CA1229715A - Method and apparatus for pouring molten metal in a neutral atmosphere - Google Patents
Method and apparatus for pouring molten metal in a neutral atmosphereInfo
- Publication number
- CA1229715A CA1229715A CA000480479A CA480479A CA1229715A CA 1229715 A CA1229715 A CA 1229715A CA 000480479 A CA000480479 A CA 000480479A CA 480479 A CA480479 A CA 480479A CA 1229715 A CA1229715 A CA 1229715A
- Authority
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- Canada
- Prior art keywords
- closure
- opening
- tundish
- nozzle
- molten steel
- 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.)
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A molten metal receiving vessel having substantially vertically standing walls is provided with a closure closing said vessel to the atmosphere and directing molten metal into said closed vessel; the closure includes a hori-zontally disposed member formed of a low thermal conductivity refractory material having an opening therein, the opening being positioned for registry with a nozzle of a ladle, a heat resistant air lock gasket engages the closure around the opening and the nozzle, the closure being movable from a first position on a lip portion of the vessel to a second position in the vessel engaging molten metal therein and arranged to float on the molten metal when the level of the molten metal falls below said second position.
A molten metal receiving vessel having substantially vertically standing walls is provided with a closure closing said vessel to the atmosphere and directing molten metal into said closed vessel; the closure includes a hori-zontally disposed member formed of a low thermal conductivity refractory material having an opening therein, the opening being positioned for registry with a nozzle of a ladle, a heat resistant air lock gasket engages the closure around the opening and the nozzle, the closure being movable from a first position on a lip portion of the vessel to a second position in the vessel engaging molten metal therein and arranged to float on the molten metal when the level of the molten metal falls below said second position.
Description
~læ~7~
~IETIIOD AND ~PPA~'l`US FOR POURING MOLTEN MET~L
IN ~ N~UTR~L ~TMOSPIIER~
Background o r the Irrvention Technical Field:
This invention relates to a method and apparatus for pour:ing molten metal into a receiving vessel while excluding atmospheric air there-from.
~escrLptlon of the PrLor Art:
No prior art tnethods or devices are known whereby a relative~y simple and inexperlsi.ve closure with or without a pouring sleeve posi-tioned there-through enable a receiving vessel to be charged with an inert gas and structurally preven-t the entrance of atmospheric air thereinto.
Summary of the Inven-tion ~ metlhod and apparatus :Eor pouring molten metal in a neutral atmosphere are disclosed wherein sl.mpLe and :relat-.Lvely inexpensLve apparatus placed on a receiving vessel :eo:rms a closed passageway from a ladle,converter or simiLar source of molten metal to the receiving vessel and is moved to a position on the molten metal in the receiving vessel when -the same is filled to main-tain the closure with respect to.the atmosphere ~LZ297~;
while the mol-ten me-tal is discharged :Erom the receiving vessel.
~ powdered hot top compound may be and preferably is applied to the surface o-E the mol-ten metal to insure sealing of the same wi-th respec-t to -the atmosphere and -the movable closure and closed passageway.
Description of the Drawings Figure 1 is a fragmentary vertical section through a portiorl of an ingot mold and illustra-ting -the a-tmosphere excludlng apparatus in a firs-t position;
Figure 2 is a ver-tical sectional view similar to Figure 1 showing the atmospheric excluding apparatus in a second position in an ingot mold;
Figure 3 is a top plan view o~ the apparatus seen in Fi.gure 1~
L5 Figure 4 i.s a perspec-tive view showing the apparatus of Figures ~L and 3;
Figure 5 is a fragmentary vertical section through a por-tion of an ingot mold and a modified atmospher;.c excluding apparatus in a first position thereon;
Figure 6 is a vertical sectional view similar -to Figure 5 ' ~
~LZX9'7 3L~i showing -the atmospheric excluding apparatus in a second position in the ingot mold; and ~ igure 7 is a perspective view on an enlarged scale showing a ceramic sleeve which is also seen in ~igures 5 and 6 of -the drawings.
