EP 1633894 B1 20170426 - METHOD AND INSTALLATION FOR THE PRODUCTION OF HOT-ROLLED STRIP HAVING A DUAL-PHASE STRUCTURE
Title (en)
METHOD AND INSTALLATION FOR THE PRODUCTION OF HOT-ROLLED STRIP HAVING A DUAL-PHASE STRUCTURE
Title (de)
VERFAHREN UND ANLAGE ZUR HERSTELLUNG VON WARMBAND MIT DUALPHASENGEFÜGE
Title (fr)
PROCEDE ET INSTALLATION POUR PRODUIRE UN FEUILLARD LAMINE A CHAUD A STRUCTURE BIPHASEE
Publication
Application
Priority
- EP 2004006170 W 20040608
- DE 10327383 A 20030618
Abstract (en)
[origin: WO2004111279A2] The aim of the invention is to be able to produce dual-phase steels under local conditions even in the existing cooling section of a continuous casting and rolling plant by means of controlled cooling of the hot-rolled strip in two cooling stages following the forming process. Said aim is achieved by respecting the chemical composition of the initial steel within precisely defined limits and cooling in two stages from a finished rolled strip temperature Tfinish of A3 -100K < Tfinish < A3 -50K to a coiling strip temperature Tcoiling of < 300 DEG C (< initial martensite temperature), the cooling speed V1,2 in both cooling stages ranging between 30 and 150 K/s, preferably between 50 and 90 K/s. The first cooling stage is carried out until the cooling curve enters the ferrite range, whereupon the heat released by the transformation of the austenite into ferrite is used for isothermally holding the obtained strip temperature Tconst during a holding time of = 5 s until the beginning of the second cooling stage.
IPC 8 full level
B22D 11/00 (2006.01); C21D 8/02 (2006.01); C21D 11/00 (2006.01); C21D 1/02 (2006.01); C21D 1/19 (2006.01)
CPC (source: EP KR US)
B22D 11/001 (2013.01 - EP US); B22D 11/1206 (2013.01 - EP US); C21D 8/02 (2013.01 - KR); C21D 8/0226 (2013.01 - EP US); C21D 11/005 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/18 (2013.01 - EP US); C22C 38/38 (2013.01 - KR); C22C 38/42 (2013.01 - EP US); B21B 1/463 (2013.01 - EP US); C21D 1/02 (2013.01 - EP US); C21D 1/19 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Citation (opposition)
Opponent : Primetals Technologies Austria GmbH
- EP 0750049 A1 19961227 - THYSSEN STAHL AG [DE]
- EP 0072867 A1 19830302 - KAWASAKI STEEL CO [JP]
- GB 2445749 A 20080723 - KOBE STEEL LTD [JP], et al
- WO 0147648 A2 20010705 - SIEMENS AG [DE], et al
- WO 03000940 A1 20030103 - SIEMENS AG [DE], et al
- EP 0280259 A2 19880831 - KAWASAKI STEEL CO [JP]
- JP H02137608 A 19900525 - NIPPON KOKAN KK
- JP H06190419 A 19940712 - KAWASAKI STEEL CO
- JP H04167916 A 19920616 - SUMITOMO METAL IND
- DE 19513999 A1 19961017 - SUNDWIGER EISEN MASCHINEN [DE]
- CHIAKI OUCHI ET AL.: "The Effect of Hot Rolling Condition and Chemical Composition on the Onset Temperature of gamma-alphaTransformation after Hot Rolling", TRANSACTIONS ISIJ, vol. 22, no. 3, 1982, pages 214 - 222, XP055457563
- K.-E. HENSGER: "PROCESSING OF ADVANCED STRUCTURAL STEELS ON CSP PLANTS", METALURGIJA, vol. 41, no. 3, 2002, pages 183 - 190, XP055377004
- T. WATERSCHOOT ET AL.: "Influence of run-out table cooling patterns on transformation and mechanical properties of high strength dual phase and ferrite-bainite steels", IRONMAKING AND STEELMAKING, vol. 28, no. 2, 2001, pages 185 - 190, XP055457577
- ANTHONY J. DEARDO: "Multi-phase Microstructures and Their Properties in High Strength Low Carbon Steels", ISIJ INTERNATIONAL, vol. 35, no. 8, 1995, pages 946 - 954, XP055457583
- HERMAN J. C. ET AL.: "Ultra-fast cooling in the hot-strip mill (Phase I)", EUROPEAN COMMISSION TECHNICAL STEEL RESEARCH, 2002, XP055457607
- A .J. DEARDO ET AL.: "CSP Production of Value-Added Niobium Bearing Steels", BASIC METALS PROCESSING RESEARCH INSTITUTE, DEPARTMENT OF MATERIALS SCIENCES, UNIVERSITY OF PITTSBURGH, 2003, XP055457617
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004111279 A2 20041223; WO 2004111279 A3 20050506; CA 2529837 A1 20041223; CA 2529837 C 20120821; CN 100381588 C 20080416; CN 1820086 A 20060816; DE 10327383 A1 20050210; DE 10327383 B4 20101014; DE 10327383 C5 20131017; EG 23893 A 20071213; EP 1633894 A2 20060315; EP 1633894 B1 20170426; JP 2006527790 A 20061207; JP 5186636 B2 20130417; KR 20060057538 A 20060526; MY 136875 A 20081128; RU 2006101338 A 20060610; RU 2346061 C2 20090210; TW 200502405 A 20050116; TW I300443 B 20080901; UA 81329 C2 20071225; US 2007175548 A1 20070802; ZA 200509876 B 20061129
DOCDB simple family (application)
EP 2004006170 W 20040608; CA 2529837 A 20040608; CN 200480016757 A 20040608; DE 10327383 A 20030618; EG NA2005000837 A 20051217; EP 04739698 A 20040608; JP 2006515855 A 20040608; KR 20057023848 A 20051212; MY PI20042336 A 20040616; RU 2006101338 A 20040608; TW 93117287 A 20040616; UA A200600445 A 20040608; US 56138504 A 20040608; ZA 200509876 A 20051206