Title:
NON-HEAT-TREATED WIRE ROD FOR BOLT, NON-HEAT-TREATED STEEL WIRE FOR BOLT, AND METHOD FOR MANUFACTURING SAME, AND NON-HEAT-TREATED BOLT
Document Type and Number:
WIPO Patent Application WO/2017/170756
Kind Code:
A1
Abstract:
A non-heat-treated bolt characterized in that the component composition thereof is, in terms of mass%, 0.05-0.30% C, 1.10-2.5% Si, 0.50-2.5% Mn, more than 0% and no more than 0.03% P, more than 0% and no more than 0.03% S, 0.03-0.30% Cr, 0.010-0.10% Al, and 0.0020-0.0100% N, the remainder comprising iron and unavoidable impurities, a prescribed carbon equivalent Ceq of the non-heat-treated bolt is 0.60 to 0.80, the area ratio of ferrite with respect to the entire structure thereof is 60% or greater and the area ratio of perlite with respect to the entire structure thereof is 5% or greater, and the ferrite crystal grain size number thereof is at least #10.
Inventors:
HIROOKA TOYOHISA
CHIBA MASAMICHI
MOURI KEIKI (JP)
SHIMODA MASAHIKO (JP)
CHIBA MASAMICHI
MOURI KEIKI (JP)
SHIMODA MASAHIKO (JP)
Application Number:
PCT/JP2017/013035
Publication Date:
October 05, 2017
Filing Date:
March 29, 2017
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
SAGA TEKKOSHO CO LTD (JP)
SAGA TEKKOSHO CO LTD (JP)
International Classes:
C22C38/38; C21D8/06; F16B35/00
Domestic Patent References:
| WO2013031640A1 | 2013-03-07 | |||
| WO2013051513A1 | 2013-04-11 |
Foreign References:
| JP2002294401A | 2002-10-09 | |||
| JPH09291312A | 1997-11-11 | |||
| JPH0967622A | 1997-03-11 | |||
| JPH01165721A | 1989-06-29 | |||
| JP2013501147A | 2013-01-10 |
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
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