EP1185387B1 - Procede de coulee continue entre cylindres de bandes d'acier inoxydable austentique d'excellente qualite de surface, et bandes ansi obtenues - Google Patents

Procede de coulee continue entre cylindres de bandes d'acier inoxydable austentique d'excellente qualite de surface, et bandes ansi obtenues Download PDF

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Publication number
EP1185387B1
EP1185387B1 EP00915237A EP00915237A EP1185387B1 EP 1185387 B1 EP1185387 B1 EP 1185387B1 EP 00915237 A EP00915237 A EP 00915237A EP 00915237 A EP00915237 A EP 00915237A EP 1185387 B1 EP1185387 B1 EP 1185387B1
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EP
European Patent Office
Prior art keywords
steel
gas
cylinders
austenitic stainless
strips
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00915237A
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German (de)
English (en)
French (fr)
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EP1185387A1 (fr
Inventor
Christian Marchionni
Frédéric Mazurier
Jean-Michel Damasse
Frédéric Descaves
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USINOR SA
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USINOR SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/0651—Casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/002—Stainless steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0697—Accessories therefor for casting in a protected atmosphere
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel

Definitions

  • the invention relates to the continuous casting of metals, and more precisely the casting continuous, directly from liquid metal, of stainless steel strips of the type austenitic whose thickness is of the order of a few mm, by the process known as "casting between cylinders ".
  • the process mainly used today is pouring said liquid metal between two internally cooled cylinders, rotating around their horizontal axes in opposite directions, and arranged opposite one another, the minimum distance between their surfaces being substantially equal to the thickness that is desired impart to the cast strip (for example a few mm).
  • the casting space containing liquid steel is defined by the lateral surfaces of the cylinders, on which the solidification of the strip, and by side refractory closing plates applied against the ends of the cylinders.
  • the liquid metal initiates its solidification on contact with external surfaces of the cylinders, on which it forms solidified "skins", of which ensures that they meet at the "neck", that is to say the area where the distance between cylinders is minimum.
  • microcracks are weak cracks dimensions which are nevertheless sufficient to make them unfit for use cold processed products produced therefrom. They form during solidification steel and have a depth of about 40 ⁇ m and an opening of about 20 ⁇ m. Their appearance is linked to the contractions of the metal during the solidification of the skins at contact of the cylinders, along the length of their contact arc. This solidification can be described as comprising two successive stages. The first step occurs during initial contact between the liquid steel and the surface of the cylinder, which causes the formation of a solid steel skin on the surface of the cylinders.
  • the second step concerns the growth of this skin up to the neck, where as we said. it joins the skin formed on the other cylinder to form the fully solidified strip.
  • the contact between the steel and the surface of the cylinder is conditioned by the topography of the surface of the casting cylinders, conjugate the nature of the inerting gas surrounding the pouring space and the chemical composition steel. All these parameters are involved in establishing heat transfers between the steel and the cylinder and govern the conditions of solidification of the skins.
  • solidification and cooling of the skins they undergo contractions. They depend in particular on the extent of the phase transformation ⁇ ⁇ ⁇ , which takes place with a significant variation in the density of the metal, at the microscopic level. She is determined by the composition of the cast metal. These contractions will also change the conditions for solidification and cooling of the skins.
  • the dimples can conventionally be produced by shot blasting or laser machining. In all the preceding documents, it is required that these dimples are separated from each other.
  • Document EP-A-0 679 114 proposes the use of circumferential grooves formed on the surface of the cylinders, which give said surface a roughness Ra of 2.5 to 15 ⁇ m. It is combined with a chemical composition of the steel allowing solidification into primary austenite, characterized by a Cr eq / Ni eq ratio of less than 1.60. However, solidification into primary austenite increases the sensitivity to hot cracking of stainless steels and the risks of longitudinal cracks forming on the strip.
  • Document EP-A-0 796 685 teaches to cast a steel whose Cr eq / Ni eq ratio is greater than 1.55 so as to minimize the phase changes at high temperature, and to carry out this casting using cylinders whose the surface has joined dimples of diameter 100-1500 ⁇ m and depth 20-150 ⁇ m and by inerting the vicinity of the meniscus (the intersection between the surface of the liquid steel and the surface of the cylinders) with a gas soluble in l steel, or a mixture of gases mainly composed of such a soluble gas.
