EP0947590A1 - Method of manufacturing micro-alloyed construction steels - Google Patents

Method of manufacturing micro-alloyed construction steels Download PDF

Info

Publication number
EP0947590A1
EP0947590A1 EP99104265A EP99104265A EP0947590A1 EP 0947590 A1 EP0947590 A1 EP 0947590A1 EP 99104265 A EP99104265 A EP 99104265A EP 99104265 A EP99104265 A EP 99104265A EP 0947590 A1 EP0947590 A1 EP 0947590A1
Authority
EP
European Patent Office
Prior art keywords
rolling
csp
strength
solid solution
copper
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
Application number
EP99104265A
Other languages
German (de)
French (fr)
Other versions
EP0947590B1 (en
Inventor
Karl-Ernst Dr. Ing. Habil Hensger
Robert F. Davis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
SMS Demag AG
Schloemann Siemag AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SMS Schloemann Siemag AG, SMS Demag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP0947590A1 publication Critical patent/EP0947590A1/en
Application granted granted Critical
Publication of EP0947590B1 publication Critical patent/EP0947590B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • C21D8/0215—Rapid solidification; Thin strip casting
    • 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • B21B1/46—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 metal immediately subsequent to continuous casting
    • B21B1/466—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 metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling

Definitions

  • the invention relates to a method for producing microalloyed structural steels by rolling in a CSP plant, the cast slab, divided into rolling lengths, over a leveling furnace of a multi-stand CSP rolling mill fed and rolled out there continuously to hot wide strip, is cooled in a cooling section and coiled, whereby to achieve optimal mechanical properties at By running the thin slab through the CSP plant one Controlled microstructural development through thermomechanical Rolling is carried out.
  • thermomechanical forming in contrast to normalizing forming, in which the final forming in the area the normalizing temperature with complete recrystallization of austenite takes place, temperature ranges for one Targeted forming rate observed, at which the austenite is not or not substantially recrystallized.
  • thermomechanical treatment Use of plastic deformation not only for manufacturing a defined product geometry, but especially for Setting a desired real structure and thus for Guarantee of defined material properties, but not recrystallized austenite to polymorphic (Gamma) - (Alpha) conversion is coming (at the normalizing Austenite is already recrystallized).
  • thermomechanical rollers in CSP systems To the peculiarities of the development of the microstructure make optimal use of thermomechanical rollers in CSP systems, is in the unpublished German Patent application no. 19725434.9-24 to adapt to the thermal history of the in the CSP rolling mill with Cast iron structure imported thin slabs proposed at the thermomechanical first forming The recrystallization of the cast structure runs off completely before further forming. Through this Measure and by setting defined temperature and Deformation conditions become a controlled Microstructure development of the rolling stock as it passes through the CSP plant reached and the thermomechanical forming in optimally on the specific process parameters of the CSP process with its specific thermal Previous history aligned.
  • the object of the invention is that in the process steps German Patent Application No. 19725434.9-24 reached Strength development continues through suitable measures increase so that it is ensured that the in the CSP process manufactured microalloyed ferritic-pearlitic structural steels highest strength class with yield strengths ⁇ 480 MPa correspond and through these measures CSP facility, CSP process and processed material still optimal be coordinated.
  • the measure of the invention thus makes known metallurgically usable strength-increasing mechanisms of action combined with each other and geared towards the CSP process optimally applied.
  • the solid solution strengthening is in high strength ferritic-pearlitic micro-alloyed structural steels preferred caused by manganese.
  • the additional and targeted Alloy makes sense with additional elements and for the highest Strength classes is necessary.
  • the other alloy elements mentioned copper, nickel, chromium as Mixed crystal solidifiers are used. Particularly effective is the increase in strength if not with just one some of the above-mentioned dissolved in iron Elements are alloyed, but their complex use in Combination is done.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

Microalloyed constructional steels are produced by rolling steels with increased silicon and/or copper, chromium and nickel contents in a compact strip production (CSP) plant. Microalloyed constructional steels are produced by subjecting a continuously cast slab to cutting into lengths, soaking, hot rolling to wide strip in a CSP rolling mill train, cooling and coiling, a yield strength of ≥ 480 MPa and an optimal strength and toughness combination being achieved by carrying out the steps described in patent application number DE 19725434.9-24 and by increasing the silicon content and/or the copper, chromium and nickel contents for controlled solid solution strengthening. An Independent claim is also included for a high strength microalloyed constructional steel produced by the above process. Preferred Features: The steel contains 0.41-0.60% Si, 0.11-0.30% Cu, 0.20-0.60% Cr and 0.10-0.60% Ni.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von mikrolegierten Baustählen durch Walzen in einer CSP-Anlage, wobei der gegossene Brammenstrang, geteilt in Walzlängen, über einen Ausgleichsofen einer mehrgerüstigen CSP-Walzstraße zugeführt und dort kontinuierlich zu Warmbreitband ausgewalzt, in einer Kühlstrecke gekühlt und zu Bunden gehaspelt wird, wobei zur Erzielung optimaler mechanischer Eigenschaften beim Durch lauf der Dünnbramme durch die CSP-Anlage eine kontrollierte Gefügeentwicklung durch thermomechanisches Walzen durchgeführt wird.The invention relates to a method for producing microalloyed structural steels by rolling in a CSP plant, the cast slab, divided into rolling lengths, over a leveling furnace of a multi-stand CSP rolling mill fed and rolled out there continuously to hot wide strip, is cooled in a cooling section and coiled, whereby to achieve optimal mechanical properties at By running the thin slab through the CSP plant one Controlled microstructural development through thermomechanical Rolling is carried out.

