EP0067374B2 - Method for the thermo-mechanical treatment of hot rolled steel - Google Patents
Method for the thermo-mechanical treatment of hot rolled steel Download PDFInfo
- Publication number
- EP0067374B2 EP0067374B2 EP82104877A EP82104877A EP0067374B2 EP 0067374 B2 EP0067374 B2 EP 0067374B2 EP 82104877 A EP82104877 A EP 82104877A EP 82104877 A EP82104877 A EP 82104877A EP 0067374 B2 EP0067374 B2 EP 0067374B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling stock
- rolling
- temperature
- subsequent
- cooled
- 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
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0231—Warm rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
Definitions
- thermomechanical treatment of rolling stock with which the structure and properties of the rolling stock are favorably influenced by a suitable choice of the forming temperatures, the forming degrees, the forming speeds, the forming times, the dwell time after the forming and the subsequent cooling can.
- the so-called "controlled rolling” of low-pearlite micro-alloyed steels achieves increased strength properties with good plastic values and good weldability.
- Controlled rolling in which the rolled steel is formed in the stable austenite range at reduced temperatures, requires special rolling mill equipment with increased drive power and stability.
- the rolling stock should have a more or less uniform temperature across the cross section in order to achieve homogeneous material properties.
- the rolling stock is either slowly, e.g. B. with air, cooled or quenched intensively with pressurized water, which then adjusts to temperature compensation.
- the rolling process is interrupted and the forming is only continued after a certain period of time. Reductions in the performance of the rolling mill cannot be avoided.
- the invention is based on the object of demonstrating a method for the thermomechanical treatment of rolled steel in continuous hot rolling which enables an improvement in the material properties and a targeted setting of a reduced forming temperature immediately before the finish stitch (s).
- the surface of the rolling stock is cooled intensively to a temperature above the martensite transformation temperature M s by means of pressurized water in the area a. Subsequently, in the phase of temperature compensation between the surface and the core of the rolling stock, further hot forming takes place in area b. In the colder edge zone, recrystallization is slowed down and, as a result of the treatment, there is a more fine-grained structure in this edge zone than occurs without cooling. As a result of the temperature compensation during shaping, the core temperature drops, which results in a refinement of the structure. In the end, the marginal zone and core show only slight differences in structure.
- the drawing shows a further cooling stage c following the treatment according to the invention, which contributes to the setting of certain strength properties as well as the previous cooling stage in area a of the drawing, but is carried out with considerably reduced cooling expenditure.
- the cooling stage indicated by area a in the drawing has a positive effect on the result of any subsequent thermomechanical treatment.
- the method according to the invention enables the material properties which are optimal for a given steel composition to be achieved.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Control Of Heat Treatment Processes (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
Die hohen Walzgeschwindigkeiten in modernen Warmwalzstraßen haben zu gesteigerten Umformtemperaturen geführt, die zwar für den Verformungswiderstand des Walzguts günstig sind, jedoch häufig negative Auswirkungen auf das Gefüge und die Werkstoffeigenschaften haben. Eine Senkung der Umformtemperaturen führt zwar zu verbesserten Werkstoffeigenschatten, hat jedoch die Nachteile eines erhöhten Kraftbedarfs für die Umformung, eines erhöhten Walzenverschleisses und einer Leistungsverringerung der Walzstraßen.The high rolling speeds in modern hot rolling mills have led to increased forming temperatures, which are favorable for the deformation resistance of the rolling stock, but often have negative effects on the structure and the material properties. A lowering of the forming temperatures leads to improved material properties, but has the disadvantages of an increased power requirement for the forming, an increased roll wear and a reduction in the performance of the rolling mills.