Description oi the Preeerred Embodimen-t By re:Eerring to the drawings and Figure 1 in parti.cular a :Eragmetltary view o:E -the upper por-tion oE a receivin~ vessel 10 which may be an ingo-t mold or a -trumpet -Cunnel O-e a bottom poured ingot mold or a tundish box -Eor a continuous caster will be seen -to be substantially filled wi-th molten metal M which has been introduced in-to -the receiving vessel 10 ~rom a ladle 11 or o-ther source o:E molten metal. The molten metal M is introduced in-to the rece:Lving vesse] 10 through an opening 12 located in a closure 13 positioned on the open upper end o:E the receiving vessel 10. The closure 13 may be a sheet-like sec-tion o~ insu:Lating fiber board or the like. The opening 12 in the closure 13 is fo:rmed subs-tantially centrally -thereoE
as may be seen by reEerring to Figu:re 4 o-E the drawings.
Mol.ten metal is introduced into the opening 12 of the closure ~L229~7~;
13 from the ladle or other source Oe mo:Lten meta]. by way o:E a -tubu].c~r nozzle 1~ the lower end po:r-tion Oe which is providecl with an air lock gaske-t 15 Iormed Oe suitable refractory fiber materials and the like which is of an overall tapered shape and thereby capable of registering in the opening 12 in the closure 13 and -forming an airtigh-t closure.
A pair O e pipes 16 and 17 may be positioned through the horizontal wal.l of -the closu:re 13 the pipe 16 being connected by a Ilexible hose 18 wi-th a source of inert gas such as argon and the pi.pe 17 provides a sui-table lead-in for an alloy wire 19 which can be introduced into -the molten me-tal therethrough as desired.
Still referring to Figure 1 of the drawings, i-t will be seen -that the :Lower sur-face of -the closure 13 Oe insula-tillg fiber board or the like is provided with fold or score lines 20 defin:Lng a rectangular o:r o-ther shape sLightly smaller than the inner rectangular or other shape oe the rec.eiving vessel 1() and by :reeerring to Fi.gure 3 of -the drawings, a top plan view of -the appara-tus enabling the pouring of molten metal in a neutral atmosphere will be seen to include broken ~Z~7~S
e representatiorls Oe the eolcl lines or score l:ines 20 together with diagonal extensions thereof at -the -four corners of -the closure 13 and connecting with -the cu-t ou-t corners thereof as indicated by the numerals 21.
At such time as the receiving vessel 10 is filled to a desired level and the inert gas flow con-tinues, an ed~e por-tion 22 oE ~he c].osure 13 and/or -the ladle 11 and nozzle 1~ is lifted atld a covering coa-ting o~ powdered ho-t -top compound 23, as knowrl in the art, is applied to the surface of the mol-ten metal.
10. The horizon-tal sheet-like sec-tion o-f -the cl.osure 13 of insulating :Eiber board or -the like is -then pushed downwardly so as to bend the longi-tudinal edge portions 22 thereof in angular relation -there-to and form four angularly disposed edge sections resembl.ing wipers, each attached to the sheet-l.ike closure 13 o~ insulating ~5 eiber board or the like and each continuously engaging the inner walls oe the receiving vessel 10 so as to :eorm an a:irtight closure.
,Vhen -the horizon-tal sectlon of the closure 1~ is pushed downwardly to contact either the mol-ten metal M or the powdered hot top compound floating thereon, a secondary closure, Z,C.3~
no-t shown, may be placed in the opening 1" to ef-fectively seal the sur-face o:f the molten metal in the vessel 15. At the same -time the pipes 16 and 17 may be disconnected -from -their respec-tive sources of gas or metal antl/or removed comp]etely and as the molten metal ~ in the receiving vessel 10 is fed -therefrom, as :Eor example into a con-tinuous caster, the entire sealing apparatus descencls w~th the level o:E the molten metal M and maintains the atmospheric seal.
In orde:r -to insure the existence of a desirabJe neutral atmosphere in the receiving vessel. 10 when the first mol-ten me-tal is poured therein, a smal] quantity of hexamethylene, also known as cyclohexane, or any o-ther similar readily vaporizab:l.e liquid having sim-ilar properties is introduced :Lnto the receiving vessel 10 Wtlell the closure apparatus is first instal].ed so that the introduction Oe the f-irst molten metal into the receiving vessel will immediatel.y vapo-rlze the same and create a suitable gaseous environment that will expel all of the usual atmosphereic air from -the recei.ving vessel 10 and thus prevent contamination by the reoxiclation of the molten metal and the undesirable products -thereof.
