Global Patent Index - EP 3204530 B1

EP 3204530 B1 20190109 - COLD ROLLED STEEL SHEET AND RECRYSTALLISATION-ANNEALED STEEL FLAT PRODUCT AND METHOD FOR PRODUCING THE SAME

Title (en)

COLD ROLLED STEEL SHEET AND RECRYSTALLISATION-ANNEALED STEEL FLAT PRODUCT AND METHOD FOR PRODUCING THE SAME

Title (de)

KALTGEWALZTES UND REKRISTALLISIEREND GEGLÜHTES STAHLFLACHPRODUKT UND VERFAHREN ZU DESSEN HERSTELLUNG

Title (fr)

PRODUIT PLAT EN ACIER LAMINÉ À FROID ET RECRISTALLISANT, AINSI QUE SON PROCÉDÉ DE FABRICATION

Publication

EP 3204530 B1 20190109 (DE)

Application

EP 15762569 A 20150909

Priority

  • EP 14188314 A 20141009
  • EP 2015070577 W 20150909

Abstract (en)

[origin: WO2016055227A1] The invention relates to a cold-rolled and recrystallisation annealed flat steel product with a ferritic micro-structure, having an optimised formability and suitability for painting. In addition, the flat steel product is formed by a steel having C: 0.0001-0.003 wt.%, Si: 0.001-0.025 wt.%, Mn: 0.05-0.20 wt.%, P: 0.001-0.015 wt.%, Al: 0.02-0.055 wt.%, Ti: 0.01-0.1 wt.%, as well as respectively optionally Cr: 0.001-0.05 wt.%, V: up to 0.005 wt.%, Mo: up to 0.015 wt.%, N: 0.001-0.004 wt.%. In addition, the flat steel product has the following mechanical characteristics: Rp0.2 ≤ 180 MPa, Rm ≤ 340 MPa, A80 ≤ 40%, n-value ≤ 0.23. Furthermore, on at least one of the surfaces thereof, the flat steel product has an arithmetic roughness average Ra of 0.8-1.6 µm and a peak value RPc of 75/cm. The production of the flat steel product involves, in a continuous process in a N2-H2- annealing atmosphere, the recrystallisation annealing thereof, and an overaging process. Subsequently, the flat steel product undergoes a skin-pass rolling by means of a working roller and with a skin-pass rate D of 0.4-0.7%, the circumferential surface of which working roller has a roughness average Ra of 1.0-2.5 µm and a peak value RPc ≥ 100/cm, wherein the peaks and depressions shaped into the surface of the skin-pass working roller are provided in a stochastically distributed manner.

IPC 8 full level

C23C 2/02 (2006.01); C21D 8/04 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01)

CPC (source: EP KR US)

C21D 8/0436 (2013.01 - EP KR US); C21D 8/0442 (2013.01 - EP KR US); C21D 8/0447 (2013.01 - KR); C21D 8/0473 (2013.01 - EP KR US); C21D 9/46 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/004 (2013.01 - EP US); C22C 38/008 (2013.01 - EP US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/06 (2013.01 - EP KR US); C22C 38/14 (2013.01 - EP US); C22C 38/42 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/46 (2013.01 - EP US); C22C 38/48 (2013.01 - EP US); C22C 38/50 (2013.01 - EP US); C22C 38/54 (2013.01 - EP US); C25D 3/22 (2013.01 - KR); C21D 2211/005 (2013.01 - EP KR US)

Citation (examination)

WO 2014037545 A1 20140313 - DAETWYLER GRAPHICS AG [CH], et al

Citation (opposition)

