DE3123645A1 - "METHOD FOR PRODUCING SEAMLESS COPPER PIPES" - Google Patents
"METHOD FOR PRODUCING SEAMLESS COPPER PIPES"Info
- Publication number
- DE3123645A1 DE3123645A1 DE19813123645 DE3123645A DE3123645A1 DE 3123645 A1 DE3123645 A1 DE 3123645A1 DE 19813123645 DE19813123645 DE 19813123645 DE 3123645 A DE3123645 A DE 3123645A DE 3123645 A1 DE3123645 A1 DE 3123645A1
- Authority
- DE
- Germany
- Prior art keywords
- water
- pipe
- mandrel
- beginning
- tube
- 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.)
- Granted
Links
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims description 12
- 229910052802 copper Inorganic materials 0.000 title claims description 12
- 239000010949 copper Substances 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- IHPYMWDTONKSCO-UHFFFAOYSA-N 2,2'-piperazine-1,4-diylbisethanesulfonic acid Chemical compound OS(=O)(=O)CCN1CCN(CCS(O)(=O)=O)CC1 IHPYMWDTONKSCO-UHFFFAOYSA-N 0.000 title 1
- 239000007990 PIPES buffer Substances 0.000 title 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 13
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 241000589614 Pseudomonas stutzeri Species 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/023—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes by immersion in a bath
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/005—Copper or its alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B2045/0227—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
- B21B25/04—Cooling or lubricating mandrels during operation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
- Heat Treatment Of Articles (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Description
Kabel- und Metallwerke
Gutehoffnungshütte AktiengesellschaftCable and metal works
Gutehoffnungshütte Aktiengesellschaft
2 2552 255
11. Juni 1981June 11, 1981
Die Erfindung betrifft ein Verfahren zur Herstellung nahtloser Kupferrohre, bei dem ein rotglühender Kupferblock mittels
eines Dornes und zwei oder drei schräg gestellter Walzen gelocht und gestreckt wird, und das gewalzte Rohr unmittelbar
hinter dem Walzspalt in ein Wasserbecken eingeführt wird«The invention relates to a method for producing seamless copper tubes, in which a red-hot copper block by means of
a mandrel and two or three inclined rollers is punched and stretched, and the rolled tube immediately
is introduced into a water basin behind the roll gap «
Bei einem bekannten Verfahren (DE-OS 2 356 985) wird das aus
dem Walzspalt austretende Kupferrohr in ein unmittelbar hinter dem Walzenpaar angeordnetes Wasserbecken eingeführt. Auf diese
Weise wird ein Kupferrohr mit oxidfreier Oberfläche erhalten.
Der wesentliche Vorteil dieses Verfahrens liegt darin, daß auf aufwendige und umweltschädliche Beizvorgänge, um die Oxidschicht
zu entfernen, verzichtet werden kann.In a known method (DE-OS 2 356 985) this is turned off
The copper pipe exiting the roll gap is introduced into a water basin immediately behind the pair of rolls. In this way, a copper pipe with an oxide-free surface is obtained.
The main advantage of this process is that there is no need for costly and environmentally harmful pickling processes to remove the oxide layer.
Es hat sich jedoch gezeigt, daß unter bestimmten Umständen dieHowever, it has been shown that under certain circumstances the
• gewalzten Rohre an ihrer inneren Oberfläche Blasen aufweisen, die bei den nachfolgenden Arbeitsgängen, wie Pilgern und Ziehen zu Rohrabrissen führen. Die Ursache für diese Blasen wird darin gesehen, daß aus dem Wasserbecken Wasser in das• rolled tubes have bubbles on their inner surface, which lead to pipe ruptures in subsequent operations, such as pilgrimage and pulling. The cause of these bubbles is seen in the fact that from the water basin water into the
5 offene Rohrende eintreten kann und bis in die unmittelbare Nähe des Dornes strömt und dort verdampft. Wenn nun aufgrund der großen Beanspruchungen der Metallblock vor der Dornspitze aufreißt, kann Wasserdampf in diesen Bereich eindringen und dort zu Blasen führen.5 open pipe end can enter and flows into the immediate vicinity of the mandrel and evaporates there. If now due to Due to the high stresses on the metal block in front of the mandrel tip, water vapor can penetrate into this area and lead to bubbles there.
Der Erfindung liegt von daher die Aufgabe zugrunde, das bekannte Verfahren dahingehend zu verbessern, daß diese Innenblasen nicht mehr entstehen.The invention is therefore based on the object of improving the known method to the effect that these inner bubbles no longer arise.