.... .... . . . . , ~ :
~ ZZ~37~
?~lodifications in the apparatus ~or pouring molten me-tal in a neutra~ atmosphlsre will occur to those skilled in the art and one such modi:eication may comprise -the addition oE exothermic material as known.in the art into the closure 13 o-E insu]ating ~iber board or the like and/or a-ttaching sections of exothermic materlal 23A to the lower sur-faces o:f the closure 13 oE insulating E:Lt)t?r board or the l:lke so that the reac-tion o-E the exothermic material will add additional heat to the metal in the receiving vessel and avoid -the usual piping probl.ems -that occur, :Eor examp~e when mol.ten metal soldiEies in an ingo-t mold or the like.
Another modi-Eica-tion comprises the use O e a ceramic sleeve
~IETIIOD AND ~PPA~'l`US FOR POURING MOLTEN MET~L
IN ~ N~UTR~L ~TMOSPIIER~
Background o r the Irrvention Technical Field:
This invention relates to a method and apparatus for pour:ing molten metal into a receiving vessel while excluding atmospheric air there-from.
~escrLptlon of the PrLor Art:
No prior art tnethods or devices are known whereby a relative~y simple and inexperlsi.ve closure with or without a pouring sleeve posi-tioned there-through enable a receiving vessel to be charged with an inert gas and structurally preven-t the entrance of atmospheric air thereinto.
Summary of the Inven-tion ~ metlhod and apparatus :Eor pouring molten metal in a neutral atmosphere are disclosed wherein sl.mpLe and :relat-.Lvely inexpensLve apparatus placed on a receiving vessel :eo:rms a closed passageway from a ladle,converter or simiLar source of molten metal to the receiving vessel and is moved to a position on the molten metal in the receiving vessel when -the same is filled to main-tain the closure with respect to.the atmosphere ~LZ297~;
while the mol-ten me-tal is discharged :Erom the receiving vessel.
~ powdered hot top compound may be and preferably is applied to the surface o-E the mol-ten metal to insure sealing of the same wi-th respec-t to -the atmosphere and -the movable closure and closed passageway.
Description of the Drawings Figure 1 is a fragmentary vertical section through a portiorl of an ingot mold and illustra-ting -the a-tmosphere excludlng apparatus in a firs-t position;
Figure 2 is a ver-tical sectional view similar to Figure 1 showing the atmospheric excluding apparatus in a second position in an ingot mold;
Figure 3 is a top plan view o~ the apparatus seen in Fi.gure 1~
L5 Figure 4 i.s a perspec-tive view showing the apparatus of Figures ~L and 3;
Figure 5 is a fragmentary vertical section through a por-tion of an ingot mold and a modified atmospher;.c excluding apparatus in a first position thereon;
Figure 6 is a vertical sectional view similar -to Figure 5 ' ~
~LZX9'7 3L~i showing -the atmospheric excluding apparatus in a second position in the ingot mold; and ~ igure 7 is a perspective view on an enlarged scale showing a ceramic sleeve which is also seen in ~igures 5 and 6 of -the drawings.
Description oi the Preeerred Embodimen-t By re:Eerring to the drawings and Figure 1 in parti.cular a :Eragmetltary view o:E -the upper por-tion oE a receivin~ vessel 10 which may be an ingo-t mold or a -trumpet -Cunnel O-e a bottom poured ingot mold or a tundish box -Eor a continuous caster will be seen -to be substantially filled wi-th molten metal M which has been introduced in-to -the receiving vessel 10 ~rom a ladle 11 or o-ther source o:E molten metal. The molten metal M is introduced in-to the rece:Lving vesse] 10 through an opening 12 located in a closure 13 positioned on the open upper end o:E the receiving vessel 10. The closure 13 may be a sheet-like sec-tion o~ insu:Lating fiber board or the like. The opening 12 in the closure 13 is fo:rmed subs-tantially centrally -thereoE
as may be seen by reEerring to Figu:re 4 o-E the drawings.
Mol.ten metal is introduced into the opening 12 of the closure ~L229~7~;
13 from the ladle or other source Oe mo:Lten meta]. by way o:E a -tubu].c~r nozzle 1~ the lower end po:r-tion Oe which is providecl with an air lock gaske-t 15 Iormed Oe suitable refractory fiber materials and the like which is of an overall tapered shape and thereby capable of registering in the opening 12 in the closure 13 and -forming an airtigh-t closure.