Das Walzen von Warmbreitband in einer CSP-Anlage (CSP = Compact Strip Production), wobei stranggegossenes Vormaterial nach Unterteilung in Walzlängen über einen Ausgleichsofen direkt dem Walzwerk zugeführt wird, ist aus der EP-A-0368048 bekannt, wobei als Walzwerk ein mehrgerüstiges Walzwerk eingesetzt wird, in das die auf eine Temperatur von 1100 °C bis 1130 °C im Ausgleichsofen gebrachten Walzlängen in aufeinanderfolgenden Arbeitsschritten mit dazwischen liegender Entzunderung fertig gewalzt werden.Rolling hot wide strip in a CSP plant (CSP = Compact Strip Production), whereby continuously cast material after subdivision into rolling lengths via a compensating furnace is fed directly to the rolling mill is from EP-A-0368048 known, being a multi-stand rolling mill is used, in which the temperature is 1100 ° C up to 1130 ° C in the compensating furnace successive work steps with intermediate Descaling can be finished rolled.

Um eine Verbesserung der Festigkeits- und Zähigkeitseigenschaften sowie der damit verbundenen wesentlichen Erhöhung der Streckgrenzwerte und der Kerbschlagzähigkeit eines Walzproduktes aus Stahl zu erreichen, wird in der EP-A-0413163 vorgeschlagen, das Walzgut thermomechanisch zu behandeln.To improve strength and Toughness properties and the associated significant increase in the yield strength and the Notched impact strength of a rolled product made of steel achieve, is proposed in EP-A-0413163, the rolling stock treat thermomechanically.

Bei der thermomechanischen Umformung werden im Gegensatz zum normalisierenden Umformen, bei der die Endumformung im Bereich der Normalglühtemperatur mit vollständiger Rekristallisation des Austenits stattfindet, Temperaturbereiche für eine gezielte Umformrate eingehalten, bei denen der Austenit nicht oder nicht wesentlich rekristallisiert.In thermomechanical forming, in contrast to normalizing forming, in which the final forming in the area the normalizing temperature with complete recrystallization of austenite takes place, temperature ranges for one Targeted forming rate observed, at which the austenite is not or not substantially recrystallized.

Wesensmerkmal der thermomechanischen Behandlung ist die Nutzung der plastischen Deformation nicht nur zur Herstellung einer definierten Produktgeometrie, sondern insbesondere zur Einstellung einer gewünschten Realstruktur und damit zur Gewährleistung definierter Werkstoffeigenschaften, wobei nicht rekristallisierter Austenit zur polymorphen (Gamma)-(Alpha)-Umwandlung kommt (bei der normalisierenden Umformung ist der Austenit bereits rekristallisiert).The essential feature of thermomechanical treatment is Use of plastic deformation not only for manufacturing a defined product geometry, but especially for Setting a desired real structure and thus for Guarantee of defined material properties, but not recrystallized austenite to polymorphic (Gamma) - (Alpha) conversion is coming (at the normalizing Austenite is already recrystallized).

Herkömmliche Brammen unterliegen bei Kalteinsatz vor ihrer Umformung in einem konventionellen Walzwerk den polymorphen Umwandlungen: Schmelze → Ferrit (Delta) → Austenit A1 (Gamma) → Ferrit (Alpha) → Austenit A2 (Gamma) während für die CSP-Technologie gilt: Schmelze → Ferrit (Delta) → Austenit A1 (Gamma) mit einer höheren Übersättigung des Mischkristalls Austenit und einem höheren Ausscheidungspotential für Karbonitride aus dem Austenit.Conventional slabs are subjected to the polymorphic conversions when used cold before being formed in a conventional rolling mill: Melt → Ferrite (Delta) → Austenite A 1 (Gamma) → Ferrite (Alpha) → Austenite A 2 (Gamma) while for CSP technology: Melt → Ferrite (Delta) → Austenite A 1 (Gamma) with a higher supersaturation of the austenite mixed crystal and a higher precipitation potential for carbonitrides from the austenite.

Um die Besonderheiten der Gefügeentwicklung beim thermomechanischen Walzen in CSP-Anlagen optimal zu nutzen, wird in der nicht vorveröffentlichten deutschen Patentanmeldung Nr . 19725434.9-24 zur Anpassung an die thermische Vorgeschichte der in der CSP-Walzanlage mit Gussgefüge eingeführten Dünnbrammen vorgeschlagen, die bei der thermomechanischen ersten Umformung einsetzende Rekristallisation des Gussgefüges vollständig ablaufen zu lassen, bevor eine weitere Umformung erfolgt . Durch diese Maßnahme sowie durch Einstellung definierter Temperatur- und Formänderungsbedingungen wird eine kontrollierte Gefügeentwicklung beim Walzgut bei seinem Durchlauf durch die CSP-Anlage erreicht und das thermomechanische Umformen in optimaler Weise auf die spezifischen Verfahrensparameter des CSP-Verfahrens mit seiner spezifischen thermischen Vorgeschichte ausgerichtet.To the peculiarities of the development of the microstructure make optimal use of thermomechanical rollers in CSP systems, is in the unpublished German Patent application no. 19725434.9-24 to adapt to the thermal history of the in the CSP rolling mill with Cast iron structure imported thin slabs proposed at the thermomechanical first forming The recrystallization of the cast structure runs off completely before further forming. Through this Measure and by setting defined temperature and Deformation conditions become a controlled Microstructure development of the rolling stock as it passes through the CSP plant reached and the thermomechanical forming in optimally on the specific process parameters of the CSP process with its specific thermal Previous history aligned.