In verschiedenen Industrieländern werden Verfahren zur sog. thermomechanischen Behandlung von Walzgut angewendet, mit denen durch geeignete Wahl der Umformtemperaturen, der Umformgrade, der Umformgeschwindigkeiten, der Umformzeitpunkte, der Verweilzeit nach der Umformung und der anschließenden Abkühlung das Gefüge und die Eigenschaften des Walzgutes günstig beeinflußt werden können. So werden beispielsweise beim sog. « kontrollierten Walzen » von perlitarmen mikrolegierten Stählen erhöhte Festigkeitseigenschaften bei guten plastischen Werten und guter Schweißbarkeit erzielt. Das « kontrollierte Walzen », bei dem der Walzstahl bei herabgesetzten Temperaturen jedoch noch im Bereich des stabilen Austenits umgeformt wird, erfordert besondere Walzwerksausrüstungen mit erhöhter Antriebsleistung und Stabilität. Noch höher sind die Anforderungen an die Walzwerksausrüstungen beim sog. Austenitformhärten, bei welchem die Umformung des metastabilen Austenits zur Eigenschaftsverbesserung des Walzgutes ausgenutzt wird. In diesem Falle müssen die Walzwerke bereits bei der Konstruktion auf die hohen Beanspruchungen ausgelegt werden, weil das Verfahren in üblichen Walzstraßen nicht durchgeführt werden kann.In various industrialized countries, processes for the so-called thermomechanical treatment of rolling stock are used, with which the structure and properties of the rolling stock are favorably influenced by a suitable choice of the forming temperatures, the forming degrees, the forming speeds, the forming times, the dwell time after the forming and the subsequent cooling can. For example, the so-called "controlled rolling" of low-pearlite micro-alloyed steels achieves increased strength properties with good plastic values and good weldability. “Controlled rolling”, in which the rolled steel is formed in the stable austenite range at reduced temperatures, requires special rolling mill equipment with increased drive power and stability. The demands placed on the rolling mill equipment in so-called austenite form hardening are even higher, in which the shaping of the metastable austenite is used to improve the properties of the rolling stock. In this case, the rolling mills have to be designed for the high loads during the design phase, because the process cannot be carried out in conventional rolling mills.
Bei der bekannten thermischen Verfestigung aus der Walzhitze, bei dem das Walzgut nach beendeter Umformung einer intensiven Abkühlung unterworfen wird, ist ein bestimmter Wärmeentzug notwendig, um das angestrebte Vergütungsgefüge in den Randzonen der Walzadern zu erhalten. Je höher die Walzendtemperatur liegt, umso schwieriger ist diese Aufgabe zu lösen. Darüber hinaus ist dieses Verfahren nur bis zu bestimmten Walzgut-Abmessungen anwendbar.In the known thermal hardening from the rolling heat, in which the rolling stock is subjected to intensive cooling after the shaping has ended, a certain amount of heat removal is necessary in order to maintain the desired remuneration structure in the edge zones of the rolling veins. The higher the final roll temperature, the more difficult it is to solve this task. In addition, this method can only be used up to certain rolling stock dimensions.
Sowohl bei der üblichen Warmumformung in Walzstraßen als auch bei den modernen thermomechanischen Behandlungsverfahren soll das Walzgut eine mehr oder weniger gleichmäßige Temperatur über den Querschnitt aufweisen, um homogene Werkstoffeigenschaften zu erzielen. Zum Erhalt einer gleichmäßigen Temperatur über den Walzgutquerschnitt wird das Walzgut vor der maßgeblichen Umformung entweder langsam, z. B. mit Luft, abgekühlt oder mit Druckwasser intensiv abgeschreckt, wobei sich anschließend ein Temperaturausgleich einstellt. In beiden Fällen wird der Walzvorgang unterbrochen und die Umformung erst nach einer bestimmten Zeitspanne fortgesetzt. Minderungen der Leistung des Walzwerkes sind dabei nicht zu vermeiden.Both in the usual hot forming in rolling mills and in modern thermomechanical treatment processes, the rolling stock should have a more or less uniform temperature across the cross section in order to achieve homogeneous material properties. To obtain a uniform temperature across the cross section of the rolling stock, the rolling stock is either slowly, e.g. B. with air, cooled or quenched intensively with pressurized water, which then adjusts to temperature compensation. In both cases, the rolling process is interrupted and the forming is only continued after a certain period of time. Reductions in the performance of the rolling mill cannot be avoided.