  • the roughness peaks serve as priming sites for solidification, while the roughness hollows constitute contraction joints of the metal during solidification, and allow a better distribution of the stresses.
  • the Cr eq / Ni eq ratio is greater than 1.70, it is not always possible to avoid the presence of a few microcracks.
  • the object of the invention is to propose a method for casting thin strips of austenitic stainless steel, the surface of which would be free from microcracks and other major defects, not requiring particularly restrictive casting conditions for its implementation, and making it possible to cast steels with a Cr eq / Ni eq ratio which is more extensive than in existing processes.
  • the subject of the invention is also strips which can be produced by this process.
  • the invention consists in combining conditions relating to the composition of the cast metal, the surface condition of the cylinders and the composition of the meniscus inerting gas, so as to obtain a strip-free surface. of micro cracks.
  • the main originality of the required composition is that the metal must contain an amount of sulfur greater than the amounts most commonly encountered (without however being so great as to compromise the resistance of the products to corrosion), and that this content must be combined with a precise range of Cr eq / Ni eq ratios.
  • the conditions of the first contact between the liquid steel and the cylinders constitute a very important factor in the band solidification process, and influential notably on the surface quality of the latter. Their good control is therefore very important to guarantee the absence of micro cracks on the casting strip.
  • the inevitable fluctuations in the level of the surface of the liquid metal present between the cylinders complicate this control, in particular in that they are a source of irregularities in the heat exchanges which take place in this zone of first contact.
  • Others such irregularities are due, during the later stages of the solidification of the skins, to metal contractions during solidification, which result in particular from transformations high temperature phase characteristics of austenitic stainless steels. These contractions can cause micro cracks.
  • Figure 1 shows a micrograph performed on a sample of a thin strip 1 of austenitic stainless steel, seen in longitudinal section.
  • This strip 1 has on its surface 2 a microcrack 3, of the type of those which the invention seeks precisely to avoid.
  • the metallographic attack carried out on the sample highlights a clear area 4 located around the microcrack 3 and in its extension: it corresponds to a segregated zone enriched with certain elements such than nickel and manganese.
  • the curve in FIG. 2 translates the results of these investigations, which were carried out on strips of thickness 3 mm cast at a speed of 50 m / min.
  • the surfaces of the casting rolls were roughened by contiguous dimples with an average depth of 80 ⁇ m and an average diameter of 1000 ⁇ m.
  • the composition of the cast steels fell within the limits: C: 0.02-0.06%; Mn: 1.3-1.6%; P: 0.019-0.024%; If: 0.34-0.45%; Cr: 18.0-18.7%; Ni: 8.6-9.8%; S: 0.0005-0.446%.
  • the Cr eq / Ni eq ratios of these steels ranged from 1.79 to 1.85.
  • the inert gas surrounding the meniscus contained 60% by volume of nitrogen and 40% by volume of argon.
  • the sulfur content of the metal On the abscissa is the sulfur content of the metal, on the ordinate a representative index of the magnitude of the fluctuations in the level of the meniscus during casting, which represents the standard deviation over the thickness of the columnar zones observed on the solidification structure. Of the band.
  • the higher the sulfur content of the metal while moreover the contents of the other elements remain similar, the more the fluctuations in the level of the meniscus have a reduced magnitude. From a sulfur content of 0.007%, this influence decreases very appreciably, whereas it is very clear for the lower contents.
  • the lower limit of 0.007% for the sulfur content also corresponds to the minimum necessary to avoid the formation of microcracks.
  • the inventors determined a set of conditions to observe so that austenitic stainless steels are cast in thin strips without the formation of microcracks on the surface of the strips, and they have been mentioned above. They are justified by the following considerations.
  • the sulfur content is less than 0.007%, the fluctuations in the level of the meniscus become too great, and the irregularities in the heat transfers which result therefrom cause the formation of microcracks, in particular when the Cr eq / Ni eq ratio is greater than 1 70.
  • the upper limit of the sulfur content is set at 0.04% because beyond this value, the influence of the sulfur content on the stability of the meniscus no longer increases significantly, and on the other hand, there is an increased risk of degradation of the resistance to corrosion by pitting of the finished product made from these strips.
  • the phosphorus content must be kept below 0.04%, in order to avoid risks of hot cracking of the bands when the Cr eq / Ni eq ratio is close to 1.55, that is to say when solidification takes place partially in primary austenite, and not mainly in primary ferrite.