Aufgabe der Erfindung ist es, die bei den Verfahrensschritten der deutschen Patentanmeldung Nr. 19725434.9-24 erreichte Festigkeitsentwicklung durch geeignete Maßnahmen weiter zu steigern, so dass sichergestellt ist, dass die im CSP-Prozess hergestellten mikrolegierten ferritisch-perlitischen Baustähle höchster Festigkeitsklasse mit Streckgrenzen ≥ 480 MPa entsprechen und durch diese Maßnahmen CSP-Anlage, CSP-Verfahren und verarbeiteter Werkstoff noch weiter optimal aufeinander abgestimmt werden. The object of the invention is that in the process steps German Patent Application No. 19725434.9-24 reached Strength development continues through suitable measures increase so that it is ensured that the in the CSP process manufactured microalloyed ferritic-pearlitic structural steels highest strength class with yield strengths ≥ 480 MPa correspond and through these measures CSP facility, CSP process and processed material still optimal be coordinated.

Die gestellte Aufgabe wird verfahrensmäßig durch die kennzeichnenden Maßnahmen des Anspruchs 1 dadurch gelöst, dass zur Herstellung von hoch festen mikrolegierten Baustählen mit einer Streckgrenze von ≥ 480 MPa zur Erreichung eines optimalen Eigenschaftkomplexes bezüglich Festigkeit und Zähigkeit der Baustähle die verfügbaren Verfestigungsmechanismen komplex genutzt werden, in dem zusätzlich zum thermomechanischen Walzen mit den Verfahrensschritten der deutschen Patentanmeldung Nr. 19725434.9-24 eine weitere Gefügebeeinflussung in der Dünnbramme durch eine Anderung der Werkstoffzusammensetzung herbeigeführt wird, durch die

  • a) eine gezielte Mischkristallverfestigung durch einen erhöhten Siliciumgehalt und/oder
  • b) eine komplexe Mischkristallverfestigung durch einen erhöhten Gehalt an Kupfer, Chrom, Nickel
    erzielt wird.
    • The problem is solved procedurally by the characterizing measures of claim 1 in that the available hardening mechanisms are used in a complex manner in order to produce high-strength microalloyed structural steels with a yield strength of ≥ 480 MPa in order to achieve an optimal property complex with regard to strength and toughness of the structural steels In addition to thermomechanical rolling with the process steps of German patent application No. 19725434.9-24, a further structural influence in the thin slab is brought about by a change in the material composition, by which
  • a) a targeted solid solution strengthening by an increased silicon content and / or
  • b) a complex solid solution strengthening through an increased content of copper, chromium, nickel
    is achieved.

    • Durch die Maßnahme der Erfindung werden somit bekannte metallurgisch nutzbare festigkeitssteigernde Wirkmechanismen miteinander kombiniert und ausgerichtet auf das CSP-Verfahren optimal zur Anwendung gebracht.The measure of the invention thus makes known metallurgically usable strength-increasing mechanisms of action combined with each other and geared towards the CSP process optimally applied.

    Es sind dies die festigkeitssteigernden Mechanismen Korngrenzenverfestigung und Ausscheidungshärtung, die unter anderem durch das thermomechanische Walzen mitden Verfahrensschritten der deutschen Patentanmeldung Nr. 19725434. 9-24 günstig beeinflusst werden und die im wesentlichen durch die Mikrolegierungselemente (z. B. Titan, Niob, Vanadin und andere) ausgelöst werden.These are the strengthening mechanisms Grain boundary strengthening and precipitation hardening, which under among other things by thermomechanical rolling Process steps of German patent application no. 19725434. 9-24 can be influenced favorably and the im essentially due to the microalloying elements (e.g. titanium, Niobium, vanadium and others) are triggered.

    Zu diesen festigkeitssteigenden Mechanismen wird nun gemäß der Erfindung zusätzlich in definierter Weise eine Mischkristallverfestigung herbeigeführt.These strength-increasing mechanisms are now in accordance with the Invention in addition in a defined manner Solid crystal solidification brought about.

    Die Mischkristallverfestigung wird in hochfesten ferritisch-perlitischen mikrolegierten Baustählen bevorzugt durch Mangan bewirkt. Es hat sich jedoch gezeigt, dass zur sicheren Gewährleistung von höchsten Streckgrenzen im Bereich von ≥ 480 MPa in CSP-Anlagen die zusätzliche und gezielte Legierung durch weitere Elemente sinnvoll und für höchste Festigkeitsklassen notwendig ist.The solid solution strengthening is in high strength ferritic-pearlitic micro-alloyed structural steels preferred caused by manganese. However, it has been shown that for secure guarantee of the highest yield strengths in the area of ≥ 480 MPa in CSP plants the additional and targeted Alloy makes sense with additional elements and for the highest Strength classes is necessary.

    Insbesondere zwei Aspekte stehen dabei im Vordergrund.

    • Die Mischkristallverfestigung wird der Ausscheidungshärtung ergänzend zur Seite gestellt; dadurch können über das CSP-Verfahren für die Werkstoffgruppe ferritisch-perlitische Baustähle höhere Festigkeitsklassen erschlossen werden.
    • Die Mischkristallverfestigung erfolgt so, z. B. durch das Legierungselement Silicium, dass sie von der Warmumformung selbst weitgehend unberührt bleibt; d. h. beispielsweise nicht zur deformationsinduzierten Ausscheidung führt. Dadurch verhält sich ein solcher Stahl in der Straße ruhiger, da er durch die Umformung selbst schwächer verfestigt; er ist deshalb steuerungstechnisch leichter zu handhaben.
    Two aspects are particularly important.
    • The solid solution strengthening is put to the side of the precipitation hardening; this enables higher strength classes to be developed for the material group ferritic-pearlitic structural steels using the CSP process.
    • The solid solution strengthening takes place, for. B. by the alloying element silicon that it remains largely unaffected by the hot forming itself; ie does not lead to deformation-induced excretion, for example. As a result, such steel behaves more quietly in the street, since it is less solidified by the deformation itself; It is therefore easier to use in terms of control technology.

