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Title:
HIGH-DUCTILITY HIGH-CARBON STEEL WIRE
Document Type and Number:
WIPO Patent Application WO/2007/139234
Kind Code:
A1
Abstract:
A high-ductility high-carbon steel wire which is less apt to break during drawing and is used for steel cords, etc. It is a high-carbon steel wire produced by hot rolling and having a carbon content of 0.7% or higher. It comprises 95% or more pearlite structure, and the pearlite in a central part of the hot-rolled wire has a maximum pearlite block grain diameter of 65 µm or smaller. The high-ductility high-carbon steel wire may have a tensile strength in the range of {248+980×(C mass%)}±40 MPa and have a reduction of area of {72.8-40×(C mass%)} % or more. The high-ductility high-carbon steel wire may be characterizedin that the average grain diameter of those pearlite blocks in the central part of the hot-rolled wire which are defined by ferrite grain boundaries having a difference in orientation of 9 degrees of more, as measured with an EBSP apparatus, is 10-30 µm.

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Inventors:
NISHIDA SEIKI (JP)
YAMASAKI SHINGO (JP)
DEMACHI HITOSHI (JP)
MUROGA NARIYASU (JP)
OHASHI SHOUICHI (JP)
NAKAMURA KENICHI (JP)
KOSAKA MAKOTO (JP)
KOMIYA NOBUYUKI (JP)
SAHARA SUSUMU (JP)
Application Number:
PCT/JP2007/061497
Publication Date:
December 06, 2007
Filing Date:
May 31, 2007
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
NISHIDA SEIKI (JP)
YAMASAKI SHINGO (JP)
DEMACHI HITOSHI (JP)
MUROGA NARIYASU (JP)
OHASHI SHOUICHI (JP)
NAKAMURA KENICHI (JP)
KOSAKA MAKOTO (JP)
KOMIYA NOBUYUKI (JP)
SAHARA SUSUMU (JP)
International Classes:
B21B3/00; C22C38/00; C22C38/04; C22C38/54
Foreign References:
JP2001181790A2001-07-03
JP2004137597A2004-05-13
JP2004091912A2004-03-25
JP2003082434A2003-03-19
JPS61261436A1986-11-19
JPH0360900B21991-09-18
JP2000006810A2000-01-11
JP3681712B22005-08-10
Other References:
TAKAHASHI ET AL., THE JOURNAL OF THE JAPAN INSTITUTE OF METALS, vol. 42, 1978, pages 702
"Quantitative Microscopy", 1968, MCGRAW HILL PUBLISHERS
See also references of EP 2025769A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (Toranomon 37 Mori Bldg.5-1, Toranomon 3-chom, Minato-ku Tokyo 23, JP)
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