US3809146A - Method of opening an intermediate vessel nozzle for continuous casting - Google Patents
Method of opening an intermediate vessel nozzle for continuous casting Download PDFInfo
- Publication number
- US3809146A US3809146A US00227476A US22747672A US3809146A US 3809146 A US3809146 A US 3809146A US 00227476 A US00227476 A US 00227476A US 22747672 A US22747672 A US 22747672A US 3809146 A US3809146 A US 3809146A
- Authority
- US
- United States
- Prior art keywords
- steel
- vessel
- teeming
- oxygen
- outlet
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000009749 continuous casting Methods 0.000 title claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 38
- 239000010959 steel Substances 0.000 claims abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 17
- 239000011261 inert gas Substances 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- 210000003625 skull Anatomy 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 101100264195 Caenorhabditis elegans app-1 gene Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/118—Refining the metal by circulating the metal under, over or around weirs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
- B22D1/005—Injection assemblies therefor
-
- 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
Definitions
- molten metal in the recess above the nozzle cools more rapidly than the metal above it because it has a larger surface area in contact with the surrounding refractory, that is, it has a higher surface-to-volume ratio.
- the cooling action of the refractory can result in the formation of frozen steel or"skull in the nozzle region and prevent stream flow when the nozzle is reopened;
- the present invention affords a methodof preventing a re' cess from blocking, either before pouring begins or when pouring is interrupted.
- inert gases can be introduced to molten metal to provide various treatments. For example,
- an oxygenflow rate of from 8 to 10 cubic feet per minute for a period of 7 to 10 seconds.
- argon which is a coolant to the steel
- pure oxygen for just 10 seconds at 8 cubic feetper minute and obtained gas may be insufflated through a porous plugin a sliding gate to stir molten metal within a vessel.
- FIGURE is a partly diagrammatic cross section through the nozzle of a bottom-pour intermediate vessel equipped with a sliding gate which employs a permeable refractory block in the gas passageway beneath the vessel nozzle and includes our gas-injection apparatus.
- Vessel 10 has a refractory lining 11 for receiving molten metal.
- the bottom wall of the vessel has a well or recess 12 and an outlet opening 13 and carries a refractory nozzle plate 14 fixed to its underside aligned with the opening.
- a sliding gate closure member 15 is mounted beneath the nozzle plate.
- the gate can be supported and operated in any desired manner, hence, we have not shown the supporting and operatingmecha nism.
- the gate includes a solid refractory block 16, a surrounding steel jacket 17, and a gas-permeable refractory plug 18 centered in the upper portion of block 16.
- a pipe 19 is affixed at its upper end to jacket 17 whichforms withplug 18 a cylindrical gas distribution chamber 20. Pipe 19 extendsto sources Zland 22 of inert gas and oxygen rich gas respectively, either of which can be admitted thereto through a three-way a' free-flowing stream'having good stream characteristics.
- a flow rate of oxygen of less than 5 cubic feet per minute or for a time of less than 5 seconds does not insure that a nozzle will open.
- a flow rate greaterthan 15 cubic feet per minute of oxygen or for a time greater than 15 seconds overheats the steel, and upon teeming the metalinto the mold, the steel may melt the chill pins in the mold stool on contact.
- the mold stool will separate from the casting andthe entire heatmay be lost.
- excessive oxygen oxidizes the carbon in the steel to carbon dioxide, ca'usinghit to leave the steel as a gas.
- the solidification rate isreducedand breakouts below the mold are not only common, but-arealmostcertain.
- plate 14 is made of zirconia, which is only efiectiveto about 3,000F, above whichtemperature it willbecome eroded. Oxygen flow throughthe molten metal inthis region will burn out the zirconia insert if theuppermost diameter of the porousplugisequal to or greater than that of the opening of the zirconiainsert.