Aus der FR-A-2 196 207 ist ein Verfahren zum Warmwalzen von Knüppeln zu Stabmaterial bekannt, bei dem die Walzgutoberfläche zwischen mehreren Walzgerüsten der Fertigstraße mit Wasser gekühlt und anschließend die Walzguttemperaturen in Schlingenbildnern zumindest teilweise egalisiert werden, wodurch die Temperatur über den gesamten Walzgutquerschnitt abgesenkt wird. Durch diese wiederholten Kühl- und Egalisiervorgänge soll der bei jedem Umformvorgang auftretenden Erwärmung des Walzguts entgegengewirkt und dadurch das Walzgutgefüge verbessert werden.From FR-A-2 196 207 a method for hot-rolling billets to rod material is known, in which the surface of the rolling stock between several stands of the finishing train is cooled with water and then the temperatures of the rolling stock are at least partially equalized in loop formers, whereby the temperature over the entire cross section of the rolling stock is lowered. These repeated cooling and leveling processes are intended to counteract the heating of the rolling stock that occurs in each forming process and thereby to improve the structure of the rolling stock.
Ein ähnliches Vorgehen wird in der FR-A-2 251 384 beschrieben, bei dem jedoch die Kühlvorgänge des Walzgutes nicht zwischen den einzelnen Fertiggerüsten, sondern auf einer relativ langen Strecke vor seinem Einlauf in die Fertigstraße vorgenommen werden, um auch in diesem Fall Endtemperaturen von 955 °C des aus dem letzten Fertiggerüst auslaufenden Stabmaterials nicht zu überschreiten. Die Walzgut-Durchlaufstrecke vor der Fertigstraße ist so bemessen, daß ein Temperaturausgleich zwischen den durch Besprühen mit Wasser gekühlten Randzonen und dem heißen Walzgutkern stattfindet, bevor das Walzgut in das erste Fertiggerüst einläuft.A similar procedure is described in FR-A-2 251 384, in which, however, the cooling processes of the rolling stock are not carried out between the individual finishing stands, but rather over a relatively long distance before they enter the finishing train, in this case too, in order to achieve final temperatures of Not to exceed 955 ° C of the rod material emerging from the last finishing stand. The rolling stock run before the finishing train is dimensioned so that a temperature compensation takes place between the edge zones cooled by spraying with water and the hot core of the rolling stock before the rolling stock enters the first finishing stand.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur thermomechanischen Behandlung von Walzstahl beim kontinuierlichen Warmwalzen aufzuzeigen, das eine Verbesserung der Werkstoffeigenschaften und eine gezielte Einstellung einer verringerten Umformtemperatur unmittelbar vor dem oder den Fertigstich(en) ermöglicht.The invention is based on the object of demonstrating a method for the thermomechanical treatment of rolled steel in continuous hot rolling which enables an improvement in the material properties and a targeted setting of a reduced forming temperature immediately before the finish stitch (s).
Gelöst wird diese Aufgabe durch die Merkmale des Patentanspruchs 1.This object is achieved by the features of patent claim 1.
