刚新材料股份有限公司|Implanted molten ceramic material outflow device|IT974028B|1971-12-29|1974-06-20|Stoecker U Kunz Gmbh|IMPROVEMENT IN THE SPOUT ARRANGEMENTS FOR CONTAINERS CONTAINING MELTED METALS|
    EP0059805B1|1981-03-11|1985-02-13|Junichi Ato|Porous nozzle for molten metal vessel|
    GB8411596D0|1984-05-05|1984-06-13|Thor Ceramics Ltd|Stopper|
    JPS62279072A|1986-05-24|1987-12-03|Kurosaki Refract Co Ltd|Nozzle for pouring molten metal|
    US4756452A|1986-11-13|1988-07-12|Shinagawa Refractories Co., Ltd.|Molten metal pouring nozzle|
    US4791978A|1987-11-25|1988-12-20|Vesuvius Crucible Company|Gas permeable stopper rod|
    US4836508A|1988-05-03|1989-06-06|Vesuvius Crucible Company|Ladle shroud with co-pressed gas permeable ring|
    FR2650520B1|1989-08-03|1994-04-22|Vesuvius France Sa|
    FR2787045B1|1998-12-10|2001-02-09|Lorraine Laminage|REFRACTORY PIECE FOR GAS INJECTION IN A LIQUID METAL CASTING CIRCUIT|
    CN1694774A|2002-09-03|2005-11-09|维苏维尤斯·克鲁斯布公司|Gas purged nozzle|
    DE602007005493D1|2007-11-24|2010-05-06|Refractory Intellectual Prop|stopper rod|
    DE202015001370U1|2014-03-12|2015-03-03|Sheffield Hi-Tech Refractories Germany Gmbh|Plug in a distribution vessel|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50435/2015A|AT517239B1|2015-05-28|2015-05-28|Plug in cooperation with a bottom pour nozzle in a metallurgical vessel|ATA50435/2015A| AT517239B1|2015-05-28|2015-05-28|Plug in cooperation with a bottom pour nozzle in a metallurgical vessel|
    EP16171632.9A| EP3097997A1|2015-05-28|2016-05-27|Plug interacting with a base casting nozzle in a metallurgical vessel|
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