- oxygen is c. injecting inert gas to the steel in the vessel through injected at a rate of 8 to 10 scfm.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Details (AREA)
- Drilling Tools (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Priority Applications (25)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00227476A US3809146A (en) | 1972-02-18 | 1972-02-18 | Method of opening an intermediate vessel nozzle for continuous casting |
ZA722239A ZA722239B (en) | 1972-02-18 | 1972-04-04 | Method of and apparatus for opening a nozzle on a hot metal containing vessel |
IE466/72A IE36273B1 (en) | 1972-02-18 | 1972-04-10 | Method of opening a nozzle on a molten metal containing vessel |
BE781901A BE781901A (fr) | 1972-02-18 | 1972-04-10 | Procede et appareil pour ouvrir une buse prevue sur un recipient contenant du metal chaud |
AU40959/72A AU464015B2 (en) | 1972-02-18 | 1972-04-10 | Method of and apparatus for opening a nozzle ona hot metal containing vessel |
FR7212720A FR2172057B1 (cs) | 1972-02-18 | 1972-04-12 | |
AR241415A AR192926A1 (es) | 1972-02-18 | 1972-04-12 | Metodo y aparatos para el manipuleo del acero liquido contenido en una tolva de colada |
NLAANVRAGE7204984,A NL172837C (nl) | 1972-02-18 | 1972-04-13 | Werkwijze voor het gieten van vloeibaar staal uit een gietpan, waarbij wordt voorkomen dat het metaal bij de uitstroomopening stolt. |
DE19722218155 DE2218155C3 (de) | 1972-02-18 | 1972-04-14 | Verfahren zur Behandlung von flüssigem Stahl |
BR2269/72A BR7202269D0 (pt) | 1972-02-18 | 1972-04-17 | Processo e aparelho para lidar com aco liquido em um deposito intermediario |
GB1768272A GB1391984A (en) | 1972-02-18 | 1972-04-17 | Method of and apparatus for opening a zozzle on a molten metal containing vessel |
IT68197/72A IT958752B (it) | 1972-02-18 | 1972-04-17 | Procedimento e dispositivo per la colata dei metalli attraverso un ugello di fondo di una siviera o simile |
DK189372AA DK129771B (da) | 1972-02-18 | 1972-04-18 | Fremgangsmåde til behandling af flydende stål i en stobetragt som forberedelse til udstøbning af stålet i en strengstøbeform. |
NO1355/72A NO134036C (cs) | 1972-02-18 | 1972-04-19 | |
PL1972154824A PL70040B1 (cs) | 1972-02-18 | 1972-04-19 | |
CA140,036,A CA951488A (en) | 1972-02-18 | 1972-04-19 | Molten metal vessel nozzle opening method and apparatus |
RO70625A RO59235A (cs) | 1972-02-18 | 1972-04-20 | |
YU01059/72A YU36456B (en) | 1972-02-18 | 1972-04-20 | Method of pre-treating a liquid steel at continuous casting |
JP47040008A JPS5145536B2 (cs) | 1972-02-18 | 1972-04-20 | |
SU1775752A SU504462A3 (ru) | 1972-02-18 | 1972-04-20 | Способ нагрева металла в выпуском отверстии промежуточной емкости при непрерывной разливке |
AT347072A AT322126B (de) | 1972-02-18 | 1972-04-20 | Verfahren zur behandlung von flüssigem stahl in einem giessgefäss |
ES401949A ES401949A1 (es) | 1972-02-18 | 1972-04-20 | Procedimiento y aparato para manejar acero liquido en una artesa refractaria. |
HU73UE00000032A HU172909B (hu) | 1972-02-18 | 1973-02-16 | Sposob nepreryvnoj obrabotki zhidkoj stali v litejnom sosude pered otlivkoj |
DD168912A DD101581A5 (cs) | 1972-02-18 | 1973-02-16 | |