Durch die sich bei Einhaltung der beanspruchten Werte ergebende intensive Abkühlung der Walzgutoberfläche z. B. mittels Druckwasser bildet sich in den Randzonen des Walzgutes vorteilhaft ein feinkörniges Gefüge aus. Da sich der folgende Umformvorgang unmittelbar an den intensiven Kühlvorgang anschließt und mit einem Umformgrad bzw. einer Stichabnahme von mindestens 10% vorgenommen wird, ergibt sich eine intensive Einwirkung der Umformkräfte auf das noch heiße und daher duktilere Kernmaterial, was eine Verfeinerung des Gefüges zur Folge hat. Als Ergebnis weisen Randzone und Kern nur noch geringe Gefügeunterschiede auf, wobei das erfindungsgemäß behandelte Walzgut verbesserte Werkstoffeigenschaften für die Weiterverarbeitung hat, und zwar trotz hoher Walzgeschwindigkeiten und Walztemperaturen.Due to the intensive cooling of the rolling stock surface resulting from compliance with the claimed values, e.g. B. by means of pressurized water advantageously forms a fine-grained structure in the edge zones of the rolling stock. Since the subsequent forming process immediately follows the intensive cooling process and is carried out with a degree of forming or a decrease in the stitch of at least 10%, there is an intensive influence of the forming forces on the still hot and therefore more ductile core material, which is a Refinement of the structure results. As a result, the edge zone and core have only slight structural differences, the rolled material treated according to the invention having improved material properties for further processing, in spite of high rolling speeds and rolling temperatures.
Die Erfindung soll nachstehend anhand eines im ZTU-Schaubild dargestellten Ausführungsbeispiels näher erläutert werden.The invention will be explained below with reference to an embodiment shown in the ZTU diagram.
In diesem ZTU-Schaubild sind die Kerntemperatur 1 des Walzgutes, die Randzonentemperatur 2 des Walzgutes, die Ac₃-Temperaturumwandlungslinie 3, die Ac₁-Temperaturumwandlungslinie 4 und die Martensitumwandlungslinie Ms des behandelten Stahls dargestellt.In this ZTU diagram, the core temperature 1 of the rolling stock, the
Ausgehend von der Umformtemperatur von beispielsweise 1 100°C der vorangegangenen Walzstiche erfolgt eine intensive Abkühlung des Walzgutes an seiner Oberfläche auf eine Temperatur oberhalb der Martensitumwandlungstemperatur Ms mittels Druckwasser im Bereich a. Anschließend erfolgt in der Phase des Temperaturausgleichs zwischen Oberfläche und Walzgutkern die weitere Warmumformung im Bereich b. In der kälteren Randzone ist die Rekristallisation gebremst und im Ergebnis der Behandlung liegt in dieser Randzone ein feinkörnigeres Gefüge vor, als es sich ohne Kühlung einstellt. Infolge des Temperaturausgleichs während der Formgebung fällt die Kerntemperatur ab, was eine Verfeinerung des Gefüges zur Folge hat. Im Endergebnis weisen Randzone und Kern nur noch geringe Gefügeunterschiede auf.Starting from the forming temperature of, for example, 1,100 ° C. of the preceding rolling passes, the surface of the rolling stock is cooled intensively to a temperature above the martensite transformation temperature M s by means of pressurized water in the area a. Subsequently, in the phase of temperature compensation between the surface and the core of the rolling stock, further hot forming takes place in area b. In the colder edge zone, recrystallization is slowed down and, as a result of the treatment, there is a more fine-grained structure in this edge zone than occurs without cooling. As a result of the temperature compensation during shaping, the core temperature drops, which results in a refinement of the structure. In the end, the marginal zone and core show only slight differences in structure.
Die Zeichnung zeigt eine weitere Kühlstufe c im Anschluß an die erfindungsgemäße Behandlung, die zur Einstellung bestimmter Festigkeitseigenschaften ebenso wie die vorangegangene Kühlstufe im Bereich a der Zeichnung beiträgt, jedoch mit erheblich verringertem kühltechnischen Aufwand durchgeführt wird.The drawing shows a further cooling stage c following the treatment according to the invention, which contributes to the setting of certain strength properties as well as the previous cooling stage in area a of the drawing, but is carried out with considerably reduced cooling expenditure.
