Global Patent Index - EP 2881196 A4

EP 2881196 A4 20150819 - METHOD FOR CONTINUOUSLY CASTING STEEL

Title (en)

METHOD FOR CONTINUOUSLY CASTING STEEL

Title (de)

VERFAHREN ZUM STRANGGIESSEN VON STAHL

Title (fr)

PROCÉDÉ DE COULÉE CONTINUE D'ACIER

Publication

EP 2881196 A4 20150819 (EN)

Application

EP 13825044 A 20130723

Priority

  • JP 2012169182 A 20120731
  • JP 2013099056 A 20130509
  • JP 2013004476 W 20130723

Abstract (en)

[origin: EP2881196A1] A slab is continuously cast in such a manner that the slab is intentionally bulged and thereafter the slab having an unsolidified layer is compressed under conditions controlled to prevent the bulging from causing a breakout of the slab and from causing internal cracks in a solidified shell of the slab to reduce central segregation in the slab and positive segregation near a core portion of the slab. A slab 10 is guided on slab-supporting rolls 6 disposed with constant roll gaps from immediately below a casting mold to a point where the thickness of a solidified shell 11 of the slab reaches 15 mm. Thereafter, the slab is bulged on rolls disposed with gradually increased roll gaps with a total amount of bulging of 3 to 20 mm, and is thereafter guided on rolls disposed with constant roll gaps in a zone 0.5 to 5.0 m in length toward the downstream in the casting direction. Subsequently, when the solid phase fraction in a core portion of the slab is from 0.2 to 0.9, the slab is compressed by at least one pass through reduction rolls 7 under such conditions that the product of the compressing rate multiplied by the casting speed is 0.3 to 1.0 mm·m/min 2 .

IPC 8 full level

B22D 11/128 (2006.01); B22D 11/041 (2006.01); B22D 11/12 (2006.01); B22D 11/16 (2006.01); B22D 11/20 (2006.01)

CPC (source: CN EP KR)

B22D 11/041 (2013.01 - CN EP KR); B22D 11/1206 (2013.01 - CN EP KR); B22D 11/1281 (2013.01 - CN); B22D 11/1282 (2013.01 - CN EP KR); B22D 11/208 (2013.01 - CN EP KR)

Citation (search report)

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

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 2881196 A1 20150610; EP 2881196 A4 20150819; EP 2881196 B1 20160914; BR 112015001929 A2 20160802; BR 112015001929 A8 20180403; BR 112015001929 B1 20190813; CN 104507598 A 20150408; CN 104507598 B 20170308; IN 10142DEN2014 A 20150821; JP 5522324 B1 20140618; JP WO2014020860 A1 20160721; KR 101639349 B1 20160713; KR 20150023796 A 20150305; WO 2014020860 A1 20140206

DOCDB simple family (application)

EP 13825044 A 20130723; BR 112015001929 A 20130723; CN 201380040849 A 20130723; IN 10142DEN2014 A 20141128; JP 2013004476 W 20130723; JP 2013553547 A 20130723; KR 20157001287 A 20130723