Diese Aufgabe wird dadurch gelöst, daß gemäß der Erfindung der Wasserstand des Wasserbeckens zu Beginn des Walzvorgangs abgesenkt ist, so daß das gewalzte Rohr oberhalb des Pegels durchläuft, und das Rohr von außen mit Wasser besprüht wird, und daß der Wasserstand des Wasserbeckens angehoben wird, sowie der Rohranfang aus dem Wasserkasten ausgetreten ist.This object is achieved in that, according to the invention, the water level of the water basin is lowered at the beginning of the rolling process is so that the rolled pipe passes above the level, and the pipe is sprayed with water from the outside, and that the water level of the water basin is raised as soon as the beginning of the pipe has emerged from the water tank.
Durch die erfindungsgemäßen Maßnahmen ist sichergestellt, daß kein Wasser in das offene Rohrende eintreten kann. Eine äußere Oxidation des Rohres zu einem Zeitpunkt, in dem der Wasserstand des Wasserbeckens abgesenkt ist, wird durch das Besprühen mit Wasser vermieden.The measures according to the invention ensure that no water can enter the open end of the pipe. An external oxidation of the pipe at a time when the water level of the water basin is lowered, is avoided by spraying with water.
Nach einer besonders vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens ist vorgesehen, daß das gewalzte Rohr durch in Abstand zueinander angeordnete Wasserdüsen hindurchgeführt wird, die erst dann Wasser auf das Rohr sprühen, wenn der Rohranfang jeweils durch sie durchgetreten ist. Eine noch bessere Qualität der inneren Rohroberfläche erhält man, wenn man in das Rohrinnere ein Schutzgas einleitet. Dieses Schutzgas verhindert, daß schädlicher Sauerstoff in den Bereich vor der Dornspitze gelangt, der dort ähnlich wie Wasserdampf zu Fehlern führen würde. In besonders zweckmäßiger Weise wird das Schutzgas durch die mit einem Längskanal versehene Dornstange eingeleitet.According to a particularly advantageous embodiment of the invention The method provides that the rolled tube is passed through water nozzles arranged at a distance from one another which only spray water on the pipe when the beginning of the pipe has passed through them. An even better one The quality of the inner pipe surface is obtained when a protective gas is introduced into the pipe interior. This protective gas prevents that harmful oxygen reaches the area in front of the mandrel tip, which, like water vapor, leads to errors there would. In a particularly expedient manner, the protective gas is introduced through the mandrel bar, which is provided with a longitudinal channel.
— 3 —- 3 -
Die Erfindung betrifft weiterhin eine Vorrichtung zur Durchführung des Verfahrens, die aus einem Schrägwalzenpaar, einem an einer Dornstange befestigten Dorn sowie einem in Durchlaufrichtung gesehen hinter dem Walzspalt angeordneten Wasserkasten besteht. In Abänderung der bekannten Vorrichtung sind unmittel-. bar hinter dem Walzspalt in Abstand zueinander angeordnete ringförmige Sprühdüsen angeordnet und am Wasserkasten Mittel vorgesehen, die ein rasches Absenken und Anheben des Wasserstandes möglich machen.The invention also relates to a device for implementation of the process, which consists of a pair of skew rollers, a a mandrel attached to a mandrel bar and a water box arranged behind the roll gap, viewed in the direction of passage consists. In modification of the known device are immediate. bar behind the roll gap arranged at a distance from one another annular Arranged spray nozzles and provided on the water tank means that a rapid lowering and raising of the water level make possible.
Die Erfindung ist an Hand des in der Fig. dargestellten Äusführungsbeispiels näher erläutert.The invention is based on the embodiment shown in the figure explained in more detail.
Mittels eines nicht dargestellten Stößels wird ein Kupferblock in den durch die Walzen 2 gebildeten Walzspalt eingeschoben. Die Walzen 2 sind in einem Walzgerüst 3 angeordnet. Sie sind leicht schräg gestellt, so daß der Kupferblock 1 von ihnen weitertransportiert und dabei gleichzeitig um seine Längsachse gedreht wird» In den Walzspalt ragt ein Dorn 4 hinein, der an einer Dornstange 6 befestigt ist. Die Dornstange ist in nicht dargestellter Weise in mehreren Führungen geführt und an einem Dornstangenhalter 7 befestigt. Der Kupferblock 1 wird über den Dorn 4 gewalzt, so daß ein Rohr entsteht. Nach Fertigstellung des Rohres wird die Dornstange 6 mit dem Dorn 4 aus dem Rohr gezogen und dieses seitlich abgeworfen.A copper block is created by means of a plunger (not shown) inserted into the nip formed by the rollers 2. The rolls 2 are arranged in a roll stand 3. You are light inclined, so that the copper block 1 is transported by them and at the same time rotated about its longitudinal axis » A mandrel 4, which is attached to a mandrel rod 6, protrudes into the roll gap. The mandrel bar is not shown in FIG Way out in several guides and attached to a mandrel holder 7. The copper block 1 is rolled over the mandrel 4, so that a pipe is formed. After completion of the pipe, the mandrel rod 6 with the mandrel 4 is pulled out of the pipe and this thrown off to the side.