CS731182A CS193021B2 (en) | 1972-02-18 | 1973-02-19 | Method of preparation of the liquid steel in the intermediate ladle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00227476A US3809146A (en) | 1972-02-18 | 1972-02-18 | Method of opening an intermediate vessel nozzle for continuous casting |
Publications (1)
Publication Number | Publication Date |
---|---|
US3809146A true US3809146A (en) | 1974-05-07 |
Family
ID=22853255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00227476A Expired - Lifetime US3809146A (en) | 1972-02-18 | 1972-02-18 | Method of opening an intermediate vessel nozzle for continuous casting |
Country Status (24)
Country | Link |
---|---|
US (1) | US3809146A (cs) |
JP (1) | JPS5145536B2 (cs) |
AR (1) | AR192926A1 (cs) |
AT (1) | AT322126B (cs) |
AU (1) | AU464015B2 (cs) |
BE (1) | BE781901A (cs) |
BR (1) | BR7202269D0 (cs) |
CA (1) | CA951488A (cs) |
CS (1) | CS193021B2 (cs) |
DD (1) | DD101581A5 (cs) |
DK (1) | DK129771B (cs) |
ES (1) | ES401949A1 (cs) |
FR (1) | FR2172057B1 (cs) |
GB (1) | GB1391984A (cs) |
HU (1) | HU172909B (cs) |
IE (1) | IE36273B1 (cs) |
IT (1) | IT958752B (cs) |
NL (1) | NL172837C (cs) |
NO (1) | NO134036C (cs) |
PL (1) | PL70040B1 (cs) |
RO (1) | RO59235A (cs) |
SU (1) | SU504462A3 (cs) |
YU (1) | YU36456B (cs) |
ZA (1) | ZA722239B (cs) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3982582A (en) * | 1973-12-08 | 1976-09-28 | Concast Ag | Method and apparatus for casting metals into a continuous casting mold |
US4003561A (en) * | 1973-11-23 | 1977-01-18 | United States Steel Corporation | Pouring of metals |
US4202533A (en) * | 1978-08-24 | 1980-05-13 | Daussan Et Compagnie | Method and a device for unchoking the casting outlet of a metallurgical vessel |
US4219188A (en) * | 1978-08-19 | 1980-08-26 | Stopinc Aktiengesellschaft | Slide valve for the injection of material for use in the outlet of a metallurgical vessel |
FR2513909A1 (fr) * | 1981-10-05 | 1983-04-08 | Korf Technologies Inc | Procede et appareil pour le traitement d'un metal liquide dans un recipient |
EP0080997A1 (de) * | 1981-11-27 | 1983-06-08 | Manfred Dipl.-Ing. Haissig | Vorrichtung zum Stranggiessen von Metallen |
US4520860A (en) * | 1983-02-28 | 1985-06-04 | Manfred Haissig | Horizontal continuous casting apparatus |
US4602729A (en) * | 1983-03-24 | 1986-07-29 | Flo-Con Systems, Inc. | Stationary plate and well nozzle for use in a sliding gate valve |
US4641768A (en) * | 1984-05-11 | 1987-02-10 | Uss Engineers And Consultants, Inc. | Teeming apparatus and method |
US4697632A (en) * | 1982-06-11 | 1987-10-06 | Howmet Turbine Components Corporation | Ceramic porous bodies suitable for use with superalloys |
US4789140A (en) * | 1982-06-11 | 1988-12-06 | Howmet Turbine Components Corporation | Ceramic porous bodies suitable for use with superalloys |
US5004131A (en) * | 1990-04-16 | 1991-04-02 | Bethlehem Steel Corporation | Molten metal slide gate valve |
US5119976A (en) * | 1987-06-05 | 1992-06-09 | Stopinc Aktiengsellschaft | Process and apparatus for injecting gas into a discharge opening of a metallurgical vessel |
US5945063A (en) * | 1997-02-25 | 1999-08-31 | Tokyo Yogyo Kabushiki Kaisha | Bottom blown gas blowing apparatus for molten metal ladle |
CN112756598A (zh) * | 2021-01-22 | 2021-05-07 | 江苏高鑫高温新材料科技有限公司 | 耐冲涮耐磨的超长寿命中间包上水口 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1575601A (en) * | 1976-01-22 | 1980-09-24 | Didier Werke Ag | Refractory structures for outlet valves for metallurgical vessels |