    Aus dieser Sicht kommen neben Mangan noch folgende Legierungselemente mit folgenden Gehalten erfindungsgemäß in Frage:

  • Silicium mit 0,41 bis 0,60 %
  • Kupfer mit 0,11 bis 0,30 %
  • Chrom mit 0,20 bis 0,60 %
  • Nickel mit 0,10 bis 0,60 %
    • From this point of view, in addition to manganese, the following alloy elements with the following contents are also possible according to the invention:
  • Silicon with 0.41 to 0.60%
  • Copper with 0.11 to 0.30%
  • Chromium with 0.20 to 0.60%
  • Nickel with 0.10 to 0.60%

    • Der Zusatz von Kupfer in den genannten Mengen bewirktneben der Mischkristallverfestigung bei Überschreitung der Löslichkeitsgrenze im Ferrit, aber nicht im Austenit, während der Umformung eine zusätzliche Ausscheidungshärtung durch ε - Cu. Dabei ist jedoch zu beachten, dass häufig Kupfer gemeinsam mit Nickel zur Anwendung kommen muss, um Lötbruch vorzubeugen. Erfolgt die Stahlherstellung über eine Linie mit einem Elektrolichtbogenofen (EAF) und einem Pfannenofen (LMF), dann hat man häufig bereits zwangsläufig Kupfer vorliegen. Nach bekannten Empfehlungen sollte der Kupfergehalt einen Betrag von 0,1 % dabei nicht überschreiten. Es hat sich jedoch gezeigt, dass für die Werkstoffgruppe hochfester Baustähle dieser Wert bis auf einen Betrag von 0,3 % Kupfer gesteigert werden kann, um so eine zusätzliche Mischkristallverfestigung zu erreichen.The addition of copper in the amounts mentioned has the following effects the solid solution strengthening when the Solubility limit in ferrite, but not in austenite, during an additional precipitation hardening by ε - Cu. However, it should be noted that copper is common with nickel must be used to prevent solder breakage. If the steel production takes place via a line with a Electric arc furnace (EAF) and a ladle furnace (LMF), then often you already have copper. After Known recommendations should include an amount of copper not exceed 0.1%. However, it has demonstrated that for the material group of high-strength structural steels this value increased to an amount of 0.3% copper an additional solid solution strengthening to reach.

    Bei der Stahlherstellung über eine Linie mit einem Sauerstoff-Blasofen (BOF) und einem Pfannenofen lässt sich grundsätzlich gleichfalls ein derart hoher Kupfergehalt zulegieren. Dies führt aber zu dem Nachteil, dass Flexibilität insofern eingebüßt wird, dass ein Herunterblasen der einmal Kupfer-legierten Pfanne nicht mehr möglich ist, was z. B. bei Produktionsstörungen oder bei einem alternativen Einsatz einer bereits hergestellten Pfanne wünschenswert wäre.When making steel using a line with a Oxygen blow furnace (BOF) and a ladle furnace can be basically also such a high copper content alloy. However, this leads to the disadvantage that flexibility to the extent that a blow down of the once Copper alloy pan is no longer possible, which z. B. at Production disruptions or when using an alternative already prepared pan would be desirable.

    Anders ist die Situation durch Zusatz von Chrom, Nickel und Silicium, da diese Elemente alle im Sauerstoff-Blasofen einstellbar sind. Deshalb bietet sich als Alternative zum Kupferzusatz der Zusatz von Nickel allein und/oder Chrom und/oder Silicium an, um die gewünschte Mischkristallverfestigung zu erreichen.The situation is different due to the addition of chromium, nickel and Silicon since these elements are all in the oxygen blow furnace are adjustable. Therefore, it is an alternative to Copper addition the addition of nickel alone and / or chromium and / or silicon to the desired To achieve solid solution strengthening.

    Nachfolgend wird an einem Beispiel die Mischkristallverfestigung näher erläutert.The following is an example Mixed crystal strengthening explained in more detail.

    Ein mikrolegierter Baustahl mit der Zusammensetzung in Gewichtsprozent: C < 0,07; Mn = 1,3; Si ≤ 0,35; Cu ≤ 0,05; Ni ≤ 0,05; Cr ≤ 0,05; Mo ≤ 0,05; Nb = 0,02; V = 0,08; N = 180 ppm erreichte bei der thermomechanischen Behandlung mit den Verfahrensschritten der deutschen Patentanmeldung Nr. 19725434.9-24 folgende Eigenschaften: Streckgrenze 480 MPa, Zugfestigkeit 570 MPa, Dehnung 21 %.A microalloyed structural steel with the composition in Weight percent: C <0.07; Mn = 1.3; Si ≤ 0.35; Cu ≤ 0.05; Ni ≤ 0.05; Cr ≤ 0.05; Mo ≤ 0.05; Nb = 0.02; V = 0.08; N = 180 ppm achieved in thermomechanical treatment with the Process steps of German patent application no. 19725434.9-24 the following properties: yield strength 480 MPa, Tensile strength 570 MPa, elongation 21%.

    Durch die zusätzliche Mischkristallverfestigung nach erhöhtem Zusatz von Silicium entsprechend der Analyse: C ≤ 0,07; Mn = 1,3; Si = 0,60; Cu ≤ 0,05; Ni ≤ 0,05; Cr ≤ 0,05; Mo ≤ 0,05; Nb = 0,02; V = 0,08; N = 180 ppm und Behandlung gleichfalls nach den Verfahrensschritten der deutschen Patentanmeldung Nr. 19725434.9-24 wurden folgende Eigenschaften erreicht: Streckgrenze 565 MPa, Zugfestigkeit 650 MPa, Dehnung 22 %.Due to the additional solid solution strengthening after increased Addition of silicon according to the analysis: C ≤ 0.07; Mn = 1.3; Si = 0.60; Cu ≤ 0.05; Ni ≤ 0.05; Cr ≤ 0.05; Mo ≤ 0.05; Nb = 0.02; V = 0.08; N = 180 ppm and treatment also after the procedural steps of German patent application no. 19725434.9-24 the following properties were achieved: Yield strength 565 MPa, tensile strength 650 MPa, elongation 22%.

