EP0030309A2 - Feuillard à chaud ou tôle forte en acier dénitruré et procédé pour sa fabrication - Google Patents

Feuillard à chaud ou tôle forte en acier dénitruré et procédé pour sa fabrication Download PDF

Info

Publication number
EP0030309A2
EP0030309A2 EP80107296A EP80107296A EP0030309A2 EP 0030309 A2 EP0030309 A2 EP 0030309A2 EP 80107296 A EP80107296 A EP 80107296A EP 80107296 A EP80107296 A EP 80107296A EP 0030309 A2 EP0030309 A2 EP 0030309A2
Authority
EP
European Patent Office
Prior art keywords
temperature
steel
hot strip
heavy plate
intermediate temperature
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
EP80107296A
Other languages
German (de)
English (en)
Other versions
EP0030309B1 (fr
EP0030309A3 (en
Inventor
Klaus Dipl.-Ing. Freier
Constantin M. Dr.-Ing. Vlad
Klaus Dipl.-Ing. Hulka
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.)
Stahlwerke Pein Salzgitter AG
Preussag Stahl AG
Original Assignee
Stahlwerke Pein Salzgitter AG
Preussag Stahl 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25782269&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0030309(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19792949124 external-priority patent/DE2949124C2/de
Priority claimed from DE19803030060 external-priority patent/DE3030060A1/de
Application filed by Stahlwerke Pein Salzgitter AG, Preussag Stahl AG filed Critical Stahlwerke Pein Salzgitter AG
Publication of EP0030309A2 publication Critical patent/EP0030309A2/fr
Publication of EP0030309A3 publication Critical patent/EP0030309A3/de
Application granted granted Critical
Publication of EP0030309B1 publication Critical patent/EP0030309B1/fr
Expired 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
    • C21D8/0221—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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling

