Title:
STEEL WIRE HAVING EXCELLENT FATIGUE CHARACTERISTICS AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2017/169481
Kind Code:
A1
Abstract:
A steel wire containing, in terms of mass%, 0.4-0.8% C, 0.01-3% Si, 0.3-2% Mn, more than 0% to no more than 0.05% P, more than 0% to no more than 0.05% S, and 0.05-2% Cr, the remainder comprising iron and unavoidable impurities, the steel wire having excellent fatigue characteristics characterized in that, when a cross section perpendicular to the long-axis direction of the steel wire is observed, at least 40 grain boundary oxides satisfying conditions (1) and (2) are present per 20 µm of length perpendicular to the long-axis direction. (1): The angle formed by the surface of the steel wire and a line tangent to a grain boundary oxide at a point of intersection of the grain boundary oxide and the surface of the steel wire is 60-120°. (2): The length of the grain boundary oxide in the depth direction from the point of intersection is 0.05-1 µm.
Inventors:
TAKAYAMA SHO
MASUDA TOMOKAZU
MASUDA TOMOKAZU
Application Number:
PCT/JP2017/007980
Publication Date:
October 05, 2017
Filing Date:
February 28, 2017
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C38/00; C21D1/74; C21D9/52; C22C38/60
Foreign References:
| JP2004315968A | 2004-11-11 | |||
| JP2004300481A | 2004-10-28 | |||
| JPH10251760A | 1998-09-22 | |||
| JP2007138260A | 2007-06-07 |
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
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