    Durch das Verfahren der Erfindung, zusätzlich zu den Verfahrensschritten der thermomechanischen Behandlung eine Mischkristallverfestigung herbeizuführen, lassen sich also deutliche Festigkeitssteigerungen erzielen, wodurch sich völlig neue Anwendungen für die erzeugten Baustähle erschließen.By the method of the invention, in addition to Process steps of thermomechanical treatment a Solid crystal strengthening can be brought about achieve significant increases in strength, which means completely new applications for the structural steels produced open up.

    In ähnlicher Weise wie im angeführten Beispiel können auch die übrigen erwähnten Legierungselemente Kupfer, Nickel, Chrom als Mischkristallverfestiger eingesetzt werden. Besonders effektiv ist die Festigkeitssteigerung dann, wenn nicht nur mit einem einzelnen der genannten substitionell im Eisen gelösten Elemente legiert wird, sondern ihre komplexe Nutzung in Kombination erfolgt.In a similar way as in the example given, the other alloy elements mentioned copper, nickel, chromium as Mixed crystal solidifiers are used. Particularly effective is the increase in strength if not with just one some of the above-mentioned dissolved in iron Elements are alloyed, but their complex use in Combination is done.

    Claims (5)

    Verfahren zur Herstellung von mikrolegierten Baustählen durch Walzen in einer CSP-Anlage, wobei der gegossene Brammenstrang, geteilt in Walzlängen, über einen Ausgleichsofen einer mehrgerüstigen CSP-Walzstraße zugeführt und dort kontinuierlich zu Warmbreitband ausgewalzt, in einer Kühlstrecke gekühlt und zu Bunden gehaspelt wird, wobei zur Erzielung optimaler mechanischer Eigenschaften beim Durchlauf der Dünnbramme durch die CSP-Anlage eine kontrollierte Gefügeentwicklung durch thermomechanisches Walzen durchgeführt wird mit den in der deutschen Patentanmeldung Nr. 19725434.9-24 beschriebenen Verfahrensschritten, dadurch gekennzeichnet, dass zur Herstellung von hoch festen mikrolegierten Baustählen mit einer Streckgrenze von ≥ 480 MPa zur Erreichung eines optimalen Eigenschaftskomplexes bezüglich Festigkeit und Zähigkeit der Baustähle die verfügbaren Verfestigungsmechanismen komplex genutzt werden, indem zusätzlich zum thermomechanischen Walzen mit den Verfahrensschritten der Patentanmeldung Nr. 19725434.9-24 eine weitere Gefügebeeinflussung in der Dünnbramme durch eine Änderung der Werkstoffzusammensetzung herbeigeführt wird, durch die a) eine gezielte Mischkristallverfestigung durch einen erhöhten Siliciumgehalt und/oder b) eine komplexe Mischkristallverfestigung durch einen erhöhten Gehalt an Kupfer, Chrom, Nickel
    erzielt wird.         Process for the production of microalloyed structural steels by rolling in a CSP system, the cast slab strand, divided into rolling lengths, being fed via a compensating furnace to a multi-stand CSP rolling mill, where it is continuously rolled into hot wide strip, cooled in a cooling section and coiled, whereby To achieve optimal mechanical properties when the thin slab passes through the CSP system, a controlled microstructural development by thermomechanical rolling is carried out using the process steps described in German patent application No. 19725434.9-24, characterized in that for the production of high-strength microalloyed structural steels with a yield point of ≥ 480 MPa to achieve an optimal property complex with regard to the strength and toughness of the structural steels, the available hardening mechanisms can be used in a complex manner, in addition to the thermomechanical rolling with the process steps itten the patent application no. 19725434.9-24 a further structural influence in the thin slab is brought about by a change in the material composition, by which a) a targeted solid solution strengthening by an increased silicon content and / or b) a complex solid solution strengthening through an increased content of copper, chromium, nickel
    is achieved.     Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die erhöhten Gehalte in den folgenden Bereichen liegen: Silicium = 0,41 bis 0,60 % Kupfer = 0,11 bis 0,30 % Chrom = 0,20 bis 0,60 % Nickel = 0,10 bis 0,60 % A method according to claim 1, characterized in that the increased contents are in the following ranges: Silicon = 0.41 to 0.60% Copper = 0.11 to 0.30% Chromium = 0.20 to 0.60% Nickel = 0.10 to 0.60% Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass durch entsprechende Wahl der Art und der Menge der zugesetzten Elemente die Mischkristallverfestigung der Ausscheidungshärtung, die während des Durchlaufs der Dünnbramme durch die CSP-Anlage stattfindet, ergänzend zur Seite gestellt wird.A method according to claim 1 or 2, characterized in that the solid solution strengthening of the precipitation hardening, which takes place during the passage of the thin slab through the CSP system, is additionally set aside by appropriate choice of the type and the amount of the elements added. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Mischkristallverfestigung durch entsprechende Wahl der Art und der Menge der zugesetzten Elemente, z. B. durch das Legierungselement Silicium, so erfolgt, dass sie von der Wärmumformung selbst weitgehend unberührt bleibt und somit nicht zu deformationsinjizierten Ausscheidungen führt.A method according to claim 1 or 2, characterized in that the solid solution strengthening by appropriate choice of the type and amount of elements added, for. B. by the alloying element silicon, so that it remains largely unaffected by the heat deformation itself and thus does not lead to deformation-injected excretions. Mikrolegierte hochfeste Baustähle nach dem Verfahren der Ansprüche 1, 2, 3 oder 4, dadurch gekennzeichnet, dass ihre Werkstoffzusammensetzung einschließlich der die Mischkristallverfestigung hergeiführenden Zusätze der Legierungselemente Silicium und/oder Kupfer, Chrom, Nickel so festgelegt ist, dass die in der CSP-Anlage, insbesondere in der Walzstraße zur Verfügung stehende Durchlaufzeit, die aufgrund der kompakten Bauweise und des hohen Durchsatzes der CSP-Walzstraße sehr kurz ist, ausreicht, die gewünschten festigkeitssteigernden Festkörperreaktionen einschließlich der Mischkristallverfestigung während des thermomechanischen Walzens und während der Rekristallisationsphasen ablaufen zu lassen.Microalloyed high-strength structural steels according to the process of claims 1, 2, 3 or 4, characterized in that their material composition including the addition of the alloying elements silicon and / or copper, chromium, nickel which brings about solidification of the solid solution is determined in such a way that that in the CSP system , in particular the throughput time available in the rolling mill, which is very short due to the compact design and the high throughput of the CSP rolling mill, is sufficient to allow the desired strength-increasing solid-state reactions including solid-solution hardening to take place during thermomechanical rolling and during the recrystallization phases.
    EP99104265A 1998-03-31 1999-03-03 Method of manufacturing micro-alloyed construction steels Expired - Lifetime EP0947590B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19814223 1998-03-31
    DE19814223A DE19814223A1 (en) 1998-03-31 1998-03-31 Process for the production of microalloyed structural steels