A pair O e pipes 16 and 17 may be positioned through the horizontal wal.l of -the closu:re 13 the pipe 16 being connected by a Ilexible hose 18 wi-th a source of inert gas such as argon and the pi.pe 17 provides a sui-table lead-in for an alloy wire 19 which can be introduced into -the molten me-tal therethrough as desired.
Still referring to Figure 1 of the drawings, i-t will be seen -that the :Lower sur-face of -the closure 13 Oe insula-tillg fiber board or the like is provided with fold or score lines 20 defin:Lng a rectangular o:r o-ther shape sLightly smaller than the inner rectangular or other shape oe the rec.eiving vessel 1() and by :reeerring to Fi.gure 3 of -the drawings, a top plan view of -the appara-tus enabling the pouring of molten metal in a neutral atmosphere will be seen to include broken ~Z~7~S
e representatiorls Oe the eolcl lines or score l:ines 20 together with diagonal extensions thereof at -the -four corners of -the closure 13 and connecting with -the cu-t ou-t corners thereof as indicated by the numerals 21.
At such time as the receiving vessel 10 is filled to a desired level and the inert gas flow con-tinues, an ed~e por-tion 22 oE ~he c].osure 13 and/or -the ladle 11 and nozzle 1~ is lifted atld a covering coa-ting o~ powdered ho-t -top compound 23, as knowrl in the art, is applied to the surface of the mol-ten metal.
10. The horizon-tal sheet-like sec-tion o-f -the cl.osure 13 of insulating :Eiber board or -the like is -then pushed downwardly so as to bend the longi-tudinal edge portions 22 thereof in angular relation -there-to and form four angularly disposed edge sections resembl.ing wipers, each attached to the sheet-l.ike closure 13 o~ insulating ~5 eiber board or the like and each continuously engaging the inner walls oe the receiving vessel 10 so as to :eorm an a:irtight closure.
,Vhen -the horizon-tal sectlon of the closure 1~ is pushed downwardly to contact either the mol-ten metal M or the powdered hot top compound floating thereon, a secondary closure, Z,C.3~
no-t shown, may be placed in the opening 1" to ef-fectively seal the sur-face o:f the molten metal in the vessel 15. At the same -time the pipes 16 and 17 may be disconnected -from -their respec-tive sources of gas or metal antl/or removed comp]etely and as the molten metal ~ in the receiving vessel 10 is fed -therefrom, as :Eor example into a con-tinuous caster, the entire sealing apparatus descencls w~th the level o:E the molten metal M and maintains the atmospheric seal.
In orde:r -to insure the existence of a desirabJe neutral atmosphere in the receiving vessel. 10 when the first mol-ten me-tal is poured therein, a smal] quantity of hexamethylene, also known as cyclohexane, or any o-ther similar readily vaporizab:l.e liquid having sim-ilar properties is introduced :Lnto the receiving vessel 10 Wtlell the closure apparatus is first instal].ed so that the introduction Oe the f-irst molten metal into the receiving vessel will immediatel.y vapo-rlze the same and create a suitable gaseous environment that will expel all of the usual atmosphereic air from -the recei.ving vessel 10 and thus prevent contamination by the reoxiclation of the molten metal and the undesirable products -thereof.
.... .... . . . . , ~ :
~ ZZ~37~
?~lodifications in the apparatus ~or pouring molten me-tal in a neutra~ atmosphlsre will occur to those skilled in the art and one such modi:eication may comprise -the addition oE exothermic material as known.in the art into the closure 13 o-E insu]ating ~iber board or the like and/or a-ttaching sections of exothermic materlal 23A to the lower sur-faces o:f the closure 13 oE insulating E:Lt)t?r board or the l:lke so that the reac-tion o-E the exothermic material will add additional heat to the metal in the receiving vessel and avoid -the usual piping probl.ems -that occur, :Eor examp~e when mol.ten metal soldiEies in an ingo-t mold or the like.
Another modi-Eica-tion comprises the use O e a ceramic sleeve
2~L positioned in the opening 12 o:f the closure 13 as seen in Figures 5,6 and 7 oE the drawings. By re:Eerring thereto i.t will be seen that this modi:Eication uses an annula:r meta~
band 25 having ver-tically spaced hori~ontally extending annular Elanges 26 at-tached to the ceramic sl.eeve 24 by suitable Easteners and receiving -the edges o:E the closure 13 de-Eining the opening 12 therein. If desired, the closure 13 may be Eormed in two pieces abutting one another as shown by a broken line 27 ' ~I ' ' ! , ~Z~ 7~L~
in Flgure ~ oE tlle drawings, -to simplify the placement of -the annular band 25, the :Elanges 26, and the ceramic sleeve 2~ in the opening 12 of the closure 13. In this modification, the pipes 16 and 17 he.rei.nbefore described may be relocated in the ceramic sleeve 24 as seen in Figures 5 and 6.
