Global Patent Index - EP 3088102 B1

EP 3088102 B1 20171108 - METHOD FOR CONTINUOUSLY CASTING DIFFERENT GRADES OF STEEL

Title (en)

METHOD FOR CONTINUOUSLY CASTING DIFFERENT GRADES OF STEEL

Title (de)

VERFAHREN ZUM STRANGGIESSEN VON VERSCHIEDENEN STAHLQUALITÄTEN

Title (fr)

PROCÉDÉ POUR LA COULÉE CONTINUE DE DIFFÉRENTES QUALITÉS D'ACIER

Publication

EP 3088102 B1 20171108 (EN)

Application

EP 13900119 A 20131224

Priority

  • KR 20130161155 A 20131223
  • KR 2013012130 W 20131224

Abstract (en)

[origin: EP3088102A1] Provided is a method of continuous casting heterogeneous steels which includes the processes of obtaining dimensionless relative concentrations of subsequent steel to previous steel respectively at surface and inside of a continuous cast strand in real time, calculating positions in a longitudinal direction of the strand having the dimensionless relative concentrations at the surface and the inside obtained in real time, predicting a mixed portion in the strand by respectively comparing the obtained dimensionless relative concentrations of the surface and the inside with reference concentrations, and cutting off the predicted mixed portion. Thus, according to exemplary embodiments, the mixed portion is not cut to a predetermined length regardless of operating conditions during each operation of heterogeneous steels as in the related art, but the dimensionless concentrations of each of the surface and the center of the strand are obtained for each operation of heterogeneous steels, and positions of the strand having the obtained dimensionless concentrations are calculated to predict the position and the length of the mixed portion. Thus, since the accuracy of the prediction of the position and length of the mixed portion is improved, a decrease in profitability due to excessive cut-off of the mixed portion may be prevented and the shipment of defect products due to less cut-off of the mixed portion to client companies may be prevented.

IPC 8 full level

B22D 11/16 (2006.01); B22D 11/00 (2006.01); B22D 19/16 (2006.01)

CPC (source: EP KR)

B22D 11/00 (2013.01 - EP KR); B22D 11/16 (2013.01 - EP KR); B22D 19/16 (2013.01 - EP)

Citation (opposition)

Opponent : Primetals Technologies Austria GmbH

  • JP H0894309 A 19960412 - NITTETSU HOKKAIDO CONTROL SYS, et al
  • JP 2000176611 A 20000627 - NIPPON STEEL CORP
  • JP 2002153949 A 20020528 - KAWASAKI STEEL CO
  • KR 20010057307 A 20010704 - PO HANG IRON & STEEL [KR], et al
  • KR 20120032924 A 20120406 - HYUNDAI STEEL CO [KR]
  • KR 950007169 B1 19950703 - PO HANG IRON & STEEL [KR]
  • US 2013197885 A1 20130801 - AHN JAE HWAN [KR], et al
  • JP H01258857 A 19891016 - NIPPON STEEL CORP
  • JP 2009072800 A 20090409 - JFE STEEL KK
  • KR 20120087532 A 20120807 - HYUNDAI STEEL CO [KR]
  • JP H0890173 A 19960409 - NIPPON STEEL CORP
  • JP H0433756 A 19920205 - SUMITOMO METAL IND
  • ES 2445466 A2 20140303 - GERDAU INVESTIGACION Y DESARROLLO EUROPA S A [ES]
  • MYUNG JONG CHO ET AL.: "A Practical Model for Predicting Intermixed Zone During Grade Transition", ISIJ INTERNATIONAL, vol. 50, no. 8, 2010, pages 1175 - 1179, XP055516820
  • BRIAN G. THOMAS ET AL.: "Modeling Study of Intermixing in Tundish and Strand During a Continuous-Casting Grade Transition", IRON AND STEELMAKER (ISS TRANSACTIONS, vol. 24, no. 12, 1997, Warrendale, PA (E2), pages 83 - 96, XP055516822
  • XIAOQING HUANG ET AL.: "Intermixing Model of Continuous Casting during a Grade Transition", METALLURGICAL TRANSACTIONS B, vol. 27, no. 4, August 1996 (1996-08-01), pages 617 - 632, XP055516826
  • "The AISE Steel Foundation", 2003, Pittsburg, PA (E4), article "The Making, Shaping and Treating of Steel (MSTS) , Casting Volume (2003)"
  • MEHDI ALIZADEH ET AL.: "Behavior of Mixed Grade during the Grade Transition for Different Conditions in the Slab Continuous Casting", ISIJ INTERNATIONAL, vol. 48, no. 1, 2008, pages 28 - 37, XP055516864
  • BRIAN G. THOMAS: "Continuous Casting of Steel", MODELING FOR CASTING AND SOLIDIFICATION PROCESSINGX, 2001, (E7), pages 499 - 540, XP055516872
  • JIUNN-LIN YEH ET AL.: "The Development of a Mathematical Model to Predict Composition Distribution in Casting Slab and Intermix Slab Length during Ladle Changeover Period ant Its Verification by Physical Model", ISIJ INTERNATIONAL, vol. 33, no. 5, 1993, pages 588 - 594, XP055517124
  • X. HUANG ET AL.: "Modeling of Steel Grade Transition in Continuous Slab Casting Processes", 50TH ELECTRIC FURNACE CONFERENCE PROCEEDINGS, 1992, Atlanta, GA (E9), pages 485 - 499, XP055517140
  • MARCELA B. GOLDSCHMIT ET AL.: "Numerical Model for the Minimization of Intermixed Round Bars in a Four Line Continuous Caster", METALLURGICAL AND MATERIALS TRANSACTIONS B, vol. 32, no. 3, pages 537 - 546, XP019697288
  • PETER JUZA ET AL.: "The next level of quality in continuous casting automation, Automation, maintenance, on-line machine control, Session 11", METEC INSTEELCON 2011, vol. 32, no. 3, 27 June 2011 (2011-06-27), Düsseldorf (E11), XP019697288
  • P. NIKOLOPOULOS ET AL.: "Werkstoffeigenschaften unter Störfallbedingungen: Dichten von Kernschmelzen, Grenzflächenenergien zwischen festem Uranoxid und Metallschmelzen", KERNFORSCHUNGSZENTRUM KARLSRUHE, February 1982 (1982-02-01), pages 1 - 26, XP055517177
  • "On the Shrinkage of Metals and its Effect in Solidification Processing, Anders Lagerstedt", CASTING OF METALS, 12 October 2004 (2004-10-12), SE -100 44 Stockholm (E18), pages 1 - 56, XP055517220

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)

EP 3088102 A1 20161102; EP 3088102 A4 20161102; EP 3088102 B1 20171108; EP 3088102 B2 20210113; EP 3088102 B9 20180214; CN 105848808 A 20160810; CN 105848808 B 20180720; JP 2017500206 A 20170105; JP 6220457 B2 20171025; KR 101485913 B1 20150126; WO 2015099213 A1 20150702

DOCDB simple family (application)

EP 13900119 A 20131224; CN 201380081844 A 20131224; JP 2016541665 A 20131224; KR 2013012130 W 20131224; KR 20130161155 A 20131223