Steel for high-strength bolts which has excellent delayed fracture resistance and bolt formability, and bolt

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United States of America Patent

PATENT NO 10060015
APP PUB NO 20160230260A1
SERIAL NO

15022857

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Abstract

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To provide a steel for high-strength bolts, which can exhibit the sufficient delayed fracture resistance under the severe environment, and also has excellent bolt formability. The steel for high-strength bolts of the present invention includes C: 0.10 to 0.30%; and Ni: 0.4 to 0.7%, with the chemical composition being appropriately adjust, and satisfies the following formulas (1) and (2):

description='In-line Formulae' end='lead'0.85≤[C]+[Si]/7+[Mn]/5+[Ni]/20+[Cr]/9+[Mo]/2≤1.3  (1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'[C]−(0.07×[Mo]+0.20×[V])≤0.20  (2).description='In-line Formulae' end='tail'

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Patent Owner(s)

  • KOBE STEEL, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chiba, Masamichi Kobe, JP 18 26
Inada, Atsushi Kobe, JP 13 30
Kato, Reiko Toyota, JP 3 14
Matsumoto, Yosuke Kobe, JP 24 82
Ureshino, Yoshimasa Toyota, JP 2 0

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