  • the Cr eq / Ni eq ratio must be at least 1.55, in that below this value, the steel solidifies at least partially into primary austenite, which increases the sensitivity to cracking of the strip and promotes the appearance of longitudinal cracks, which must also be absolutely avoided.
  • a Cr eq / Ni eq ratio greater than 1.90 the contraction linked to the ferrite-austenite transformation becomes too great, and the microcracks are then inevitable.
  • the level of ferrite in the strip becomes too high, which can lead to ruptures after the shaping of the finished products made from the strips thus cast.
  • the other analytical conditions on cast steel are conventional on steels the most common austenitic stainless steels, especially those of type 304 and related. he it is understood that elements other than those explicitly mentioned in the foregoing may be present in steel, as a small quantity of impurities or alloying elements, insofar as they would not significantly modify the solidification conditions and the surface tension of the liquid steel on the surface of the cylinders, which would confirm the absence of micro cracks on the tapes produced.
  • the nature of the inerting gas surrounding the meniscus has a strong influence on the conditions of contact between the steel and the surface of the cylinders, in particular on the way in which the transfer takes place "in negative" the roughness of the cylinders on the surface of the strip, and the risks of microcracks forming.
  • a gas totally or mainly insoluble in steel such as argon or helium
  • the steel in the course of solidification does not penetrate little or little in the depressions of the surface of the cylinder. Heat extraction is therefore practically only carried out at the roughness peaks, which makes it very heterogeneous on the surface of the cylinder. This heterogeneity is favorable to the appearance of numerous microcracks.
  • an inerting gas containing a significant quantity of a gas soluble in steel such as nitrogen, hydrogen, ammonia, CO 2 , a fortiori if it is entirely constituted by such a gas or a mixture of such gases
  • the steel penetrates well into the depressions of the surface of the cylinders, and the extraction of heat on first contact is important. In addition, this decreases the heterogeneity of heat extraction at the level of peaks and depressions. All this goes in the direction of limiting the risks of micro-crack formation.
  • the lower limit of the content of the inerting gas in a gas (or mixture of gas) soluble in steel the lower limit of the content of the inerting gas in a gas (or mixture of gas) soluble in steel.
  • Strips of austenitic stainless steel 3 mm thick were poured between cylinders.
  • the cylinder surfaces included joined dimples with an average diameter of 1000 ⁇ m and an average depth of 100 ⁇ m.
  • the inert gas surrounding the meniscus contained 40% argon and 60% nitrogen.
  • the composition of the steel varied within the following limits: C: 0.02-0.06%; Mn: 1.3-1.6%; P: 0.019-0.024%; If: 0.34-0.45%; Cr: 18.0-18.7%; Ni: 8.6-9.8%; S: 0.0005-0.0446%.
  • the Cr eq / Ni eq ratio of cast steels varied from 1.79 to 1.85.
  • Strips of thickness 3.8 mm in austenitic stainless steel were poured between cylinders, the compositions of which are shown in Table 2.
  • the cylinders had surface roughnesses characterized by the presence of joined dimples with an average diameter of 1000 ⁇ m and an average depth 120 ⁇ m.
  • the composition of the inerting gas present in the vicinity of the meniscus was varied by modulating its respective proportions in argon and nitrogen, and the surface density of observed microcracks was measured on the cast strips. for the different compositions of the inerting gas used.
  • the composition of the inerting gas is a parameter on which we often wish to play to control the intensity of the heat transfers between the cylinders and the metal, for example to vary the bulging of the cylinders which affects the shape of the strip. (see document EP-A-0 736 350).
  • the results obtained with steel C therefore conclude that a sulfur content of 0.005% cannot fall within the scope of the invention.
  • the strips cast with steels B and D do not exhibit microcracks as long as the nitrogen content of the inerting gas is at least 50%.
  • Their sulfur contents are respectively 0.019 and 0.039%, and their Cr eq / Ni eq ratios are respectively 1.82 and 1.64.
  • the invention applies preferably to the case of steels having a Cr eq / Ni eq ratio of between 1.70 and 1.90, since this range corresponds to steels in which less gammagene elements have been added (such as nickel) than for steels with a lower Cr eq / Ni eq ratio, which are therefore more economical to manufacture.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Metal Extraction Processes (AREA)
  • Heat Treatment Of Articles (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Heat Treatment Of Steel (AREA)
EP00915237A 1999-04-22 2000-04-12 Procede de coulee continue entre cylindres de bandes d'acier inoxydable austentique d'excellente qualite de surface, et bandes ansi obtenues Expired - Lifetime EP1185387B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200030035T SI1185387T1 (en) 1999-04-22 2000-04-12 Method for continuously casting between two rolls austenitic stainless steel strips with excellent surface quality and resulting strips

