EP2942416B1 - Feuille d'acier à haute résistance avec une excellente aptitude au façonnage et son procédé de fabrication - Google Patents

Feuille d'acier à haute résistance avec une excellente aptitude au façonnage et son procédé de fabrication Download PDF

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EP2942416B1
EP2942416B1 EP15172192.5A EP15172192A EP2942416B1 EP 2942416 B1 EP2942416 B1 EP 2942416B1 EP 15172192 A EP15172192 A EP 15172192A EP 2942416 B1 EP2942416 B1 EP 2942416B1
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Prior art keywords
temperature
steel sheet
content
temperature range
bainite
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EP2942416A1 (fr
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Yuichi Futamura
Michiharu Nakaya
Takayuki Kimura
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Kobe Steel Ltd
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Kobe Steel Ltd
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Priority claimed from JP2011197671A external-priority patent/JP5685167B2/ja
Priority claimed from JP2011197670A external-priority patent/JP5685166B2/ja
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Claims (6)

  1. Feuillard en acier à haute résistance ayant une excellente aptitude à l'usinage, comprenant :
    C dans une teneur comprise entre 0,10 % et 0,3 % ;
    Si dans une teneur comprise entre 1,0 % et 3 % ;
    Mn dans une teneur comprise entre 1,0 % et 2,5 % ;
    Al dans une teneur comprise entre 0,005 % et 3 % ;
    P dans une teneur contrôlée inférieure ou égale à 0,1 % ; et
    S dans une teneur contrôlée inférieure ou égale à 0,05 %,
    éventuellement comprenant en outre :
    Cr dans une teneur supérieure à 0 % jusqu'à 1 % ; et/ou
    Mo dans une teneur supérieure à 0 % jusqu'à 1 %,
    éventuellement comprenant en outre :
    au moins un élément sélectionné parmi le groupe composé de :
    Ti dans une teneur supérieure à 0 % jusqu'à 0,15 % ;
    Nb dans une teneur supérieure à 0 % jusqu'à 0,15 % ; et
    V dans une teneur supérieure à 0 % jusqu'à 0,15 %,
    éventuellement comprenant en outre :
    Cu dans une teneur supérieure à 0 % jusqu'à 1 % ; et/ou
    Ni dans une teneur supérieure à 0 % jusqu'à 1 %,
    éventuellement comprenant en outre :
    B dans une teneur supérieure à 0 % jusqu'à 0,005 %, et
    éventuellement comprenant en outre :
    au moins un élément sélectionné parmi le groupe composé de :
    Ca dans une teneur supérieure à 0 % jusqu'à 0,01 % ;
    Mg dans une teneur supérieure à 0 % jusqu'à 0,01 % ; et
    un élément de terres rares dans une teneur supérieure à 0 % jusqu'à 0,01 %,
    en pourcentage de masse, le reste étant composé de fer et d'inévitables impuretés,
    où:
    le feuillard en acier possède une structure de métal comprenant de la ferrite polygonale, de la bainite, de la martensite trempée et de l'austénite retenue ;
    (1) lorsque l'on observe la structure de métal avec un microscope à balayage électronique,
    (1a) la ferrite polygonale est présente dans un pourcentage de surface « a » supérieur à 50 % de toute la structure de métal,
    (1b) la bainite possède une microstructure composite comprenant :
    une bainite formée à haute température ayant une distance moyenne entre des zones adjacentes d'austénite retenue et/ou de carbure supérieure ou égale à 1 µm ; et
    une bainite formée à basse température ayant une distance moyenne entre des zones adjacentes d'austénite retenue et/ou de carbure inférieure à 1 µm,
    la bainite formée à haute température est présente dans un pourcentage de surface « b" » de 5 % à 40 % de toute la structure de métal ; et
    la bainite formée à basse température et la martensite trempée sont présentes dans un pourcentage de surface total « c » de 5 % à 40 % de toute la structure de métal ; et
    (2) l'austénite retenue est présente dans un pourcentage en volume supérieur ou égal à 5 % de toute la structure de métal comme cela est déterminé par une mesure d'aimantation à saturation.
  2. Feuillard en acier à haute résistance selon la revendication 1, où, lorsque l'on trouve des éléments constitutifs martensite-austénite à la fois sous forme de martensite trempée et d'austénite retenue en observant une coupe transversale de la structure de métal avec un microscopie optique, les éléments constitutifs martensite-austénite ayant chacun un diamètre de cercle équivalent « d » supérieur à 7 µm sont présents dans un pourcentage numérique de 0 % à moins de 15 % d'un nombre total d'éléments constitutifs martensite-austénite au niveau de la coupe transversale observée.
  3. Feuillard en acier à haute résistance selon l'une des revendications 1 et 2, où les grains de la ferrite polygonale ont un diamètre de cercle équivalent D supérieur à 0 µm jusqu'à 10 µm.
  4. Feuillard en acier à haute résistance selon la revendication 1, comprenant une couche galvanisée par immersion à chaud ou bien une couche recuite par galvanisation par immersion à chaud à la surface dudit feuillard.
  5. Feuillard en acier à haute résistance selon la revendication 1, où la ferrite polygonale est présente dans un pourcentage de surface « a » supérieur ou égal à 55 % de toute la structure de métal.
  6. Feuillard en acier à haute résistance selon la revendication 5, où la ferrite polygonale est présente dans un pourcentage de surface « a » supérieur ou égal à 60 % de toute la structure de métal.
EP15172192.5A 2011-03-31 2012-03-21 Feuille d'acier à haute résistance avec une excellente aptitude au façonnage et son procédé de fabrication Not-in-force EP2942416B1 (fr)

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JP2011080954 2011-03-31
JP2011080953 2011-03-31
JP2011197671A JP5685167B2 (ja) 2011-03-31 2011-09-09 加工性に優れた高強度鋼板およびその製造方法
JP2011197670A JP5685166B2 (ja) 2011-03-31 2011-09-09 加工性に優れた高強度鋼板およびその製造方法
EP12765664.3A EP2695961B1 (fr) 2011-03-31 2012-03-21 Tôle d'acier à haute résistance présentant une excellente aptitude au façonnage, et son procédé de fabrication

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EP12765664.3A Division-Into EP2695961B1 (fr) 2011-03-31 2012-03-21 Tôle d'acier à haute résistance présentant une excellente aptitude au façonnage, et son procédé de fabrication

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EP12765664.3A Active EP2695961B1 (fr) 2011-03-31 2012-03-21 Tôle d'acier à haute résistance présentant une excellente aptitude au façonnage, et son procédé de fabrication

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US (2) US20140044988A1 (fr)
EP (2) EP2942416B1 (fr)
KR (2) KR101574400B1 (fr)
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WO (1) WO2012133057A1 (fr)

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WO2012133057A1 (fr) 2012-10-04
CN103459638A (zh) 2013-12-18
US20160355920A1 (en) 2016-12-08
CN104762565B (zh) 2017-04-12
CN103459638B (zh) 2015-07-15
EP2942416A1 (fr) 2015-11-11
KR20130125829A (ko) 2013-11-19
KR20150050592A (ko) 2015-05-08
CN104762565A (zh) 2015-07-08
EP2695961B1 (fr) 2019-06-19
US20140044988A1 (en) 2014-02-13
EP2695961A4 (fr) 2014-12-17
EP2695961A1 (fr) 2014-02-12
KR101604963B1 (ko) 2016-03-18
KR101574400B1 (ko) 2015-12-03

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