JPS53115617A (en) * | 1977-03-22 | 1978-10-09 | Sumitomo Metal Ind | Reducing of large impurities of continuous casted segment |
CA1141174A (en) * | 1979-10-31 | 1983-02-15 | Guy Savard | Homogenization of metal using gas |
FR2533473A1 (fr) * | 1982-09-28 | 1984-03-30 | Detalle Richard | Mode de controle et d'ouverture des orifices de coulee des recipients conteneurs de metaux liquides et autres, et dispositif de mise en oeuvre |
CN113365759B (zh) * | 2019-01-30 | 2023-07-25 | 杰富意钢铁株式会社 | 滑动水口装置的控制方法及铸片的制造方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3320053A (en) * | 1964-09-25 | 1967-05-16 | Bethlehem Steel Corp | Method of injecting gases into steel melts |
US3581948A (en) * | 1969-08-11 | 1971-06-01 | Interstop Ag | Sliding gate of a casting ladle for pouring liquid metals |
US3684267A (en) * | 1970-01-12 | 1972-08-15 | United States Steel Corp | Apparatus for introducing gas to hot metal in a bottom-pour vessel |
US3773226A (en) * | 1970-04-23 | 1973-11-20 | Didier Werke Ag | Container with sliding shutter for a liquid melt |
-
1972
- 1972-02-18 US US00227476A patent/US3809146A/en not_active Expired - Lifetime
- 1972-04-04 ZA ZA722239A patent/ZA722239B/xx unknown
- 1972-04-10 IE IE466/72A patent/IE36273B1/xx unknown
- 1972-04-10 BE BE781901A patent/BE781901A/xx not_active IP Right Cessation
- 1972-04-10 AU AU40959/72A patent/AU464015B2/en not_active Expired
- 1972-04-12 AR AR241415A patent/AR192926A1/es active
- 1972-04-12 FR FR7212720A patent/FR2172057B1/fr not_active Expired
- 1972-04-13 NL NLAANVRAGE7204984,A patent/NL172837C/xx not_active IP Right Cessation
- 1972-04-17 BR BR2269/72A patent/BR7202269D0/pt unknown
- 1972-04-17 IT IT68197/72A patent/IT958752B/it active
- 1972-04-17 GB GB1768272A patent/GB1391984A/en not_active Expired
- 1972-04-18 DK DK189372AA patent/DK129771B/da not_active IP Right Cessation
- 1972-04-19 CA CA140,036,A patent/CA951488A/en not_active Expired
- 1972-04-19 PL PL1972154824A patent/PL70040B1/pl unknown
- 1972-04-19 NO NO1355/72A patent/NO134036C/no unknown
- 1972-04-20 YU YU01059/72A patent/YU36456B/xx unknown
- 1972-04-20 ES ES401949A patent/ES401949A1/es not_active Expired
- 1972-04-20 RO RO70625A patent/RO59235A/ro unknown
- 1972-04-20 JP JP47040008A patent/JPS5145536B2/ja not_active Expired
- 1972-04-20 AT AT347072A patent/AT322126B/de not_active IP Right Cessation
- 1972-04-20 SU SU1775752A patent/SU504462A3/ru active
-
1973
- 1973-02-16 HU HU73UE00000032A patent/HU172909B/hu unknown
- 1973-02-16 DD DD168912A patent/DD101581A5/xx unknown
- 1973-02-19 CS CS731182A patent/CS193021B2/cs unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3320053A (en) * | 1964-09-25 | 1967-05-16 | Bethlehem Steel Corp | Method of injecting gases into steel melts |
US3581948A (en) * | 1969-08-11 | 1971-06-01 | Interstop Ag | Sliding gate of a casting ladle for pouring liquid metals |
US3684267A (en) * | 1970-01-12 | 1972-08-15 | United States Steel Corp | Apparatus for introducing gas to hot metal in a bottom-pour vessel |
US3773226A (en) * | 1970-04-23 | 1973-11-20 | Didier Werke Ag | Container with sliding shutter for a liquid melt |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4003561A (en) * | 1973-11-23 | 1977-01-18 | United States Steel Corporation | Pouring of metals |