It will be unders-tood by those skilled in the ar-t tha-t the ccramic sleeve 2~ Oe the modi:elcation is Iormed of re:L'ractory materials that readily withs-tand the -tempe:rature of mol-ten metal and that -the closure 13 is formed Oe refrac-tory fibers such as aluminum silica-te in a mixture which may include dolomite, sodium silica-te, pink clay, mineral wool, e-tc. and a suitable binder material such as a phenol formaldehyde resin.
The closure :13 may be provided with a transverse fold line so that il; may be Eolded for Shippitlg . See F in Fi.gure 3.
The appa:ratlls disclosed herein makes possible a method o:E
pouring steel o:r other metal in a receivitlg vesse.l such as an ingot mold, trumpe-t iunnel mold for bottom poured ingots or tundish boxes for continuous cast,ers without subjecting the molten me-tal to the normal a-tmosphere and thereby reduces or eliminates the possibility of products of reoxidation -Eorm-ing in the molten metal as would otherwise occur. The method comprises the introduction into the receiving vessel of a known ,, . . ~ . .. . : .
3L~2~37~
quantity of hexamethylene capable of formlng a gaseous cloud upon subjection to mol-ten metal ini-tially contacting the same and acting to purge the normal atmosphere from the receiving vessel,providing a closure of insulating fiber board or the like with an opening therethrough which may have a ceramic sleeve in the opening in the closure and positioning the closure with or without the ceramic sleeve on the -top o:E the receiving vessel, sealing the edges of -the closure to the upper surfaces of the receiving vessel, bringing an outlet port nozzle o-f a ladle or -the like source of molten metal into engagement wi-th the opening in the closure or against the upper end of -the ceramic sleeve, d:Lrecting molten me-tal through said opening or the ceramic s:Leeve into said receiving vessel to a desired height therein, addillg a topping of powdered hot top compound, such as acid t:rea-ted graphite or a similar mate:rial. to the sur:eace of the molten metal and moving the closure with o.r without the ceramic sleeve downwardly onto the surface of the molten me-tal and the hot topping compound thereon and permitting said closure to move downwardly in the receiving vessel with -the molten metal when the same is withdrawn therefrom so as to maintain a continuous seal with the receiving vessel and prevent the in-troduction of atmospheric air into the receiving vessel and its con-tact with -the mol-ten me-tal therein.
~z9~s The horizontally disposecl hea-t resis-tant closure 13 is preferably -Eorme~ oE low -thermal conductivity re:fractory material such as inorg~nic fibrous ma-terial, particula-te material and an organic binder; the inorganic fibrous ma-te:rial being selec-ted -Erom the group consisting of asbes-tos, calcium silica-te fiber,aluminosilicate fiber and alumina fiber; the particulate refractory material belng selectecl from a group consis-ting o:f .sllicia, alumina, ~ircon, olivine, magnesia, aluminosilicates and carbonaceous materials; and the organic binder being selected from -the group consisting o~ syn-thetic resins, natural resins and carbohydra-tes.
It will thus be seen that a method and appara-tus for pouring mol-ten metal into an ingo-t mold or a -tundish box or a continuous caster has been disclosed which is relatively simple to perform with the use of a relatively inexpens:Lve apparatus and i.t will be observed that -the apparatus is formod o~ mater:lals including inorganic :Eibrous materLa:L, particuLate refractory material and ceramic material which may be easily discarded and replaced wherl e:roded by contact with the mol-ten me-tal protec-ted -thereby.
Having -thus described my invention, what I claim is:
'
band 25 having ver-tically spaced hori~ontally extending annular Elanges 26 at-tached to the ceramic sl.eeve 24 by suitable Easteners and receiving -the edges o:E the closure 13 de-Eining the opening 12 therein. If desired, the closure 13 may be Eormed in two pieces abutting one another as shown by a broken line 27 ' ~I ' ' ! , ~Z~ 7~L~
in Flgure ~ oE tlle drawings, -to simplify the placement of -the annular band 25, the :Elanges 26, and the ceramic sleeve 2~ in the opening 12 of the closure 13. In this modification, the pipes 16 and 17 he.rei.nbefore described may be relocated in the ceramic sleeve 24 as seen in Figures 5 and 6.