Definitions

  • the invention relates to a method for producing hot strip or heavy plate from a denitrified steel.
  • the invention further relates to hot strip or heavy plate made from denitrated steel.
  • thermo-mechanical treatment of steels means a controlled reshaping of the steel in a temperature range around the transformation point Ar 3 with a controlled precipitation and / or transformation of the structure at the same time.
  • thermo-mechanically treated steels In the mechanical-technological testing of these steels, especially in the presence of notches in a wide temperature range above the complete brittle fracture (Charpy impact test), tears are often observed perpendicular to the fracture surface (referred to as “separation”, “splitting” or “splitting”).
  • This tendency to split the fracture surfaces of thermo-mechanically treated steels is important, for example, for the operation of long-distance pipelines because it reduces the ability of these steels to stop the propagation of tough fractures.
  • Proposals have already been made for the production of high-strength steels for long-distance pipelines, in which fracture splitting no longer occurs in the impact strength test, but all of which are associated with high alloy costs and high production costs.
  • the object of the invention is to achieve an increased notched impact strength even at low temperatures (i.e. CVN transition temperature T050 of at least minus 30 ° C.) by controlling the occurrence of the separation in a hot-rolled hot strip or heavy plate.
  • the steel with the composition carbon 0.04 to 0.16%, manganese 1.25 to 1.90%, silicon 0.02 to 0.55%, phosphorus 0.004 to 0.020%, sulfur 0.002 to 0.015%, aluminum 0.02 to 0.08%, niobium 0.02 to 0.08%, remainder iron and any impurities is subjected to a hot rolling process in which the hot strip or sheet metal is the last finishing stand with a temperature of 750 Leaves ° to 820 ° C and cooled at a cooling rate of 2 ° to 10 ° C / s to an intermediate temperature of 450 ° C to 570 ° C and is coiled at this temperature or cooled in a stack.
  • the method according to the invention can thus significantly improve the usability of the steel, for example for large pipe pipelines, without the need for excessive alloy additives.
  • vanadium 0.02 to 0.10% has a particularly favorable effect on the increase in the strength properties of a steel according to the invention, since the vanadium precipitates mainly in the ferrite grain and not on Grain boundaries takes place.
  • the steel has a ferritic-pearlitic structure and the ratio of Cvmax to C v 100 is between 1.0 and 1.3.
  • C v 100 denotes the high notch impact value (highest values) at which the samples are still showing a 100% deformation fracture.
  • C V max is the temperature-dependent value that has the highest impact value of the entire test.
  • the steel produced according to the invention has a complete absence of fracture splits in the CVN impact test (CVN-Charpy-V-Notch) while at the same time ensuring CVN transition temperatures of at least -30 ° C.
  • the steel of the composition mentioned has a reduced number of separations. Nevertheless, it still has a significantly higher notched impact strength.
  • the notched impact strength test of hot strip and / or sheet metal with separations it was found that the notched impact strength in J / cm 2 decreases with increasing number of "separations" in the fracture surfaces of the CVN samples.
  • the reason for this decrease in impact strength lies in the fact that the separations that run perpendicular to the main fracture surface and parallel to the sample surface mainly occur before they pass through the main crack, as can be seen in Figure 1, so that when the samples are bent during the Impact test requires less energy to initiate the necking start.
  • Such a material is obtained by maintaining an intermediate temperature of 500 to 570 ° C.
  • the intermediate temperature is 550 ° to 620 ° C
  • the temperature on the last finishing stand from 750 ° C to 850 ° C can be.
  • FIGS. 2 and 3 clearly show the advantages of reducing the number of "separations" in the impact test.
  • the notched impact strength increases on average from 150 J / cm 2 to 230 J / cm 2 for those with molybdenum, chromium or nickel alloys alloyed steels of grade X 70 (Fig. 3) and from 160 J / cm 2 to 280 J / cm 2 for niobium-vanadium steels of grade X 70 (Fig. 2), which increased the impact strength by 53 and 75 respectively % corresponds.
  • the temperature at which the hot strip or sheet leaves the last finishing stand during hot rolling need not be quite as narrow for a low-separation steel according to the invention as for the production of a separation-free steel.
  • a temperature range from 750 ° to 850 ° C is possible.
  • additions of 0.002 to 0.08 zirconium and / or 0.004 to 0.051 cerium can also be used when carrying out the new process with an intermediate temperature of 550 ° to 620 ° C.
  • the composition of the steels is shown in Table 6, in which the proportions of the constituents contained in the steel in Percent. Are given. The numbers of the melts are only used to identify the steel.
  • the steels were manufactured according to the parameters given in Table 7. It shows the initial thickness, the thickness of the rolled steel sheet, the blast furnace temperature, the end temperature of the roll and the temperature after cooling (coiling temperature). In all cases with the exception of sheet A, the steel was wound up. The last column shows the cooling rate from the final roll temperature to the reel temperature in ° C / s. The steel then cools slowly in the reel, for example at a rate of about 0.5 ° C / h.
  • the mechanical-technological properties of the investigated and inventive steels are summarized in Table 8.
  • the letters “L” and “Q” characterize the sample position in relation to the rolling direction, namely "L” a longitudinal sample and “Q” a transverse sample on which the impact test was carried out.
  • the other three columns contain the usual information on the yield strength and tensile strength.
  • the a k value indicates the energy consumption of the steel at various points on the a k curve as a function of the temperature.
  • C V 100 characterizes the lowest temperature at which there is still a complete deformation fracture.
  • C v max characterizes the area of maximum energy absorption
  • TÜ 50 indicates the temperature at which the Charpy-V notch impact specimens according to DIN 50.115 show 50% deformation fracture in the fracture areas in the transition area between brittle fracture and deformation fracture.
  • Tables 1 to 5 relate to low-separation steels according to the invention with a higher notched impact strength
  • Tables 6 to 8 characterize separation-free steels which naturally have a very high notched impact strength.

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)
  • Heat Treatment Of Sheet Steel (AREA)
EP80107296A 1979-12-06 1980-11-22 Feuillard à chaud ou tôle forte en acier dénitruré et procédé pour sa fabrication Expired EP0030309B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2949124 1979-12-06
DE19792949124 DE2949124C2 (de) 1979-12-06 1979-12-06 Warmband oder Grobblech aus denitriertem Stahl und Verfahren zu seiner Herstellung
DE19803030060 DE3030060A1 (de) 1980-08-08 1980-08-08 Warmband oder grobblech aus einem denitrierten stahl und verfahren zu seiner herstellung
DE3030060 1980-08-08

Publications (3)

Publication Number Publication Date
EP0030309A2 true EP0030309A2 (fr) 1981-06-17
EP0030309A3 EP0030309A3 (en) 1982-05-12
EP0030309B1 EP0030309B1 (fr) 1985-02-13

Family

ID=25782269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80107296A Expired EP0030309B1 (fr) 1979-12-06 1980-11-22 Feuillard à chaud ou tôle forte en acier dénitruré et procédé pour sa fabrication

Country Status (4)