US3982582A (en) * | 1973-12-08 | 1976-09-28 | Concast Ag | Method and apparatus for casting metals into a continuous casting mold |
US4219188A (en) * | 1978-08-19 | 1980-08-26 | Stopinc Aktiengesellschaft | Slide valve for the injection of material for use in the outlet of a metallurgical vessel |
US4202533A (en) * | 1978-08-24 | 1980-05-13 | Daussan Et Compagnie | Method and a device for unchoking the casting outlet of a metallurgical vessel |
FR2513909A1 (fr) * | 1981-10-05 | 1983-04-08 | Korf Technologies Inc | Procede et appareil pour le traitement d'un metal liquide dans un recipient |
EP0080997A1 (de) * | 1981-11-27 | 1983-06-08 | Manfred Dipl.-Ing. Haissig | Vorrichtung zum Stranggiessen von Metallen |
US4697632A (en) * | 1982-06-11 | 1987-10-06 | Howmet Turbine Components Corporation | Ceramic porous bodies suitable for use with superalloys |
US4789140A (en) * | 1982-06-11 | 1988-12-06 | Howmet Turbine Components Corporation | Ceramic porous bodies suitable for use with superalloys |
US4520860A (en) * | 1983-02-28 | 1985-06-04 | Manfred Haissig | Horizontal continuous casting apparatus |
US4602729A (en) * | 1983-03-24 | 1986-07-29 | Flo-Con Systems, Inc. | Stationary plate and well nozzle for use in a sliding gate valve |
US4641768A (en) * | 1984-05-11 | 1987-02-10 | Uss Engineers And Consultants, Inc. | Teeming apparatus and method |
US5119976A (en) * | 1987-06-05 | 1992-06-09 | Stopinc Aktiengsellschaft | Process and apparatus for injecting gas into a discharge opening of a metallurgical vessel |
US5004131A (en) * | 1990-04-16 | 1991-04-02 | Bethlehem Steel Corporation | Molten metal slide gate valve |
US5945063A (en) * | 1997-02-25 | 1999-08-31 | Tokyo Yogyo Kabushiki Kaisha | Bottom blown gas blowing apparatus for molten metal ladle |
CN112756598A (zh) * | 2021-01-22 | 2021-05-07 | 江苏高鑫高温新材料科技有限公司 | 耐冲涮耐磨的超长寿命中间包上水口 |
Also Published As
Publication number | Publication date |
---|---|
NL7204984A (cs) | 1973-08-21 |
ES401949A1 (es) | 1975-10-16 |
NO134036C (cs) | 1976-08-11 |
SU504462A3 (ru) | 1976-02-25 |
JPS5145536B2 (cs) | 1976-12-04 |
CS193021B2 (en) | 1979-09-17 |
ZA722239B (en) | 1972-12-27 |
BR7202269D0 (pt) | 1973-09-25 |
YU105972A (en) | 1982-02-25 |
BE781901A (fr) | 1972-10-11 |
AU464015B2 (en) | 1975-07-24 |
NL172837C (nl) | 1983-11-01 |
NO134036B (cs) | 1976-05-03 |
DK129771C (cs) | 1975-04-28 |
AT322126B (de) | 1975-05-12 |
FR2172057B1 (cs) | 1978-02-10 |
IE36273L (en) | 1973-08-18 |
RO59235A (cs) | 1976-02-15 |
JPS4893530A (cs) | 1973-12-04 |
GB1391984A (en) | 1975-04-23 |
AR192926A1 (es) | 1973-03-21 |
HU172909B (hu) | 1978-12-28 |
NL172837B (nl) | 1983-06-01 |
DE2218155B2 (de) | 1977-06-23 |
CA951488A (en) | 1974-07-23 |
DD101581A5 (cs) | 1973-11-12 |
YU36456B (en) | 1984-02-29 |
FR2172057A1 (cs) | 1973-09-28 |
AU4095972A (en) | 1973-10-18 |
IE36273B1 (en) | 1976-09-29 |
DK129771B (da) | 1974-11-18 |
PL70040B1 (cs) | 1973-12-31 |
DE2218155A1 (de) | 1973-08-23 |
IT958752B (it) | 1973-10-30 |
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Owner name: USX CORPORATION, A CORP. OF DE, STATELESS Free format text: MERGER;ASSIGNOR:UNITED STATES STEEL CORPORATION (MERGED INTO);REEL/FRAME:005060/0960 Effective date: 19880112 |