Title:
SPRING STEEL
Document Type and Number:
WIPO Patent Application WO/2017/131077
Kind Code:
A1
Abstract:
This spring steel includes a prescribed chemical component and satisfies the relationship ([Ti mass%] - 3.43 × [N mass%])/[S mass%] > 4.0 and the relationship [Ni mass%] + [Cu mass%] < 0.75, the frequency of appearance of MnS, among inclusions having an equivalent circular diameter of 1 μm or greater as observed at a position 1/4 of the diameter from the surface, being less than 20%.
Inventors:
SUZUKI TAKAHISA (JP)
YOSHIDA SUGURU (JP)
NEISHI YUTAKA (JP)
YOSHIDA SUGURU (JP)
NEISHI YUTAKA (JP)
Application Number:
PCT/JP2017/002687
Publication Date:
August 03, 2017
Filing Date:
January 26, 2017
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/34; C22C38/54
Domestic Patent References:
| WO2008053884A1 | 2008-05-08 | |||
| WO1998051834A1 | 1998-11-19 | |||
| WO2016186033A1 | 2016-11-24 |
Foreign References:
| JP2014162949A | 2014-09-08 | |||
| JP2007126700A | 2007-05-24 | |||
| JP3577411B2 | 2004-10-13 | |||
| JP2001049337A | 2001-02-20 | |||
| JP2839900B2 | 1998-12-16 |
Other References:
See also references of EP 3409810A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
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