EP1109942A1 - Method for producing cold-rolled bands or sheets - Google Patents

Method for producing cold-rolled bands or sheets

Info

Publication number
EP1109942A1
EP1109942A1 EP99968685A EP99968685A EP1109942A1 EP 1109942 A1 EP1109942 A1 EP 1109942A1 EP 99968685 A EP99968685 A EP 99968685A EP 99968685 A EP99968685 A EP 99968685A EP 1109942 A1 EP1109942 A1 EP 1109942A1
Authority
EP
European Patent Office
Prior art keywords
cold
rolled
steels
temperature
band
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
EP99968685A
Other languages
German (de)
French (fr)
Other versions
EP1109942B1 (en
Inventor
Bernhard Engl
Klaus Dieter Horn
Klaus Dieter Schmidt
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp 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
Application filed by ThyssenKrupp Stahl AG filed Critical ThyssenKrupp Stahl AG
Publication of EP1109942A1 publication Critical patent/EP1109942A1/en
Application granted granted Critical
Publication of EP1109942B1 publication Critical patent/EP1109942B1/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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • 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
    • 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
    • C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • 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
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C21D8/0236—Cold rolling

Definitions

  • the invention relates to a method for producing cold-rolled strips or sheets from low-alloy steel, each with a max. 0.2% C, P, AI, Ti, V, Nb, S, B and each max. 1% Si and Mn, balance iron and unavoidable impurities. After melting, the steel is turned into slabs, thin slabs or strip, usually in the
  • the level of the annealing temperature required for complete recrystallization of the cold-rolled strip or sheet can be in the preliminary stages of
  • the recrystallization temperature can be reduced by means of a high hot strip coiling temperature and a high degree of cold rolling.
  • the invention is based on the object of reducing the manufacturing outlay and the associated manufacturing costs for producing a completely recrystallized cold-rolled strip or sheet.
  • the invention is based on the surprising finding that complete recrystallization of the cold-rolled strip or sheet can take place at a relatively low temperature which is almost independent of the degree of cold rolling, by means of a lowered hot-rolling final temperature and a low coiling temperature.
  • a low temperature for recrystallization annealing saves energy and costs.
  • the steels can contain up to 0.01% nitrogen and the amount of boron (> 0.78 x N) required for nitrogen removal.
  • small amounts of other alloying elements which are the
  • the hot rolling end temperature should preferably be about 50 ° C below Ar 3 and the coiling temperature preferably in the range of 300 to 600 ° C.
  • the coiling temperature preferably in the range of 300 to 600 ° C.
  • Table 1 shows the chemical compositions of four deep-drawing steels A to D.
  • Figures 1 to 5 each contain the hot rolling and annealing conditions.

Landscapes

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

Abstract

The present invention concerns a method for the production of cold-rolled bands or sheets from low-alloy steel with a maximum of 0.2 % C, Al, Ti, V, Nd respectively and a maximum of 1 % Si and Mn respectively, in addition to a portion of boron required for N binding (⊃ 0,78 x N), the remainder being constituted by iron and unavoidable impurities, wherein said steel is cast after melting to slabs, thin slabs or a band, which are hot-rolled at a starting temperature above 1100° C and at a final temperature below Ar3 and wherein the hot band is then drawn and cold-rolled at a temperature below 650° C, whereupon the cold band is annealed independently of the degree of cold-rolling at a low temperature that could possibly vary depending on the composition of the steel and ranging from 520 to 780° C during a period of time that is sufficiently long to allow for complete recrystallization. The method disclosed makes it possible to simplify manufacturing and to lower production costs associated with the manufacture of a completely recrystallized cold-rolled band or sheet.

