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1. (WO2017170756) NON-HEAT-TREATED WIRE ROD FOR BOLT, NON-HEAT-TREATED STEEL WIRE FOR BOLT, AND METHOD FOR MANUFACTURING SAME, AND NON-HEAT-TREATED BOLT

Pub. No.:    WO/2017/170756    International Application No.:    PCT/JP2017/013035
Publication Date: Fri Oct 06 01:59:59 CEST 2017 International Filing Date: Thu Mar 30 01:59:59 CEST 2017
IPC: C22C 38/38
C21D 8/06
F16B 35/00
Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
株式会社神戸製鋼所
SAGA TEKKOSHO CO., LTD.
株式会社佐賀鉄工所
Inventors: HIROOKA, Toyohisa
廣岡 豊久
CHIBA, Masamichi
千葉 政道
MOURI, Keiki
毛利 啓己
SHIMODA, Masahiko
下田 政彦
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
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.