EP 2025769 A4 20100818 - HIGH-DUCTILITY HIGH-CARBON STEEL WIRE
Title (en)
HIGH-DUCTILITY HIGH-CARBON STEEL WIRE
Title (de)
STARK DEHNBARER HARTSTAHLDRAHT
Title (fr)
FIL D'ACIER À TENEUR ÉLEVÉE EN CARBONE ET DE GRANDE DUCTILITÉ
Publication
Application
Priority
- JP 2007061497 W 20070531
- JP 2006153303 A 20060601
Abstract (en)
[origin: EP2025769A1] A high-carbon steel wire rod of high ductility for steel cord and the like is provided that experiences little breakage during drawing. The high-carbon steel wire rod of high ductility is a high-carbon steel wire rod fabricated by hot rolling that that has a carbon content of 0.7 mass% or greater, wherein 95% or greater of the wire rod metallographic structure is pearlite structure and the maximum pearlite block size of pearlite at the core of the hot-rolled wire rod is 65 µm or less. The high-carbon steel wire rod of high ductility has a tensile strength in a range of {248 + 980 x (C mass%)} ± 40 MPa} and a reduction of area of {72.8 - 40 x (C mass%) %} or greater. The high-carbon steel wire rod of high ductility is characterized in that the average pearlite block size at the core of the hot-rolled wire rod constituted by ferrite grain boundaries of an orientation difference of 9 degrees or greater as measured with an EBSP analyzer is 10 µm or greater and 30 µm or less.
IPC 8 full level
C22C 38/00 (2006.01); B21B 3/00 (2006.01); C22C 38/04 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP KR US)
B21B 1/16 (2013.01 - KR); C21D 8/065 (2013.01 - EP KR US); C22C 38/001 (2013.01 - KR); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/18 (2013.01 - EP KR US); D07B 1/066 (2013.01 - EP US); B21B 1/16 (2013.01 - EP US)
Citation (search report)
- [E] JP 2007131944 A 20070531 - NIPPON STEEL CORP
- [E] EP 1900837 A1 20080319 - NIPPON STEEL CORP [JP]
- [E] EP 2090671 A1 20090819 - NIPPON STEEL ENGINEERING CORP [JP]
- [L] EP 2062991 A1 20090527 - NIPPON STEEL CORP [JP]
- See references of WO 2007139234A1
Citation (examination)
- US 2003079815 A1 20030501 - HATA HIDEO [JP], et al
- US 5458699 A 19951017 - TSUKAMOTO TAKASHI [JP], et al
Designated contracting state (EPC)
BE DE FR GB IT LU
DOCDB simple family (publication)
EP 2025769 A1 20090218; EP 2025769 A4 20100818; BR PI0702892 A2 20110315; BR PI0702892 B1 20141118; CA 2617381 A1 20071206; CA 2617381 C 20130917; CN 101341270 A 20090107; CN 101341270 B 20120418; JP 5092749 B2 20121205; JP WO2007139234 A1 20091015; KR 101018054 B1 20110302; KR 20080017433 A 20080226; US 2009087336 A1 20090402; US 2011284139 A1 20111124; WO 2007139234 A1 20071206
DOCDB simple family (application)
EP 07744836 A 20070531; BR PI0702892 A 20070531; CA 2617381 A 20070531; CN 200780000792 A 20070531; JP 2007061497 W 20070531; JP 2007541531 A 20070531; KR 20087000099 A 20070531; US 201113134210 A 20110531; US 98967607 A 20070531