Description

Verfahren zur Erzeugung von kaltgewalzten Bändern oder Process for the production of cold rolled strips or
BlechenSheets
Die Erfindung betrifft ein Verfahren zur Erzeugung von kaltgewalzten Bändern oder Blechen aus niedriglegiertem Stahl mit jeweils max. 0,2 % C, P, AI, Ti, V, Nb, S, B und jeweils max. 1 % Si und Mn, Rest Eisen und unvermeidbaren Verunreinigungen. Der Stahl wird in bekannter Weise nach dem Erschmelzen zu Brammen, Dünnbrammen oder Band, in der Regel imThe invention relates to a method for producing cold-rolled strips or sheets from low-alloy steel, each with a max. 0.2% C, P, AI, Ti, V, Nb, S, B and each max. 1% Si and Mn, balance iron and unavoidable impurities. After melting, the steel is turned into slabs, thin slabs or strip, usually in the
Stranggußverfahren, abgegossen und danach warmgewalzt, kaltgewalzt und rekristallisierend geglüht.Continuous casting process, cast and then hot-rolled, cold-rolled and recrystallized annealed.
Die Höhe der für eine vollständige Rekristallisation des kaltgewalzten Bandes oder Bleches erforderliche Glühtemperatur kann in den Vorstufen derThe level of the annealing temperature required for complete recrystallization of the cold-rolled strip or sheet can be in the preliminary stages of
Bandstahlerzeugung beeinflußt werden. So ist bekannt, daß man über eine hohe Warmband-Haspeltemperatur sowie einen hohen Kaltwalzgrad die Rekristallisationstemperatur absenken kann.Steel strip production can be influenced. It is known that the recrystallization temperature can be reduced by means of a high hot strip coiling temperature and a high degree of cold rolling.
Der Erfindung liegt nun die Aufgabe zugrunde, den Fertigungsaufwand und die damit verbundenen Herstellungskosten für die Erzeugung eines vollständig rekristallisierten kaltgewalzten Bandes oder Blechs zu vermindern .The invention is based on the object of reducing the manufacturing outlay and the associated manufacturing costs for producing a completely recrystallized cold-rolled strip or sheet.
Zur Lösung dieser Aufgabe wird gemäß der Erfindung bei dem gattungsgemäßen Verfahren vorgeschlagen, die Brammen oder Bänder mit einer Anfangstemperatur oberhalb 1100 °C und einer unter Ar3 liegenden Endtemperatur warmzuzwalzen, das Warmband bei einer unter 650 °C liegenden Temperatur zu haspeln und dem anschließenden Kaltwalzen das Kaltband bei einer vom Kaltwalzgrad nahezu unabhängigen je nach Stahlzusammensetzung und Glühe jeweils möglichst niedrigen Temperatur im Bereich von 500 bis 750 °C für eine ausreichend lange Dauer zur vollständigen Rekristallisation zu glühen.To achieve this object, it is proposed according to the invention in the generic method to hot-roll the slabs or strips with an initial temperature above 1100 ° C. and a final temperature below Ar 3 , reeling the hot strip at a temperature below 650 ° C and then cold rolling the cold strip at a temperature as low as possible, depending on the steel composition and annealing, which is almost independent of the degree of cold rolling, in the range from 500 to 750 ° C for a sufficiently long period for complete recrystallization glow.
Der Erfindung liegt die überraschende Feststellung zugrunde, daß über eine abgesenkte Warmwalz-Endtemperatur und eine niedrige Haspeltemperatur vollständige Rekristallisation des kaltgewalzten Bandes oder Bleches bei einer vom Kaltwalzgrad nahezu unabhängigen verhältnismäßig niedrigen Temperatur erfolgen kann. Eine niedrige Temperatur für die Rekristallisationsglühung spart Energie und Kosten.The invention is based on the surprising finding that complete recrystallization of the cold-rolled strip or sheet can take place at a relatively low temperature which is almost independent of the degree of cold rolling, by means of a lowered hot-rolling final temperature and a low coiling temperature. A low temperature for recrystallization annealing saves energy and costs.
Die Stähle können neben den vorstehend angegebenen Legierungsgehalten bis 0,01 % an Stickstoff und die zur Stickstoffabbindung benötigte Menge an Bor (> 0,78 x N) enthalten. Darüber hinaus sind geringe Mengen anderer Legierungselemente, welche dieIn addition to the alloy contents specified above, the steels can contain up to 0.01% nitrogen and the amount of boron (> 0.78 x N) required for nitrogen removal. In addition, small amounts of other alloying elements, which are the
Rekristallisationsbedingungen nicht nachteilig beeinflussen, ebenfalls zulässig.Do not adversely affect recrystallization conditions, also permissible.
Die Warmwalz-Endtemperatur sollte möglichst etwa 50 °C unterhalb von Ar3 liegen und die Haspeltemperatur bevorzugt im Bereich von 300 bis 600 °C. IF-Stähle mit niedrigem Kohlenstoffgehalt bis 0,01 % bzw. mit Ti, V, Nb mikrolegierte Stähle können im Temperaturbereich von 600 bis 780 °C vollständig rekristallisierend geglüht werden, während nicht mikrolegierte Stähle bei noch niedrigerer Temperatur im Bereich von 500 bis 680 °C, weitestgehend unabhängig vom Kaltwalzgrad, vollständig rekristallisierend geglüht werden können.The hot rolling end temperature should preferably be about 50 ° C below Ar 3 and the coiling temperature preferably in the range of 300 to 600 ° C. IF steels with a low carbon content of up to 0.01% or steels microalloyed with Ti, V, Nb can be completely recrystallized annealed in the temperature range from 600 to 780 ° C, while non-microalloyed steels can be annealed at even lower temperatures in the range from 500 to 680 ° C, largely regardless of the degree of cold rolling, can be annealed completely recrystallizing.
Anhand von fünf Beispielen wird die Erfindung naher erläutert .The invention is explained in more detail using five examples.
In Tabelle 1 sind die chemischen Zusammensetzungen von vier Tiefziehstahlen A bis D angegeben. In den Figuren 1 bis 5 sind jeweils die Warmwalz- und Gluhbedingungen enthalten.Table 1 shows the chemical compositions of four deep-drawing steels A to D. Figures 1 to 5 each contain the hot rolling and annealing conditions.
Aus den Kurvenverlaufen ist ersichtlich, wie durch die erfindungsgemaße Kombination von niedriger Warmwalz- Endtemperatur und niedriger Haspeltemperatur, kaltgewalztes Band oder Blech, Beispiele A4 bis C4, die Rekristallisationstemperatur sowohl in der Durchlaufglühe (Fig. 1 und 2) als auch in der Haubengluhe (Fig. 3 bis 5) besonders bei niedrigem Kaltwalzgrad von 30 bis 50 % stark abgesenkt werden kann, gegenüber gleich zusammengesetztem Material, bei dessen Verarbeitung aber eine höhere Warmwalz-Endtemperatur und Haspeltemperatur angewendet wurde. From the curves, it can be seen how the combination of low hot rolling end temperature and low coiling temperature, cold-rolled strip or sheet, examples A4 to C4, the recrystallization temperature both in the continuous annealing (Fig. 1 and 2) and in the bell anneal (Fig 3 to 5) can be greatly reduced, especially with a low degree of cold rolling of 30 to 50%, compared to material of the same composition, but a higher hot rolling end temperature and coiling temperature was used in the processing thereof.
Chemische Zusammensetzung in Gew. %Chemical composition in% by weight
Tabelle 1 Table 1