    Publications (2)

    Publication Number Publication Date
    EP0947590A1 true EP0947590A1 (en) 1999-10-06
    EP0947590B1 EP0947590B1 (en) 2008-10-29

    Family

    ID=7862994

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP99104265A Expired - Lifetime EP0947590B1 (en) 1998-03-31 1999-03-03 Method of manufacturing micro-alloyed construction steels

    Country Status (8)

    Country Link
    US (1) US6231696B1 (en)
    EP (1) EP0947590B1 (en)
    AT (1) ATE412781T1 (en)
    BR (1) BR9901027A (en)
    CA (1) CA2267564C (en)
    DE (2) DE19814223A1 (en)
    ES (1) ES2313760T3 (en)
    MX (1) MXPA99002898A (en)

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    WO2006094718A1 (en) * 2005-03-05 2006-09-14 Sms Demag Ag Process and installation for producing a lightweight structural steel with a high manganese content
    CN110317995A (en) * 2019-06-03 2019-10-11 武汉钢铁有限公司 A method of with carbon hot rolled steel plate in the CSP production good thin gauge of surface quality

    Families Citing this family (8)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US6669789B1 (en) 2001-08-31 2003-12-30 Nucor Corporation Method for producing titanium-bearing microalloyed high-strength low-alloy steel
    US20050115649A1 (en) * 2003-03-27 2005-06-02 Tokarz Christopher A. Thermomechanical processing routes in compact strip production of high-strength low-alloy steel
    CN100336617C (en) * 2004-10-25 2007-09-12 广州珠江钢铁有限责任公司 Method for using hot-rolled steel plate to produce and steel cylinder by using continuously casting and rolling thin steel blanket
    CN101147919B (en) * 2007-09-30 2010-10-13 马鞍山钢铁股份有限公司 Method for reducing cold rolled galvanized plate surface defect with CSP hot rolled coil as raw material
    DE102007060472A1 (en) * 2007-12-14 2009-06-18 Mahle International Gmbh Two-piece piston for an internal combustion engine
    DE102015210863A1 (en) 2015-04-15 2016-10-20 Sms Group Gmbh Casting-rolling plant and method for its operation
    CN106381451B (en) * 2016-09-29 2018-04-03 马钢(集团)控股有限公司 A kind of CSP flows production 1000MPa levels hot rolling martensite steel and its production method
    CN111944974B (en) * 2020-07-23 2022-05-03 武汉钢铁有限公司 Method for producing thin-specification strip steel with good surface quality based on CSP (compact strip production) process

    Citations (11)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB2099016A (en) * 1981-02-26 1982-12-01 Nippon Kokan Kk Steel for welding with high heat input
    EP0266564A2 (en) * 1986-11-06 1988-05-11 Sms Schloemann-Siemag Aktiengesellschaft Strip casting installation with a following multiple stand continuous rolling mill
    US4769088A (en) * 1986-02-18 1988-09-06 Nippon Steel Corporation Process for producing hot-rolled steel sheet having high r value
    EP0368048A2 (en) * 1988-11-05 1990-05-16 Sms Schloemann-Siemag Aktiengesellschaft Method and device for manufacturing hot-rolled steel strip
    EP0429094A1 (en) * 1984-01-20 1991-05-29 KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd. High strength low carbon steels, steel articles thereof and method for manufacturing the steels
    EP0449004A2 (en) * 1990-03-28 1991-10-02 Sms Schloemann-Siemag Aktiengesellschaft Method and installation for manufacturing hot-rolled steel strip, in particular for special steels from a continuously cast material
    EP0535238A1 (en) * 1991-03-13 1993-04-07 Kawasaki Steel Corporation High-strength steel sheet for forming and production thereof
    EP0593001A1 (en) * 1992-10-13 1994-04-20 Sms Schloemann-Siemag Aktiengesellschaft Method and device for making hot-rolled strips or beams from continuously cast material
    EP0595282A1 (en) * 1992-10-28 1994-05-04 Sms Schloemann-Siemag Aktiengesellschaft Method and installation for manufacturing hot-rolled steel strip, in particular from a continuously cast material
    EP0666122A1 (en) * 1994-01-27 1995-08-09 Sms Schloemann-Siemag Aktiengesellschaft Method and installation for manufacturing hot-rolled steel strip from a continuously cast material
    US5622572A (en) * 1995-08-28 1997-04-22 Newport News Shipbuilding And Dry Dock Company Extra-strength steel and method of making