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9905052 1999-04-22
FR9905052A FR2792560B1 (fr) 1999-04-22 1999-04-22 Procede de coulee continue entre cylindres de bandes d'acier inoxydable austenitique d'excellente qualite de surface, et bandes ainsi obtenues
PCT/FR2000/000780 WO2000064612A1 (fr) 1999-04-22 2000-04-12 Procede de coulee continue entre cylindres de bandes d'acier inoxydable austentique d'excellente qualite de surface, et bandes ansi obtenues

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EP1185387A1 EP1185387A1 (fr) 2002-03-13
EP1185387B1 true EP1185387B1 (fr) 2002-12-11

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EP00915237A Expired - Lifetime EP1185387B1 (fr) 1999-04-22 2000-04-12 Procede de coulee continue entre cylindres de bandes d'acier inoxydable austentique d'excellente qualite de surface, et bandes ansi obtenues

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US (1) US6739383B1 (pl)
EP (1) EP1185387B1 (pl)
JP (1) JP4454868B2 (pl)
KR (1) KR100636868B1 (pl)
CN (1) CN1187148C (pl)
AT (1) ATE229391T1 (pl)
AU (1) AU767990B2 (pl)
BR (1) BR0009894A (pl)
CZ (1) CZ296650B6 (pl)
DE (1) DE60000997T2 (pl)
DK (1) DK1185387T3 (pl)
ES (1) ES2188523T3 (pl)
FR (1) FR2792560B1 (pl)
PL (1) PL194231B1 (pl)
PT (1) PT1185387E (pl)
RU (1) RU2239518C2 (pl)
SI (1) SI1185387T1 (pl)
SK (1) SK286180B6 (pl)
TR (1) TR200103014T2 (pl)
TW (1) TW434058B (pl)
WO (1) WO2000064612A1 (pl)
ZA (1) ZA200108666B (pl)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008090192A1 (de) * 2007-01-24 2008-07-31 Thyssenkrupp Nirosta Gmbh Giesswalze für eine zweiwalzengiessvorrichtung und zweiwalzengiessvorrichtung
US8122937B2 (en) 2007-10-12 2012-02-28 Nucor Corporation Method of forming textured casting rolls with diamond engraving