Claims

Patentansprüche claims
1. Verfahren zur Erzeugung von kaltgewalzten Bändern oder Blechen aus niedriglegiertem Stahl mit jeweils max. 0,2 % C, AI, Ti, V, Nb und jeweils max. 1 % Si und Mn, sowie die zur N-Abbindung benötigte Menge an Bor (> 0,78 x N) Rest Eisen und unvermeidbaren Verunreinigungen, der nach dem Erschmelzen zu Brammen, Dünnbrammen oder Band abgegossen wird, die mit einer Anfangstemperatur oberhalb 1100 °C und einer unter Ar3 liegenden Endtemperatur warmgewalzt werden und das Warmband dann bei einer unter 650 °C liegenden Temperatur gehaspelt und kaltgewalzt wird, worauf das Kaltband bei einer vom Kaltwalzgrad unabhängigen je nach Stahlzusammensetzung jeweils möglichst niedrigen Temperatur im Bereich von 520 bis 780 °C für eine ausreichend lange Dauer zur vollständigen Rekristallisation geglüht wird.1. Process for producing cold-rolled strips or sheets from low-alloy steel, each with max. 0.2% C, AI, Ti, V, Nb and each max. 1% Si and Mn, as well as the amount of boron (> 0.78 x N) rest of iron and unavoidable impurities required for the N-setting. After melting, this is poured into slabs, thin slabs or strips, which have an initial temperature above 1100 ° C and a final temperature below Ar 3 are hot rolled and the hot strip is then coiled and cold rolled at a temperature below 650 ° C, whereupon the cold strip is at a temperature as low as possible in the range from 520 to 780 ° C, depending on the steel composition, depending on the steel composition is annealed for a sufficiently long period for complete recrystallization.
2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , d a ß das Band während des Kaltwalzens einer oder mehreren Zwischenglühungen zwischen den Kaltwalzschritten unterworfen wird.2. The method according to claim 1, wherein the strip is subjected to one or more intermediate anneals between the cold rolling steps during the cold rolling.
3. Verfahren nach Anspruch 1 oder 2, angewendet auf Stähle mit < 0.01 % C und mikrolegierungsfrei sowie für Stähle mit beliebigem C-Gehalt und Mikrolegierungselementen, bei dem das rekristallisierende Glühen in einer Durchlaufglühe im Temperaturbereich von 700 bis 780 °C vorgenommen wird.3. The method according to claim 1 or 2, applied to steels with <0.01% C and free of microalloys and for steels with any C content and microalloying elements, in which the recrystallizing annealing is carried out in a continuous annealing in the temperature range of 700 to 780 ° C.
Verfahren nach Anspruch 1 oder 2, angewendet auf Stähle mit mehr als 0,1 % C und mikrolegierungsfrei, bei dem das rekristallisierende Glühen in einer Durchlaufglühe im Temperaturbereich von 600 bis 680 °C vorgenommen wird.Method according to claim 1 or 2, applied to steels with more than 0.1% C and free of microalloys, in which the recrystallizing annealing is carried out in a continuous annealing in the temperature range from 600 to 680 ° C.
Verfahren nach Anspruch 1 oder 2, angewendet auf Stähle mit < 0.01 % C und mikrolegierungsfrei sowie für Stähle mit beliebigem C-Gehalt und Mikrolegierungselementen, bei dem das rekristallisierende Glühen in einer Haubengluhe im Temperaturbereich von 600 bis 680 °C vorgenommen wird.A method according to claim 1 or 2, applied to steels with <0.01% C and free of microalloys and for steels with any C content and microalloying elements, in which the recrystallizing annealing is carried out in a bell anneal in the temperature range from 600 to 680 ° C.
Verfahren nach Anspruch 1 oder 2, angewendet auf Stähle mit mehr als 0,1 % C und mikrolegierungsfrei, bei dem das rekristallisierende Glühen in einer Haubengluhe im Temperaturbereich von 520 bis 600 °C vorgenommen wird. Method according to claim 1 or 2, applied to steels with more than 0.1% C and free of microalloys, in which the recrystallizing annealing is carried out in a bell anneal in the temperature range from 520 to 600 ° C.
EP99968685A 1998-09-08 1999-09-06 Method for producing cold-rolled bands or sheets Expired - Lifetime EP1109942B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19840788A DE19840788C2 (en) 1998-09-08 1998-09-08 Process for producing cold-rolled strips or sheets
DE19840788 1998-09-08
PCT/EP1999/006533 WO2000014288A1 (en) 1998-09-08 1999-09-06 Method for producing cold-rolled bands or sheets