Um eine Oxidation der Oberfläche des aus dem Walzspalt austretenden Rohres zu verhindern, tritt das Rohr in einen Wasserkasten ein. Zu Beginn des Walzvorganges ist der Wasserstand im Wasserkasten 8 so weit abgesenkt, daß das Rohr nicht mit dem Wasser im Wasserkasten 8 in Berührung kommt. Die Kühlung des Rohres wird von mehreren Düsen 5 übernommen, von denen jede angeschaltet wird, sowie der Rohranfang diese passiert hat. Wesentlich dabei ist, daß kein Wasser in das Rohrinnere dringen kann. Hat der Rohranfang die in Durchlaufrichtung gesehen letzte Sprühdüse 5 passiert, die in der Trennwand 9 angeordnet ists wird der Wasserstand im Wasserkasten 8 rasch angehoben (gestrichelte Linie),, undIn order to prevent oxidation of the surface of the pipe emerging from the roll gap, the pipe enters a water tank. At the beginning of the rolling process, the water level in the water tank 8 is lowered so far that the pipe does not come into contact with the water in the water tank 8. The cooling of the pipe is taken over by several nozzles 5, each of which is switched on as soon as the beginning of the pipe has passed it. It is essential that no water can penetrate the inside of the pipe. If the pipe passes through the top as seen in the direction of passage last spray nozzle 5, which is arranged in the partition wall 9 s, the water level in the water tank 8 is quickly raised (broken line) ,, and
die mittleren Düsen 5 werden abgeschaltet. Die in Durchlaufrichtung gesehen erste und letzte Düse bleiben eingeschaltet, um zu verhindern, daß Wasser aus den Durchtrittsöffnungen austritt. Zur beschleunigten Füllung und Entleerung im Wasserkasten 8 dient eine Öffnung 10, die an eine leistungsstarke Pumpe angeschlossen ist. Ein Abfluß 11 sorgt dafür, daß das von dem Rohr abtropfende Wasser ablaufen kann. Um zu verhindern, daß Sauerstoff in das Rohrinnere und insbesondere in den Bereich vor der Dornspitze gelangen kann, weist die Dornstange 6 einen Schutzgasanschluß 12 auf, durch den Schutzgas z. B. Stickstoff in das Innere des Rohres eingeleitet wird.the middle nozzles 5 are switched off. The one in the direction of passage seen first and last nozzle remain switched on to prevent water from escaping from the passage openings. An opening 10, which is connected to a powerful pump, is used for accelerated filling and emptying in the water tank 8 is. A drain 11 ensures that the water dripping off the pipe can run off. To prevent oxygen can get into the inside of the tube and in particular into the area in front of the mandrel tip, the mandrel rod 6 has a protective gas connection 12, through the protective gas z. B. nitrogen is introduced into the interior of the tube.
Mit Hilfe des erfindungsgemäßen Verfahrens ist es gelungen, Kupferblöcke zu Rohren zu verwalzen, die eine oxidationsfreie äußere Oberfläche und eine innere Oberfläche, die frei von Blasen ist, aufweisen.With the help of the method according to the invention it has been possible to Copper blocks are rolled into tubes that have an oxidation-free outer surface and an inner surface that is free from Bubbles.
