Title:
A steel wire for high intensity springs excellent in waterproof matter brittleness, a manufacturing method for the same, and a high intensity spring
Document Type and Number:
Japanese Patent JP5973903
Kind Code:
B2
Abstract:
A high-strength spring steel wire is provided which secures excellent hydrogen embrittlement resistance even when the adding amount of alloy elements is suppressed, and has 80 area% or more of tempered martensite and 1,900 MPa or more of the tensile strength, in which a predetermined chemical composition is satisfied, with C and Si satisfying the relation of the expression (1) below, with prior austenite grain size number being No. 10 or more, and with the hydrogen absorption amount being 14.0 ppm or more. 0.73 % ‰¤ C + Si / 8 ‰¤ 0.90 % where [C] and [Si] express the content (mass%) of C and Si respectively.
Inventors:
Atsuhiko Takeda
Nao Yoshihara
Nao Yoshihara
Application Number:
JP2012279437A
Publication Date:
August 23, 2016
Filing Date:
December 21, 2012
Export Citation:
Assignee:
KABUSHIKI KAISHA KOBE SEIKO SHO
International Classes:
C22C38/00; C21D8/06; C21D9/60; C22C38/06; C22C38/54
Domestic Patent References:
| JP2002180198A | ||||
| JP2007191776A |
Attorney, Agent or Firm:
Kyuichi Ueki
Hisahiko Ueki
Tadashi Sugakawa
Hiroaki Ito
Hitomi Mizushima
Hisahiko Ueki
Tadashi Sugakawa
Hiroaki Ito
Hitomi Mizushima
Previous Patent: The thick steel plate excellent in cryogenic temperature toughness
Next Patent: MANUFACTURE OF COMPOSITE PANEL
Next Patent: MANUFACTURE OF COMPOSITE PANEL