Publications (2)

Publication Number Publication Date
EP1109942A1 true EP1109942A1 (en) 2001-06-27
EP1109942B1 EP1109942B1 (en) 2003-06-25

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ID=7880087

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Application Number Title Priority Date Filing Date
EP99968685A Expired - Lifetime EP1109942B1 (en) 1998-09-08 1999-09-06 Method for producing cold-rolled bands or sheets

Country Status (19)

Country Link
US (1) US6582537B1 (en)
EP (1) EP1109942B1 (en)
JP (1) JP2002524657A (en)
KR (1) KR100613472B1 (en)
CN (1) CN1103824C (en)
AT (1) ATE243769T1 (en)
AU (1) AU749783B2 (en)
BR (1) BR9913530A (en)
CA (1) CA2342934A1 (en)
CZ (1) CZ300683B6 (en)
DE (2) DE19840788C2 (en)
ES (1) ES2201830T3 (en)
HU (1) HUP0104020A3 (en)
PL (1) PL191884B1 (en)
RU (1) RU2222610C2 (en)
SK (1) SK286577B6 (en)
TR (1) TR200100654T2 (en)
WO (1) WO2000014288A1 (en)
ZA (1) ZA200101676B (en)

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DE10153234A1 (en) * 2001-10-31 2003-05-22 Thyssenkrupp Stahl Ag Hot-rolled steel strip intended for the production of non-grain-oriented electrical sheet and method for its production
US8333923B2 (en) * 2007-02-28 2012-12-18 Caterpillar Inc. High strength gray cast iron
WO2010090352A1 (en) * 2009-02-09 2010-08-12 新日本製鐵株式会社 Titanium material for hot rolling and manufacturing method thereof
RU2699480C1 (en) * 2018-12-14 2019-09-05 Публичное акционерное общество "Северсталь" (ПАО "Северсталь") Method of producing cold-rolled products

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Publication number Publication date
CA2342934A1 (en) 2000-03-16
HUP0104020A2 (en) 2002-02-28
SK2852001A3 (en) 2002-06-04
BR9913530A (en) 2001-06-05
AU5973599A (en) 2000-03-27
KR20010074992A (en) 2001-08-09
TR200100654T2 (en) 2001-07-23
DE19840788C2 (en) 2000-10-05
CZ300683B6 (en) 2009-07-15
CZ2001735A3 (en) 2002-03-13
RU2222610C2 (en) 2004-01-27
ES2201830T3 (en) 2004-03-16
ATE243769T1 (en) 2003-07-15
CN1103824C (en) 2003-03-26
DE19840788A1 (en) 2000-03-16
DE59906117D1 (en) 2003-07-31
ZA200101676B (en) 2002-06-28
EP1109942B1 (en) 2003-06-25
CN1317055A (en) 2001-10-10
WO2000014288A1 (en) 2000-03-16
HUP0104020A3 (en) 2002-03-28
PL346523A1 (en) 2002-02-11
PL191884B1 (en) 2006-07-31
JP2002524657A (en) 2002-08-06
AU749783B2 (en) 2002-07-04
KR100613472B1 (en) 2006-08-18
SK286577B6 (en) 2009-01-07
US6582537B1 (en) 2003-06-24

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