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10349400B3 (de) * 2003-10-21 2005-06-16 Thyssenkrupp Nirosta Gmbh Verfahren zum Herstellen von gegossenem Stahlband
CN100493745C (zh) * 2006-06-23 2009-06-03 宝山钢铁股份有限公司 双辊薄带连铸方法
US7975754B2 (en) * 2007-08-13 2011-07-12 Nucor Corporation Thin cast steel strip with reduced microcracking
KR101239589B1 (ko) * 2010-12-27 2013-03-05 주식회사 포스코 고내식 마르텐사이트 스테인리스강 및 그 제조방법
US20130126121A1 (en) 2011-11-17 2013-05-23 Nucor Corporation Method of continuous casting thin steel strip
KR101360660B1 (ko) * 2011-12-27 2014-02-07 주식회사 포스코 에지 품질이 우수한 오스테나이트계 스테인리스 강판의 제조방법
KR101510506B1 (ko) 2012-12-26 2015-04-08 주식회사 포스코 스컴의 생성을 저감시킨 쌍롤식 박판 주조 방법
CN103255352B (zh) * 2013-04-19 2015-05-20 山西太钢不锈钢股份有限公司 一种超低碳奥氏体不锈钢棒材中提高形成奥氏体的方法
JP6347864B1 (ja) * 2017-03-24 2018-06-27 日新製鋼株式会社 オーステナイト系ステンレス鋼スラブの製造方法
CN107030264B (zh) * 2017-04-27 2019-04-26 酒泉钢铁(集团)有限责任公司 一种超级奥氏体不锈钢双辊薄带铸轧生产工艺
CN109778077B (zh) * 2017-11-10 2021-01-08 大连华锐重工集团股份有限公司 一种核主泵泵壳材料的冶炼方法
KR102315597B1 (ko) 2018-03-02 2021-10-21 닛폰세이테츠 가부시키가이샤 주조편의 제조 방법 및 연속 주조 설비
CN108239724A (zh) * 2018-03-29 2018-07-03 冯满 一种合金钢

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5103895A (en) * 1989-07-20 1992-04-14 Nippon Steel Corporation Method and apparatus of continuously casting a metal sheet
DE69419593T3 (de) * 1993-11-18 2005-06-09 Castrip, Llc (N.D.Ges.D. Staates Delaware) Giessen eines kontinuierlichen stahlbandes auf eine oberfläche mit bestimmter rauhigkeit
FR2746333B1 (fr) * 1996-03-22 1998-04-24 Usinor Sacilor Procede de coulee continue d'une bande d'acier inoxydable austenitique sur une ou entre deux parois mobiles dont les surfaces sont pourvues de fossettes, et installation de coulee pour sa mise en oeuvre

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008090192A1 (de) * 2007-01-24 2008-07-31 Thyssenkrupp Nirosta Gmbh Giesswalze für eine zweiwalzengiessvorrichtung und zweiwalzengiessvorrichtung
US8122937B2 (en) 2007-10-12 2012-02-28 Nucor Corporation Method of forming textured casting rolls with diamond engraving

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Publication number Publication date
ES2188523T3 (es) 2003-07-01
JP2002542039A (ja) 2002-12-10
JP4454868B2 (ja) 2010-04-21
PL351566A1 (en) 2003-05-05
SI1185387T1 (en) 2003-04-30
EP1185387A1 (fr) 2002-03-13
DE60000997T2 (de) 2003-07-17
AU3661800A (en) 2000-11-10
FR2792560B1 (fr) 2001-06-01
ATE229391T1 (de) 2002-12-15
BR0009894A (pt) 2002-01-15
RU2239518C2 (ru) 2004-11-10
CZ20013776A3 (cs) 2002-03-13
FR2792560A1 (fr) 2000-10-27
DE60000997D1 (de) 2003-01-23
ZA200108666B (en) 2004-06-30
CZ296650B6 (cs) 2006-05-17
TW434058B (en) 2001-05-16
DK1185387T3 (da) 2003-03-24
SK14602001A3 (sk) 2002-05-09
SK286180B6 (sk) 2008-04-07
PL194231B1 (pl) 2007-05-31
US6739383B1 (en) 2004-05-25
KR100636868B1 (ko) 2006-10-19
KR20010113824A (ko) 2001-12-28
TR200103014T2 (tr) 2002-03-21
WO2000064612A1 (fr) 2000-11-02
CN1351528A (zh) 2002-05-29
PT1185387E (pt) 2003-04-30
CN1187148C (zh) 2005-02-02
AU767990B2 (en) 2003-11-27

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