Title:
HEAT-TREATED STEEL WIRE HAVING EXCELLENT FATIGUE-RESISTANCE CHARACTERISTICS
Document Type and Number:
WIPO Patent Application WO/2016/158562
Kind Code:
A1
Abstract:
Provided is a heat-treated steel wire having excellent fatigue-resistance characteristics. This heat-treated steel wire has a prescribed chemical component composition and the remainder comprises iron and unavoidable impurities. A tempered martensite structure at a depth of 0.3 mm from the surface includes: no more than 0.20/µm2 Cr-based carbides having a circle-equivalent diameter of at least 0.1 µm and less than 0.3 µm; no more than 0.002/µm2 Cr-based carbides having a circle-equivalent diameter of at least 0.3 µm and less than 0.7 µm; and no more than 0.0010/µm2 Cr-based carbides having a circle-equivalent diameter of at least 0.7 µm. The residual austenite content is more than 5 vol% and no more than 15 vol%.
Inventors:
OURA HIROSHI
MASUDA TOMOKAZU
MASUDA TOMOKAZU
Application Number:
PCT/JP2016/058959
Publication Date:
October 06, 2016
Filing Date:
March 22, 2016
Export Citation:
Assignee:
KK KOBE SEIKO SHO(KOBE STEEL LTD ) (JP)
International Classes:
C22C38/00; C22C38/34; C22C38/54
Domestic Patent References:
| WO2007114491A1 | 2007-10-11 |
Foreign References:
| JP2013213238A | 2013-10-17 | |||
| JP2006183137A | 2006-07-13 | |||
| JP2002180198A | 2002-06-26 | |||
| JPH05320827A | 1993-12-07 | |||
| JPH046211A | 1992-01-10 |
Other References:
See also references of EP 3279357A4
Attorney, Agent or Firm:
UEKI, Kyuichi et al. (JP)
Hisakazu Ueki (JP)
Hisakazu Ueki (JP)
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