Die durch den Bereich a in der Zeichnung angegebene Kühlstufe wirkt sich auf das Ergebnis jeder beliebigen nachfolgenden thermomechanischen Behandlung positiv aus.The cooling stage indicated by area a in the drawing has a positive effect on the result of any subsequent thermomechanical treatment.
Durch das erfindungsgemäße Verfahren können trotz hoher Walzgeschwindigkeiten und Walztemperaturen die für eine gegebene Stahlzusammensetzung optimalen Werkstoffeigenschaften erreicht werden.In spite of high rolling speeds and rolling temperatures, the method according to the invention enables the material properties which are optimal for a given steel composition to be achieved.
Aufstellung der verwendeten Bezugszeichen
Claims (2)
- A method for the thermomechanical treatment in the continous hot of rolled steel, in particular of wire rod and small sections, in which the rolling stock, starting from a temperature of 1100°C of the last preceding reduction pass, is cooled at a cooling rate of 1800°C/s, chracterized by cooling the surface of the rolling stock by 600°C without falling below the Ms-line and subjecting the rolling stock to a further hot forming operation during the subsequent temperature equalization between its edge zone and the core, wherein a forming degree of at least 10 % is observerd during such subsequent hot forming operation.
- A method according to claim 1, wherein the rolling stock formed in the last preceding reduction pass at approx. 1100°C is cooled on its surface with pressure water.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD81230071A DD160457A1 (en) | 1981-06-11 | 1981-06-11 | METHOD FOR THE THERMOMECHANICAL TREATMENT OF ROLLING STEEL |
| DD230714 | 1981-06-11 |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| EP0067374A2 EP0067374A2 (en) | 1982-12-22 |
| EP0067374A3 EP0067374A3 (en) | 1983-07-20 |
| EP0067374B1 EP0067374B1 (en) | 1986-12-30 |
| EP0067374B2 true EP0067374B2 (en) | 1995-10-18 |
Family
ID=5531509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82104877A Expired - Lifetime EP0067374B2 (en) | 1981-06-11 | 1982-06-03 | Method for the thermo-mechanical treatment of hot rolled steel |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0067374B2 (en) |
| AT (1) | ATE24424T1 (en) |
| DD (1) | DD160457A1 (en) |
| DE (1) | DE3274812D1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH658074A5 (en) * | 1982-10-18 | 1986-10-15 | Moos Stahl Ag | METHOD FOR COMPENSATION OF ROLLED PRODUCTS, DEVICE FOR IMPLEMENTING THE PROCEDURE AND Rebar MADE UNDER THE PROCEDURE. |
| DE3518925A1 (en) * | 1985-05-25 | 1986-11-27 | Kocks Technik Gmbh & Co, 4010 Hilden | METHOD FOR THE CONTROLLED ROD AND WIRE ROLLING OF ALLOY STEELS |
| DE19712616C2 (en) * | 1997-03-26 | 1999-07-15 | Thyssen Stahl Ag | Hot rolling of steel strip |
| RU2735308C1 (en) * | 2019-07-24 | 2020-10-29 | Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" | Thermomechanical processing method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2196207A1 (en) * | 1972-08-18 | 1974-03-15 | Morgan Construction Co | |
| CA1028535A (en) * | 1973-11-15 | 1978-03-28 | Bethlehem Steel Corporation | Method for controlling the temperature of steel during hot-rolling on a continuous hot-rolling mill |
| DE2717780B2 (en) * | 1977-04-21 | 1979-11-29 | Hamburger Stahlwerke Gmbh, 2103 Hamburg | Manufacture of wire rod |
-
1981
- 1981-06-11 DD DD81230071A patent/DD160457A1/en not_active IP Right Cessation
-
1982
- 1982-06-03 DE DE8282104877T patent/DE3274812D1/en not_active Expired
- 1982-06-03 EP EP82104877A patent/EP0067374B2/en not_active Expired - Lifetime
- 1982-06-03 AT AT82104877T patent/ATE24424T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DD160457A1 (en) | 1983-08-03 |
| ATE24424T1 (en) | 1987-01-15 |
| DE3274812D1 (en) | 1987-02-05 |
| EP0067374A2 (en) | 1982-12-22 |
| EP0067374B1 (en) | 1986-12-30 |