It will be unders-tood by those skilled in the ar-t tha-t the ccramic sleeve 2~ Oe the modi:elcation is Iormed of re:L'ractory materials that readily withs-tand the -tempe:rature of mol-ten metal and that -the closure 13 is formed Oe refrac-tory fibers such as aluminum silica-te in a mixture which may include dolomite, sodium silica-te, pink clay, mineral wool, e-tc. and a suitable binder material such as a phenol formaldehyde resin.
The closure :13 may be provided with a transverse fold line so that il; may be Eolded for Shippitlg . See F in Fi.gure 3.
The appa:ratlls disclosed herein makes possible a method o:E
pouring steel o:r other metal in a receivitlg vesse.l such as an ingot mold, trumpe-t iunnel mold for bottom poured ingots or tundish boxes for continuous cast,ers without subjecting the molten me-tal to the normal a-tmosphere and thereby reduces or eliminates the possibility of products of reoxidation -Eorm-ing in the molten metal as would otherwise occur. The method comprises the introduction into the receiving vessel of a known ,, . . ~ . .. . : .
3L~2~37~
quantity of hexamethylene capable of formlng a gaseous cloud upon subjection to mol-ten metal ini-tially contacting the same and acting to purge the normal atmosphere from the receiving vessel,providing a closure of insulating fiber board or the like with an opening therethrough which may have a ceramic sleeve in the opening in the closure and positioning the closure with or without the ceramic sleeve on the -top o:E the receiving vessel, sealing the edges of -the closure to the upper surfaces of the receiving vessel, bringing an outlet port nozzle o-f a ladle or -the like source of molten metal into engagement wi-th the opening in the closure or against the upper end of -the ceramic sleeve, d:Lrecting molten me-tal through said opening or the ceramic s:Leeve into said receiving vessel to a desired height therein, addillg a topping of powdered hot top compound, such as acid t:rea-ted graphite or a similar mate:rial. to the sur:eace of the molten metal and moving the closure with o.r without the ceramic sleeve downwardly onto the surface of the molten me-tal and the hot topping compound thereon and permitting said closure to move downwardly in the receiving vessel with -the molten metal when the same is withdrawn therefrom so as to maintain a continuous seal with the receiving vessel and prevent the in-troduction of atmospheric air into the receiving vessel and its con-tact with -the mol-ten me-tal therein.
~z9~s The horizontally disposecl hea-t resis-tant closure 13 is preferably -Eorme~ oE low -thermal conductivity re:fractory material such as inorg~nic fibrous ma-terial, particula-te material and an organic binder; the inorganic fibrous ma-te:rial being selec-ted -Erom the group consisting of asbes-tos, calcium silica-te fiber,aluminosilicate fiber and alumina fiber; the particulate refractory material belng selectecl from a group consis-ting o:f .sllicia, alumina, ~ircon, olivine, magnesia, aluminosilicates and carbonaceous materials; and the organic binder being selected from -the group consisting o~ syn-thetic resins, natural resins and carbohydra-tes.
It will thus be seen that a method and appara-tus for pouring mol-ten metal into an ingo-t mold or a -tundish box or a continuous caster has been disclosed which is relatively simple to perform with the use of a relatively inexpens:Lve apparatus and i.t will be observed that -the apparatus is formod o~ mater:lals including inorganic :Eibrous materLa:L, particuLate refractory material and ceramic material which may be easily discarded and replaced wherl e:roded by contact with the mol-ten me-tal protec-ted -thereby.
Having -thus described my invention, what I claim is:
'
Claims (15)
1. The combination of a molten metal receiving vessel having substantially vertically standing walls and means for closing said vessel to the atmosphere and directing molten metal into said closed vessel; said means including a horiz-ontally disposed closure formed of a low thermal conductivity refractory material having an opening therein, said opening positioned for registry with a nozzle of a ladle, heat resistant air lock gasket means engaging said closure around said opening and said nozzle, said closure being movable from a first position on a lip portion of said vessel to a second position in said vessel engaging molten metal therein and arranged to float on said molten metal when the level of said molten metal falls below said second position.
2. The combination of claim 1 wherein said horizontally disposed closure is a sheet-like shape larger than and corresponding to the shape of the vessel and overlying the same.