Claims (5)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813123645 DE3123645A1 (en) | 1981-06-15 | 1981-06-15 | "METHOD FOR PRODUCING SEAMLESS COPPER PIPES" |
| EP81110522A EP0067906A3 (en) | 1981-06-15 | 1981-12-17 | Method for the production of seamless copper pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813123645 DE3123645A1 (en) | 1981-06-15 | 1981-06-15 | "METHOD FOR PRODUCING SEAMLESS COPPER PIPES" |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3123645A1 true DE3123645A1 (en) | 1982-12-30 |
| DE3123645C2 DE3123645C2 (en) | 1992-06-04 |
Family
ID=6134728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19813123645 Granted DE3123645A1 (en) | 1981-06-15 | 1981-06-15 | "METHOD FOR PRODUCING SEAMLESS COPPER PIPES" |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0067906A3 (en) |
| DE (1) | DE3123645A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19604969A1 (en) * | 1996-02-02 | 1997-08-07 | Mannesmann Ag | Rolling mandrel and rolling rod for cross rolling mills |
| CN102773303A (en) * | 2012-07-16 | 2012-11-14 | 中国船舶重工集团公司第七二五研究所 | Copper nickel alloy large-size thick-wall seamless pipe manufacturing process |
| DE102019205724A1 (en) * | 2019-04-18 | 2020-10-22 | Sms Group Gmbh | Cooling device for seamless steel pipes |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10107567A1 (en) * | 2001-02-17 | 2002-08-29 | Sms Meer Gmbh | Process for cold rolling seamless copper tubes |
| CN101994875B (en) * | 2009-08-25 | 2012-08-22 | 山东中佳新材料有限公司 | Method for manufacturing seamless copper pipe and rod core used for cold rolling mill |
| CN105436220B (en) * | 2015-12-01 | 2018-02-16 | 青岛华仁技术孵化器有限公司 | A kind of cold pilger mill endoporus degreaser |
| BR112020009218B1 (en) * | 2017-11-29 | 2024-01-09 | Nippon Steel Corporation | SEAMLESS STEEL TUBE PRODUCTION METHOD |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3782160A (en) * | 1970-11-05 | 1974-01-01 | G Kheifets | Pipe quenching unit |
| DE2356985A1 (en) * | 1973-11-15 | 1975-05-22 | Kabel Metallwerke Ghh | Hot-rolled seamless metal tubes mfr. - esp. of copper and copper alloys, using water or gas to prevent oxidn |
| DE2457696A1 (en) * | 1973-12-11 | 1975-06-12 | Gen Electric | CONTROL SYSTEM FOR BELT TEMPERATURE |
| DE2908458A1 (en) * | 1975-02-15 | 1980-09-18 | Kabel Metallwerke Ghh | Mandrel changing on hot rolling mill mfg. metal tube - where rolled tube is quenched in water tank, which is partly drained to facilitate mandrel replacement |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE744177C (en) * | 1939-05-24 | 1944-01-11 | Dr Fritz Singer | Process for the cold forming of metal pipes that have been coated with oxide and ignition layers after the previous annealing treatment |
| CH339897A (en) * | 1954-12-01 | 1959-07-31 | Ici Ltd | Process for the production of copper wire coated with aluminum |
| US3036825A (en) * | 1957-05-17 | 1962-05-29 | Eisenmenger Friedrich | Process and apparatus for the continuous heat treating of elongated material |
| BE672269A (en) * | 1964-11-12 | 1900-01-01 |
-
1981
- 1981-06-15 DE DE19813123645 patent/DE3123645A1/en active Granted
- 1981-12-17 EP EP81110522A patent/EP0067906A3/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3782160A (en) * | 1970-11-05 | 1974-01-01 | G Kheifets | Pipe quenching unit |
| DE2356985A1 (en) * | 1973-11-15 | 1975-05-22 | Kabel Metallwerke Ghh | Hot-rolled seamless metal tubes mfr. - esp. of copper and copper alloys, using water or gas to prevent oxidn |
| DE2457696A1 (en) * | 1973-12-11 | 1975-06-12 | Gen Electric | CONTROL SYSTEM FOR BELT TEMPERATURE |
| DE2908458A1 (en) * | 1975-02-15 | 1980-09-18 | Kabel Metallwerke Ghh | Mandrel changing on hot rolling mill mfg. metal tube - where rolled tube is quenched in water tank, which is partly drained to facilitate mandrel replacement |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19604969A1 (en) * | 1996-02-02 | 1997-08-07 | Mannesmann Ag | Rolling mandrel and rolling rod for cross rolling mills |
| DE19604969C2 (en) * | 1996-02-02 | 2000-08-24 | Sms Demag Ag | Process for the production of seamless pipes and internal tools |
| CN102773303A (en) * | 2012-07-16 | 2012-11-14 | 中国船舶重工集团公司第七二五研究所 | Copper nickel alloy large-size thick-wall seamless pipe manufacturing process |
| CN102773303B (en) * | 2012-07-16 | 2014-07-30 | 中国船舶重工集团公司第七二五研究所 | Copper nickel alloy large-size thick-wall seamless pipe manufacturing process |
| DE102019205724A1 (en) * | 2019-04-18 | 2020-10-22 | Sms Group Gmbh | Cooling device for seamless steel pipes |
| US11873538B2 (en) | 2019-04-18 | 2024-01-16 | Sms Group Gmbh | Cooling device for seamless steel pipes |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3123645C2 (en) | 1992-06-04 |
| EP0067906A2 (en) | 1982-12-29 |
| EP0067906A3 (en) | 1983-03-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| 8127 | New person/name/address of the applicant |
Owner name: KABEL- UND METALLWERKE GUTEHOFFNUNGSHUETTE AG, 450 |
|
| 8127 | New person/name/address of the applicant |
Owner name: KM-KABELMETAL AG, 4500 OSNABRUECK, DE |
|
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8339 | Ceased/non-payment of the annual fee |