    Family Cites Families (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4619714A (en) * 1984-08-06 1986-10-28 The Regents Of The University Of California Controlled rolling process for dual phase steels and application to rod, wire, sheet and other shapes
    DE3926459A1 (en) * 1989-08-10 1991-02-14 Schloemann Siemag Ag METHOD AND SYSTEM FOR THE PRODUCTION OF THERMOMECHANICALLY TREATED ROLLED STEEL
    US5393358A (en) * 1990-12-03 1995-02-28 Nkk Corporation Method for producing abrasion-resistant steel having excellent surface property
    DE19725434C2 (en) 1997-06-16 1999-08-19 Schloemann Siemag Ag Process for rolling hot wide strip in a CSP plant

    Patent Citations (11)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB2099016A (en) * 1981-02-26 1982-12-01 Nippon Kokan Kk Steel for welding with high heat input
    EP0429094A1 (en) * 1984-01-20 1991-05-29 KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd. High strength low carbon steels, steel articles thereof and method for manufacturing the steels
    US4769088A (en) * 1986-02-18 1988-09-06 Nippon Steel Corporation Process for producing hot-rolled steel sheet having high r value
    EP0266564A2 (en) * 1986-11-06 1988-05-11 Sms Schloemann-Siemag Aktiengesellschaft Strip casting installation with a following multiple stand continuous rolling mill
    EP0368048A2 (en) * 1988-11-05 1990-05-16 Sms Schloemann-Siemag Aktiengesellschaft Method and device for manufacturing hot-rolled steel strip
    EP0449004A2 (en) * 1990-03-28 1991-10-02 Sms Schloemann-Siemag Aktiengesellschaft Method and installation for manufacturing hot-rolled steel strip, in particular for special steels from a continuously cast material
    EP0535238A1 (en) * 1991-03-13 1993-04-07 Kawasaki Steel Corporation High-strength steel sheet for forming and production thereof
    EP0593001A1 (en) * 1992-10-13 1994-04-20 Sms Schloemann-Siemag Aktiengesellschaft Method and device for making hot-rolled strips or beams from continuously cast material
    EP0595282A1 (en) * 1992-10-28 1994-05-04 Sms Schloemann-Siemag Aktiengesellschaft Method and installation for manufacturing hot-rolled steel strip, in particular from a continuously cast material
    EP0666122A1 (en) * 1994-01-27 1995-08-09 Sms Schloemann-Siemag Aktiengesellschaft Method and installation for manufacturing hot-rolled steel strip from a continuously cast material
    US5622572A (en) * 1995-08-28 1997-04-22 Newport News Shipbuilding And Dry Dock Company Extra-strength steel and method of making

    Cited By (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    WO2006094718A1 (en) * 2005-03-05 2006-09-14 Sms Demag Ag Process and installation for producing a lightweight structural steel with a high manganese content
    CN101160183B (en) * 2005-03-05 2011-07-06 Sms西马格股份公司 Process and installation for producing a lightweight structural steel with a high manganese content
    CN110317995A (en) * 2019-06-03 2019-10-11 武汉钢铁有限公司 A method of with carbon hot rolled steel plate in the CSP production good thin gauge of surface quality
    CN110317995B (en) * 2019-06-03 2020-08-25 武汉钢铁有限公司 Method for producing thin medium-carbon hot-rolled steel plate with good surface quality by using CSP (cast Steel plate)

    Also Published As

    Publication number Publication date
    BR9901027A (en) 2000-01-25
    EP0947590B1 (en) 2008-10-29
    MXPA99002898A (en) 2005-05-26
    ES2313760T3 (en) 2009-03-01
    US6231696B1 (en) 2001-05-15
    CA2267564A1 (en) 1999-09-30
    DE59914885D1 (en) 2008-12-11
    DE19814223A1 (en) 1999-10-07
    CA2267564C (en) 2009-07-07
    ATE412781T1 (en) 2008-11-15

    Similar Documents

    Publication Publication Date Title
    EP3332047B1 (en) Production method of a flexibly-rolled steel sheet product and its use
    EP2690183B1 (en) Hot-rolled steel flat product and method for its production
    EP2383353B1 (en) High tensile steel containing Mn, steel surface product made from such steel and method for producing same
    EP3332046B1 (en) High-tensile manganese steel containing aluminium, method for producing a sheet-steel product from said steel and sheet-steel product produced according to this method
    EP3504349B1 (en) Method for producing a high-strength steel strip with improved properties for further processing, and a steel strip of this type
    EP3535431B1 (en) Steel product with an intermediate manganese content for low temperature application and production method thereof
    DE102005051052A1 (en) Process for the production of hot strip with multiphase structure
    DE60300561T3 (en) Process for producing a hot-rolled steel strip
    EP2690184A1 (en) Produit plat en acier laminé à froid et son procédé de fabrication
    WO2017016582A1 (en) High-strength steel having a high minimum yield limit and method for producing a steel of this type
    DE102018132860A1 (en) Process for the production of conventionally hot-rolled, profiled hot-rolled products
    EP3512968B1 (en) Method for producing a flat steel product made of a manganese-containing steel, and such a flat steel product
    EP0947590A1 (en) Method of manufacturing micro-alloyed construction steels
    EP1398390B1 (en) Steel with a very fine ferritic and martensitic microstructure having a high tensile strength
    EP2356262B1 (en) Method and apparatus for producing steel pipes having particular properties
    DE112006003553T5 (en) Thick steel plate for a welded construction having excellent strength and toughness in a central region of thickness and small property changes by its thickness and production process therefor
    WO2018050637A1 (en) Method for producing a hot or cold strip and/or a flexibly rolled flat steel product made of a high-strength manganese steel and flat steel product produced by said method
    WO2020201352A1 (en) Hot-rolled flat steel product and method for the production thereof
    EP3924526A1 (en) Method for producing thermo-mechanically produced hot-rolled strip products
    WO2017211952A1 (en) Method for producing a cold-rolled steel strip having trip-characteristics made of a high-strength mangan-containing steel
    EP1396549A1 (en) Process for manufacturing hot rolled pearlite-free steel strip and hot strip obtained thereby
    DE102018132901A1 (en) Process for the production of conventionally hot rolled hot rolled products
    DE102018132816A1 (en) Process for the production of thermo-mechanically produced profiled hot-rolled products
    EP3783120B1 (en) Spring wire, clamp formed from same and method for producing such a spring wire
    DE2049916A1 (en) Steel alloy