Country Link
US (1) US4397697A (fr)
EP (1) EP0030309B1 (fr)
CA (1) CA1149711A (fr)
DE (1) DE3070180D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345206A1 (fr) * 1988-06-01 1989-12-06 MANNESMANN Aktiengesellschaft Procédé de fabrication de tôles fortes
FR2633208A1 (fr) * 1988-06-22 1989-12-29 Vizi Gyorgy Element d'angle pour conteneurs
EP0481575A2 (fr) * 1990-10-19 1992-04-22 Preussag Stahl Aktiengesellschaft Procédé de fabrication de tôles soudables à haute résistance mécanique et leur application
EP3913105A1 (fr) * 2020-05-19 2021-11-24 ThyssenKrupp Steel Europe AG Produit plat en acier et son procédé de fabrication

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59100214A (ja) * 1982-11-29 1984-06-09 Nippon Kokan Kk <Nkk> 厚肉高張力鋼の製造方法
US4662950A (en) * 1985-11-05 1987-05-05 Bethlehem Steel Corporation Method of making a steel plate for construction applications
DE3721641C1 (de) * 1987-07-01 1989-01-12 Thyssen Stahl Ag Verfahren zur Herstellung von Warmband
US5833667A (en) * 1993-03-19 1998-11-10 Venetec International, Inc. Catheter anchoring system
JP3509603B2 (ja) * 1998-03-05 2004-03-22 Ｊｆｅスチール株式会社 靱性に優れた降伏強さが３２５ＭＰａ以上の極厚Ｈ形鋼
TW513486B (en) * 2000-03-02 2002-12-11 Matsushita Electric Ind Co Ltd Color CRT mask frame, a steel sheet used therefor and a manufacturing method for the steel sheet, and a color CRT equipped with the frame

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1271738B (de) * 1960-08-10 1968-07-04 Molybdenum Corp Verfahren zur Verbesserung der physikalischen Eigenschaften von Stahl
DE2037350A1 (de) * 1969-07-30 1971-02-11 Armco Steel Corp , Middletown, Ohio (VStA) Verfahren zur Verbesserung der Zähigkeit und Schweißbarkeit von hochfestem niedrig legiertem Elsengrobblech
US3849209A (en) * 1972-02-01 1974-11-19 Nippon Steel Corp Manufacturing method of high tension, high toughness steel
DE2425624A1 (de) * 1973-05-31 1974-12-19 Uss Eng & Consult Verfahren zum herstellen von warmgewalzten staehlen mit hoher festigkeit und ausserordentlicher zaehigkeit, insbesondere zur verwendung bei minustemperaturen
USRE28790E (en) * 1969-07-16 1976-04-27 Jones & Laughlin Steel Corporation High-strength low-alloy steels having improved formability
DE2605160A1 (de) * 1975-02-10 1976-08-19 Italsider Spa Verfahren zur herstellung von leicht schweissbaren, alterungsfreien stahlblechen
DE2120618B2 (de) * 1970-05-11 1976-12-02 American Metal Climax, Inc., New York, N.Y. (V.St.A.) Verfahren zur herstellung eines stahles
DE2653847A1 (de) * 1975-11-28 1977-06-08 Centro Speriment Metallurg Stahl mit mechanisch anisotroper struktur und verfahren zu seiner herstellung
JPS52107225A (en) * 1976-03-05 1977-09-08 Sumitomo Metal Ind Ltd Production of high tensile hot rolled steel
JPS52123921A (en) * 1976-04-13 1977-10-18 Nippon Kokan Kk <Nkk> Production of steel plate with high toughness
JPS5433219A (en) * 1977-08-18 1979-03-10 Sumitomo Metal Ind Ltd Manufacture of high tensile non-refined structural steel sheet
JPS5471714A (en) * 1977-11-21 1979-06-08 Nippon Kokan Kk <Nkk> Manufacture of control-rolled high tensile steel with no separation
JPS54137422A (en) * 1978-04-18 1979-10-25 Nippon Kokan Kk <Nkk> Manufacture of extra-low carbon high tensile steel with very high ductility

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704180A (en) * 1968-08-28 1972-11-28 Inland Steel Co Method for producing tough,high strength steel article
JPS5324892B2 (fr) * 1972-10-19 1978-07-24
US3976514A (en) * 1975-02-10 1976-08-24 Nippon Steel Corporation Method for producing a high toughness and high tensil steel
JPS5220322A (en) * 1975-08-08 1977-02-16 Sumitomo Metal Ind Ltd Process for producing a hot rolled steel band having a strong toughnes s and a high strength
JPS52101627A (en) * 1976-02-23 1977-08-25 Sumitomo Metal Ind Ltd Non-tempered shape steel in low temp. toughness
JPS5421917A (en) * 1977-07-20 1979-02-19 Nippon Kokan Kk <Nkk> Method of manufacturing non-quenched high-tensile steel having high toughness
JPS54132421A (en) * 1978-04-05 1979-10-15 Nippon Steel Corp Manufacture of high toughness bainite high tensile steel plate with superior weldability