| EP0067374A3 (en) | 1983-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE102007005015A1 (en) | Process and plant for the production of hot rolled strip of silicon steel based on thin slabs | |
| DE2454163A1 (en) | METHOD OF CONTROLLING THE TEMPERATURE OF STEEL DURING HOT ROLLING ON A CONTINUOUS HOT ROLLING DEVICE | |
| EP0820529B1 (en) | Method of manufacturing hot-worked elongated products, in particular bar or pipe, from high-alloy or hypereutectoid steel | |
| DE10315419B3 (en) | Production of screw springs or stabilizers made from steel comprises comparing the heating temperature over the rod lengths and maintaining between the rollers | |
| DE2716791A1 (en) | METHOD OF STRENGTHENING STEEL | |
| DE3518925C2 (en) | ||
| DE2362878A1 (en) | AS-WORKED BAINITIC IRON ALLOY AND METHOD FOR MAKING IT | |
| DE3127373C2 (en) | Process for the manufacture of seamless steel tubes for the petroleum industry | |
| DE102020214427A1 (en) | Method for producing a hot strip by means of a casting and rolling plant | |
| EP0067374B2 (en) | Method for the thermo-mechanical treatment of hot rolled steel | |
| DE2353034B2 (en) | Process for improving the mechanical strength values of rolled steel products | |
| DD149380A5 (en) | METHOD FOR PRODUCING ROLLED STEEL PRODUCTS WITH INCREASED OBSTRUCTION LIMIT | |
| DE3704828C2 (en) | ||
| DE3033500A1 (en) | METHOD FOR THE DIRECT HEAT TREATMENT OF HOT ROLLED STEEL WIRE | |
| DE3507124A1 (en) | Oil-drilling pipe welded by electric resistance welding, and method for the manufacture thereof | |
| AT396073B (en) | Method for hot rolling and heat-treating bar stock | |
| EP0413163B2 (en) | Process and installation for producing thermomecanically treated rolled steel pieces | |
| DE1964795C3 (en) | Process for the heat treatment of steels directly from the deformation heat with accelerated cooling | |
| DE2818215C2 (en) | Process for continuous heat treatment of rolled sheet | |
| DE2124041C3 (en) | Application of a continuous heat treatment process to rod-shaped, hypoeutectoid heat treatable steels | |
| AT319308B (en) | Process for the heat treatment of steels with accelerated cooling directly from the deformation heat | |
| DE1408933C (en) | Process for the production of low-carbon steel sheet or strip with outstanding drawing properties | |
| AT208903B (en) | Method and device for the refining further processing of hot-rolled steel | |
| AT309494B (en) | Process for the heat treatment of light profiles made of low-carbon, unalloyed steel | |
| DE1904162C3 (en) | Procedure for adjusting a structure made of ferrite |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
| 17P | Request for examination filed |
Effective date: 19831130 |
|
| ITCL | It: translation for ep claims filed |
Representative=s name: STUDIO APRA' |
|
| TCNL | Nl: translation of patent claims filed | ||
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| ITF | It: translation for a ep patent filed | ||
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
| REF | Corresponds to: |
Ref document number: 24424 Country of ref document: AT Date of ref document: 19870115 Kind code of ref document: T |
|
| REF | Corresponds to: |
Ref document number: 3274812 Country of ref document: DE Date of ref document: 19870205 |
|
| ET | Fr: translation filed | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Effective date: 19870603 |
|
| PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
| 26 | Opposition filed |
Opponent name: SMS SCHLOEMANN-SIEMAG AG Effective date: 19870930 Opponent name: VOEST-ALPINE AKTIENGESELLSCHAFT Effective date: 19870926 Opponent name: SAARSTAHL VOELKLINGEN GMBH Effective date: 19870928 |
|
| NLR1 | Nl: opposition has been filed with the epo |
Opponent name: SMS SCLOEMANN-SIEMAG AG. Opponent name: VOEST-ALPINE AKTIENGESELLSCHAFT. Opponent name: SAARSTAHL VOELKLINGEN GMBH. |
|
| PLAB | Opposition data, opponent's data or that of the opponent's representative modified |
Free format text: ORIGINAL CODE: 0009299OPPO |
|