    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

    17P Request for examination filed

    Effective date: 19990323

    AK Designated contracting states

    Kind code of ref document: A1

    Designated state(s): AT DE ES FR GB IT NL SE

    AX Request for extension of the european patent

    Free format text: AL;LT;LV;MK;RO;SI

    RAP1 Party data changed (applicant data changed or rights of an application transferred)

    Owner name: SMS DEMAG AG

    AKX Designation fees paid

    Free format text: AT DE ES FR GB IT NL SE

    17Q First examination report despatched

    Effective date: 20020221

    APBN Date of receipt of notice of appeal recorded

    Free format text: ORIGINAL CODE: EPIDOSNNOA2E

    APBR Date of receipt of statement of grounds of appeal recorded

    Free format text: ORIGINAL CODE: EPIDOSNNOA3E

    APAF Appeal reference modified

    Free format text: ORIGINAL CODE: EPIDOSCREFNE

    APBT Appeal procedure closed

    Free format text: ORIGINAL CODE: EPIDOSNNOA9E

    GRAP Despatch of communication of intention to grant a patent

    Free format text: ORIGINAL CODE: EPIDOSNIGR1

    GRAS Grant fee paid

    Free format text: ORIGINAL CODE: EPIDOSNIGR3

    GRAA (expected) grant

    Free format text: ORIGINAL CODE: 0009210

    AK Designated contracting states

    Kind code of ref document: B1

    Designated state(s): AT DE ES FR GB IT NL SE

    REG Reference to a national code

    Ref country code: GB

    Ref legal event code: FG4D

    Free format text: NOT ENGLISH

    REF Corresponds to:

    Ref document number: 59914885

    Country of ref document: DE

    Date of ref document: 20081211

    Kind code of ref document: P

    REG Reference to a national code

    Ref country code: SE

    Ref legal event code: TRGR

    REG Reference to a national code

    Ref country code: ES

    Ref legal event code: FG2A

    Ref document number: 2313760

    Country of ref document: ES

    Kind code of ref document: T3

    RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

    Owner name: SMS SIEMAG AG

    NLT2 Nl: modifications (of names), taken from the european patent patent bulletin

    Owner name: SMS SIEMAG AG

    Effective date: 20090617

    PLBE No opposition filed within time limit

    Free format text: ORIGINAL CODE: 0009261

    STAA Information on the status of an ep patent application or granted ep patent

    Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

    26N No opposition filed

    Effective date: 20090730

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: GB

    Payment date: 20130321

    Year of fee payment: 15

    Ref country code: FR

    Payment date: 20130408

    Year of fee payment: 15

    Ref country code: ES

    Payment date: 20130326

    Year of fee payment: 15

    Ref country code: SE

    Payment date: 20130321

    Year of fee payment: 15

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: NL

    Payment date: 20130320

    Year of fee payment: 15

    REG Reference to a national code

    Ref country code: NL

    Ref legal event code: V1

    Effective date: 20141001

    REG Reference to a national code

    Ref country code: SE

    Ref legal event code: EUG

    GBPC Gb: european patent ceased through non-payment of renewal fee

    Effective date: 20140303

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: SE

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20140304

    REG Reference to a national code

    Ref country code: FR

    Ref legal event code: ST

    Effective date: 20141128

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: FR

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20140331

    Ref country code: GB

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20140303

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: NL

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20141001

    REG Reference to a national code

    Ref country code: ES

    Ref legal event code: FD2A

    Effective date: 20150424

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: ES

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20140304

    REG Reference to a national code

    Ref country code: DE

    Ref legal event code: R082

    Ref document number: 59914885

    Country of ref document: DE

    Representative=s name: HEMMERICH & KOLLEGEN, DE

    Ref country code: DE

    Ref legal event code: R081

    Ref document number: 59914885

    Country of ref document: DE

    Owner name: SMS GROUP GMBH, DE

    Free format text: FORMER OWNER: SMS SIEMAG AKTIENGESELLSCHAFT, 40237 DUESSELDORF, DE

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: DE

    Payment date: 20180322

    Year of fee payment: 20

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: AT

    Payment date: 20180322

    Year of fee payment: 20

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: IT

    Payment date: 20180327

    Year of fee payment: 20

    REG Reference to a national code

    Ref country code: DE

    Ref legal event code: R071

    Ref document number: 59914885

    Country of ref document: DE

    REG Reference to a national code

    Ref country code: AT

    Ref legal event code: MK07

    Ref document number: 412781

    Country of ref document: AT

    Kind code of ref document: T

    Effective date: 20190303