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1271738B (de) * 1960-08-10 1968-07-04 Molybdenum Corp Verfahren zur Verbesserung der physikalischen Eigenschaften von Stahl
USRE28790E (en) * 1969-07-16 1976-04-27 Jones & Laughlin Steel Corporation High-strength low-alloy steels having improved formability
DE2037350A1 (de) * 1969-07-30 1971-02-11 Armco Steel Corp , Middletown, Ohio (VStA) Verfahren zur Verbesserung der Zähigkeit und Schweißbarkeit von hochfestem niedrig legiertem Elsengrobblech
DE2120618B2 (de) * 1970-05-11 1976-12-02 American Metal Climax, Inc., New York, N.Y. (V.St.A.) Verfahren zur herstellung eines stahles
US3849209A (en) * 1972-02-01 1974-11-19 Nippon Steel Corp Manufacturing method of high tension, high toughness steel
DE2425624A1 (de) * 1973-05-31 1974-12-19 Uss Eng & Consult Verfahren zum herstellen von warmgewalzten staehlen mit hoher festigkeit und ausserordentlicher zaehigkeit, insbesondere zur verwendung bei minustemperaturen
DE2605160A1 (de) * 1975-02-10 1976-08-19 Italsider Spa Verfahren zur herstellung von leicht schweissbaren, alterungsfreien stahlblechen
DE2653847A1 (de) * 1975-11-28 1977-06-08 Centro Speriment Metallurg Stahl mit mechanisch anisotroper struktur und verfahren zu seiner herstellung
JPS52107225A (en) * 1976-03-05 1977-09-08 Sumitomo Metal Ind Ltd Production of high tensile hot rolled steel
JPS52123921A (en) * 1976-04-13 1977-10-18 Nippon Kokan Kk <Nkk> Production of steel plate with high toughness
JPS5433219A (en) * 1977-08-18 1979-03-10 Sumitomo Metal Ind Ltd Manufacture of high tensile non-refined structural steel sheet
JPS5471714A (en) * 1977-11-21 1979-06-08 Nippon Kokan Kk <Nkk> Manufacture of control-rolled high tensile steel with no separation
JPS54137422A (en) * 1978-04-18 1979-10-25 Nippon Kokan Kk <Nkk> Manufacture of extra-low carbon high tensile steel with very high ductility

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN Band 1, Nr. 166, 27. Dezember 1977 Seite 3688C77 & JP - A - 52 - 107225. *
PATENT ABSTRACTS OF JAPAN Band 2, Nr. 24, 16. Februar 1978 Seite 4152C77 & JP - A - 52 - 123921. *
PATENT ABSTRACTS OF JAPAN Band 3, Nr. 59, 19. Mai 1979 Seite 53C46 & JP - A - 54 - 33219. *
PATENT ABSTRACTS OF JAPAN Band 3, Nr. 95, 11. August 1979 Seite 8C55 & JP - A - 54 - 71714. *
PATENT ABSTRACTS OF JAPAN Band 4, Nr. 2, 9. January 1980 Seite 77C69 & JP - A - 54 - 137422. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0345206A1 (fr) * 1988-06-01 1989-12-06 MANNESMANN Aktiengesellschaft Procédé de fabrication de tôles fortes
FR2633208A1 (fr) * 1988-06-22 1989-12-29 Vizi Gyorgy Element d'angle pour conteneurs
BE1004321A4 (fr) * 1988-06-22 1992-11-03 Vizi Gyoergy Element d'angle pour conteneurs.
EP0481575A2 (fr) * 1990-10-19 1992-04-22 Preussag Stahl Aktiengesellschaft Procédé de fabrication de tôles soudables à haute résistance mécanique et leur application
EP0481575A3 (en) * 1990-10-19 1992-08-26 Preussag Stahl Aktiengesellschaft Process for manufacturing weldable high-tensile steel sheets and use of these sheets
EP3913105A1 (fr) * 2020-05-19 2021-11-24 ThyssenKrupp Steel Europe AG Produit plat en acier et son procédé de fabrication