3. The combination of claim 2 wherein the sheet-like shape of the horizontally disposed closure has score lines in its lower surface defining an area smaller than the interior of said vessel and wherein the edge portions of the sheet-like shape beyond the score lines are bendable upward in hinged relation to said sheet-like shape when said closure moves into said second position.
4. The combination of claim 1 wherein a heat resistant sleeve is positioned in said opening in said closure for registry with said nozzle of said ladle and said air lock gasket means also engages said sleeve.
5. The combination of claim 4 and wherein a flanged circular band is positioned on said sleeve inwardly of the ends thereof with said flange resting on said closure around said opening therein so as to support said sleeve thereon and close the opening thereabout.
6. The combination of claim 5 wherein said band has spaced upper and lower annular flanges thereon, said upper flange resting on said closure and closing said opening and said lower flange engaging the lower surface of said closure and forming a secondary closure for said opening.
7. The combination of claim 1 and wherein the material of which said closure is formed comprises inorganic fibrous material, particulate refractory material and a binder.
8. The combination of claim 1 and wherein the inorganic fibrous material is selected from the group consisting of asbestos, calcium silicate fiber, aluminosilicate fiber and alumina fiber.
9. The combination of claim 1 and wherein the material of which said sleeve is formed is ceramic.
10. The combination of claim 7 wherein the binder is an organic binder selected from the group consisting of synthetic resins, natural resins and carbohydrates.
11. The combination of claim 1 and wherein said closure also contains an exothermic component.
12. A closure for a tundish of a continuous caster and the like, said closure comprising a heat resistant fiber board having an opening therein, said closure being movable from a first position on said tundish to a second position in said tundish engaging said hot metal therein and arranged to float on said hot metal when the level of said hot metal falls below said second position, heat resistant air lock gasket means on said closure around said opening positioned to receive the nozzle of a hot metal ladle in sealing relation and means in said closure for introducing argon gas and the like into said tundish and for feeding lead wire and the like into said tundish simultaneously with hot metal directed through said opening from the nozzle of said ladle.
13. The method of pouring molten steel into a tundish on a continuous caster in an oxygen free atmosphere comprising the steps of sequentially; placing a flat closure on said tundish in air sealing relation thereto; placing a known quantity of hexamethylene in said tundish; engaging the nozzle of a ladle in sealing relation to said opening; pouring molten steel through the nozzle of the ladle through said opening and into said tundish so as to vaporize said hexamethylene to fill said tundish so as to vaporize said hexamethylene to fill said tundish and expel atmospheric air therefrom; pouring molten steel through said nozzle and opening to fill said tundish with said molten steel to a level adjacent said closure;
moving said closure into said tundish to rest on said molten steel.
moving said closure into said tundish to rest on said molten steel.
14. The method of claim 13 wherein a portion of said closure is moved away from said tundish sufficiently to permit a hot topping compound to be placed on said molten steel when said molten steel in said tundish reaches said level adjacent said closure and replacing said portion of said closure on said tundish.
15. The method of pouring molten steel into an ingot mold in an oxygen free atmosphere comprising the steps of sequentially; placing a flat closure on said ingot mold in air sealing relation thereto; said closure having an open-ing therein; placing a known quantity of hexamethylene in said ingot mold; engaging the nozzle of a ladle in sealing relation in said opening; pouring molten steel through the nozzle of the ladle through said opening and into said ingot mold so as to vaporize said hexamethylene to fill said ingot mold and expel atmosphereic air therefrom; pouring molten steel through said nozzle and opening to fill said ingot mold with said molten steel to a level adjacent said closure; moving said closure into said ingot mold rest on said molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000480479A CA1229715A (en) | 1985-04-30 | 1985-04-30 | Method and apparatus for pouring molten metal in a neutral atmosphere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000480479A CA1229715A (en) | 1985-04-30 | 1985-04-30 | Method and apparatus for pouring molten metal in a neutral atmosphere |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1229715A true CA1229715A (en) | 1987-12-01 |
Family
ID=4130395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000480479A Expired CA1229715A (en) | 1985-04-30 | 1985-04-30 | Method and apparatus for pouring molten metal in a neutral atmosphere |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1229715A (en) |
-
1985
- 1985-04-30 CA CA000480479A patent/CA1229715A/en not_active Expired
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| Date | Code | Title | Description |
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| MKEX | Expiry |