| RAP2 | Party data changed (patent owner data changed or rights of a patent transferred) |
Owner name: HENNIGSDORFER STAHL GBMH |
|
| R26 | Opposition filed (corrected) |
Opponent name: SAARSTAHL AG * 870926 VOEST-ALPINE AKTIENGESELLSCH Effective date: 19870928 |
|
| NLS | Nl: assignments of ep-patents |
Owner name: HENNIGSDORFER STAHL GMBH TE HENNIGSDORF, BONDSREPU |
|
| NLXE | Nl: other communications concerning ep-patents (part 3 heading xe) |
Free format text: IN PAT.BUL.24/87,CORR.:SMS SCHLOEMANN-SIEMAG AG |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PUE Owner name: HENNIGSDORFER STAHL GMBH |
|
| ITPR | It: changes in ownership of a european patent |
Owner name: CAMBIO RAGIONE SOCIALE;HENNIGSDORFER STHAL GMBH |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732 |
|
| RAP2 | Party data changed (patent owner data changed or rights of a patent transferred) |
Owner name: HENNIGSDORFER STAHL ENGINEERING GMBH |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: TP |
|
| ITTA | It: last paid annual fee | ||
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732E |
|
| NLS | Nl: assignments of ep-patents |
Owner name: HENNIGSDORFER STAHL ENGINEERING GMBH TE HENNIGSDOR |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19940524 Year of fee payment: 13 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19940526 Year of fee payment: 13 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19940630 Year of fee payment: 13 Ref country code: LU Payment date: 19940630 Year of fee payment: 13 Ref country code: FR Payment date: 19940630 Year of fee payment: 13 |
|
| EPTA | Lu: last paid annual fee | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19940803 Year of fee payment: 13 |
|
| EAL | Se: european patent in force in sweden |
Ref document number: 82104877.4 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PUE Owner name: HENNINGSDORFER STAHL ENGINEERING GMBH |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PK |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19950603 Ref country code: GB Effective date: 19950603 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19950604 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Effective date: 19950630 |
|
| PUAH | Patent maintained in amended form |
Free format text: ORIGINAL CODE: 0009272 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: PATENT MAINTAINED AS AMENDED |
|
| 27A | Patent maintained in amended form |
Effective date: 19951018 |
|
| AK | Designated contracting states |
Kind code of ref document: B2 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
| ITF | It: translation for a ep patent filed | ||
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: AEN Free format text: AUFRECHTERHALTUNG DES PATENTES IN GEAENDERTER FORM |
|
| NLR2 | Nl: decision of opposition | ||
| BERE | Be: lapsed |
Owner name: HENNIGSDORFER STAHL ENGINEERING G.B.M.H. Effective date: 19950630 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19960101 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19950603 |
|
| NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 19960101 |
|
| EUG | Se: european patent has lapsed |
Ref document number: 82104877.4 |
|
| EN | Fr: translation not filed | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19960315 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19960819 Year of fee payment: 15 |
|
| APAC | Appeal dossier modified |
Free format text: ORIGINAL CODE: EPIDOS NOAPO |
|
| APAC | Appeal dossier modified |
Free format text: ORIGINAL CODE: EPIDOS NOAPO |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19970610 Year of fee payment: 16 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980303 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980630 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980630 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| APAH | Appeal reference modified |
Free format text: ORIGINAL CODE: EPIDOSCREFNO |