Opponent : ArcelorMittal

  • JP H08337842 A 19961224 - KOBE STEEL LTD
  • EP 0391658 B1 19930721
  • RU 2366730 C1 20090910 - MAGNITOGORSKIJ METALL KOM AOOT [RU]
  • US 5954896 A 19990921 - KOYAMA KAZUO [JP], et al
  • FRANK BEIER ET AL: "From skin pass to paint - evaluation of measurements of sheet metal waviness and roughness throughout the processing chain", SCT 2014, 15 June 2014 (2014-06-15) - 19 June 2014 (2014-06-19), pages 183 - 190, XP055653077
  • BSI: "Cold rolled low carbon steel flat products for cold forming - Technical delivery conditions", BSI NORME EN 10130:2006, December 2006 (2006-12-01), XP055653082
  • GREGORY GERSTEIN ET AL: "Characterization of the microstructure evolution in IF-Steel and AA6016 during plane-strain tension and simple shear", MATERIALS, vol. 8, no. 1, 15 January 2015 (2015-01-15), pages 285, XP055653086
  • CORNELIUS FRONHOFFS ET AL: "Steel for highest paint appearance quality in automotive application", STEELS IN CARS AND TRUCKS. SCT2014, 15 June 2014 (2014-06-15) - 19 June 2014 (2014-06-19), pages 175 - 182, XP055654002
  • ANONYMOUS: "ThyssenKrupp Steel Europe présents innovative finishes for top class paintwork", THYSSENKRUPP - PRESS RELEASE, 5 November 2013 (2013-11-05), XP055654006, Retrieved from the Internet <URL:https://www.thyssenkrupp-steel.com/en/newsroom/press-releases/press-release-2282.html>
  • BÉRANGER G. ET AL: "Le livre de l'acier", 1994, TECHNIQUE & DOCUMENTATION, article "INT'ERÉT INDUSTRIEL DU RECUIT CONTINU", pages: 1350 - 1352, XP055654012
  • LOUIS P. ET AL: "Continuous annealing line of Sollac Ste Agathe", DEVELOPMENTS IN THE ANNEALING OF SHEET STEELS, 22 October 1991 (1991-10-22) - 24 October 1991 (1991-10-24), pages 43 - 49, XP055654020
  • KOHICHI TAYA ET AL: "Development of the strip temperature control technique for a continuos annealing line", DEVELOPMENTS IN THE ANNEALING OF STEEL SHEETS, 22 October 1991 (1991-10-22) - 24 October 1991 (1991-10-24), pages 133 - 143, XP055654023
  • M. BLUMENAU ET AL: "Modernization of the continuous annealing line of ThyssenKrupp Steel Europe in Dortmund", STEEL, 2012, pages 568 - 576, XP055654027
  • IRIE T. ET AL: "Development of deep drawable and bake hardenable high strength steel sheet by continuous annealing of extra low-carbon steels with Nb or Ti and P", METALLURGY OF CONTINUOUS-ANNEALED STEEL SHEET, 15 February 1982 (1982-02-15), pages 155 - 171, XP055654029
  • COPPIN P. ET AL: "Atmosphères de traitement thermique", TECHNIQUES DE L'INGÉNIEUR, 10 March 2000 (2000-03-10), XP055654034, Retrieved from the Internet <URL:https://www.techniques-ingenieur.fr/base-documentaire/materiaux-th11/traitements-thermiques-des-metaux-generalites-42500210/atmospheres-de-traitement-thermique-m1220/role-de-l-atmosphere-m1220niv10001.html>
  • RITTERBACH B.: "Qualitätregelkreis zur Erzeugung definierter Feinblechrauheiten mit verschiedenen Texturierverfahren", DISSERTATION, 1999, XP055654036

Opponent : Salzgitter Flachstahl GmbH

  • DE 102012017703 A1 20140313 - DAETWYLER GRAPHICS AG [CH], et al
  • DE 69408739 T2 19980716 - NIPPON KOKAN KK [JP]
  • DIN: "Elektrolytisch verzinkte kaltgewalzte Flacherzeugnisse aus Stahl zum Kaltu mformen - Technische Lieferbedingungen; Deutsche Fassung EN 10152:2009", DIN EN 10152, July 2009 (2009-07-01), pages 1 - 21, XP055651994
  • WOLFGANG BLECK: "Werkstoffkunde Stahl für Studium und Praxis", 2004, IEHK, Aachen, pages: 126 - 129, XP055653036
  • "Stahlfibel FACHBUCH", 2007, VERLAG STAHLEISEN, Düsseldorf, article "Kaltumformen von Stahl", pages: 120 - 123, XP055653070
  • ZIMNIK, WALTER: "Pretex - Ein neues Verfahren zur Erzeugung texturierter Feinbleche für höchste Ansprüche", STAHL UND EISEN, vol. 118, no. 3, 1998, pages 75 - 80, XP055651998
  • ANONYMOUS: "Qualitätsprotokoll Dressierstraße 3", SALZGITTER NR. 0047783/001, 24 June 2014 (2014-06-24), XP055652763
  • "Spurenelemente in Stählen", 1985, VERLAG STAHLEISEN, Düsseldorf, article "Spurenelemente im Stahl - Moeglichkeiten zur Beeinflussung im Smelzbetrieb", pages: 19 - 22, XP002433212

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DOCDB simple family (publication)

WO 2016055227 A1 20160414; BR 112017007273 A2 20180123; BR 112017007273 B1 20210309; CA 2961427 A1 20160414; CA 2961427 C 20190108; CN 106795575 A 20170531; CN 106795575 B 20180828; EP 3204530 A1 20170816; EP 3204530 B1 20190109; ES 2716937 T3 20190618; JP 2017534758 A 20171124; JP 6636512 B2 20200129; KR 102462210 B1 20221103; KR 20170067839 A 20170616; MX 2017004593 A 20170710; PL 3204530 T3 20190731; TR 201905219 T4 20190521; US 10683560 B2 20200616; US 2017306430 A1 20171026; ZA 201701938 B 20220525

DOCDB simple family (application)

EP 2015070577 W 20150909; BR 112017007273 A 20150909; CA 2961427 A 20150909; CN 201580054737 A 20150909; EP 15762569 A 20150909; ES 15762569 T 20150909; JP 2017518505 A 20150909; KR 20177012453 A 20150909; MX 2017004593 A 20150909; PL 15762569 T 20150909; TR 201905219 T 20150909; US 201515518167 A 20150909; ZA 201701938 A 20170320