Also Published As

Publication number Publication date
CA1149711A (fr) 1983-07-12
EP0030309B1 (fr) 1985-02-13
US4397697A (en) 1983-08-09
DE3070180D1 (en) 1985-03-28
EP0030309A3 (en) 1982-05-12

Similar Documents

Publication Publication Date Title
DE69828865T2 (de) Hochfestes, hervorragend bearbeitbares kaltgewalztes stahlblech mit hervorragender schlagbeständigkeit
EP2924140B1 (fr) Procédé de génération d&#39;un produit plat en acier haute résistance
DE69829739T2 (de) Verfahren zur herstellung ultrafeinkörnigen warmgewalzten stahlblechs
DE69426763T2 (de) hochfeste, HOCHDEHNBARER ROSTFREIER ZWEI-PHASEN STAHL UND VERFAHREN ZU DESSEN HERSTELLUNG
EP2690183B1 (fr) Produit plat en acier laminé à chaud et son procédé de fabrication
DE69221597T3 (de) Hochfestes warmgewalztes Stahlfeinblech mit niedrigem Strechgrenzenverhältnis und Verfahren zu seiner Herstellung
DE3883051T2 (de) Verfahren zur Herstellung von Stahlblechen mit guter Zähigkeit bei niedrigen Temperaturen.
DE60312038T2 (de) BLECH AUS Cr-HALTIGEM HITZEBESTÄNDIGEM STAHL MIT HERVORRAGENDER BEARBEITBARKEIT UND HERSTELLUNGSVERFAHREN DAFÜR
DE3401406A1 (de) Verfahren zur herstellung von stahlplatten mit hoher zugfestigkeit
DE3851371T2 (de) Warmgewalztes hochfestes Stahlblech mit ausgezeichneter Umformbarkeit.
DE2607646A1 (de) Kaltverformtes und gegluehtes, niedriglegiertes stahlband- und -blechmaterial und verfahren zu seiner herstellung
WO2015117934A1 (fr) Produit en acier plat de résistance élevée ayant une texture à base de bainite et de martensite et procédé de fabrication d&#39;un tel produit en acier plat
DE3012188C2 (fr)
EP0030309B1 (fr) Feuillard à chaud ou tôle forte en acier dénitruré et procédé pour sa fabrication
EP0181583B1 (fr) Procédé pour produire une bande laminée à chaud ayant une structure à deux phases
DE3134532C2 (fr)
DE3000910C2 (fr)
EP1453984B1 (fr) Procede de production de feuillards ou de toles a chaud en acier microallie
EP3719147A1 (fr) Produit en acier plat laminé à chaud et son procédé de fabrication
DE3007560A1 (de) Verfahren zum herstellen von warmgewalztem blech mit niedriger streckspannung, hoher zugfestigkeit und ausgezeichnetem formaenderungsvermoegen
DE3234574C2 (fr)
EP1396550A1 (fr) Procédé pour la fabrication d&#39; une bande à chaud
DE4033700C1 (fr)
DE69832684T2 (de) Verfahren zur herstellung von stahlrohr mit ultrafeinem gefüge
DE2949124C2 (de) Warmband oder Grobblech aus denitriertem Stahl und Verfahren zu seiner Herstellung

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

Kind code of ref document: A2

Designated state(s): DE FR GB IT NL

Designated state(s): DE FR GB IT NL

ITCL It: translation for ep claims filed

Representative=s name: MODIANO & ASSOCIATI S.R.L.

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT NL

17P Request for examination filed

Effective date: 19820407

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT NL

Designated state(s): DE FR GB IT NL

REF Corresponds to:

Ref document number: 3070180

Country of ref document: DE

Date of ref document: 19850328

ET Fr: translation filed
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: HOESCH AG

Effective date: 19851113

Opponent name: THYSSEN STAHL AG

Effective date: 19851108

NLR1 Nl: opposition has been filed with the epo

Opponent name: HOESCH AG

Opponent name: THYSSEN STAHL AG

PLBN Opposition rejected

Free format text: ORIGINAL CODE: 0009273

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

Free format text: STATUS: OPPOSITION REJECTED

27O Opposition rejected

Effective date: 19910109

NLR2 Nl: decision of opposition
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19921010

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: 19921016

Year of fee payment: 13

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19921130

Year of fee payment: 13

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

Ref country code: GB

Effective date: 19931122

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

Ref country code: NL

Effective date: 19940601

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19931122

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

Ref country code: FR

Effective date: 19940729

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: 19991112

Year of fee payment: 20

APAH Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNO