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Title:
耐水素脆性に優れた高強度ボルト
Document Type and Number:
Japanese Patent JP7064529
Kind Code:
B2
Abstract:
To propose a high-strength bolt capable of imparting a hydrogen embrittlement resistance characteristic without changing the composition of a conventional steel material.SOLUTION: A high-strength bolt is made of a first metal, and comprises a head part and a shaft part connected to the head part. The shaft part has a screw part. The surface of the shaft part is covered with a second metal having a higher ionization tendency than the first metal in a preset range from the base end to the tip end of the shaft part. The first metal is exposed on the surface of at least a part of the head part.SELECTED DRAWING: Figure 2

Inventors:
Gosuke Forty
General Nakamura
Application Number:
JP2020083489A
Publication Date:
May 10, 2022
Filing Date:
May 11, 2020
Export Citation:
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Assignee:
Mitsuchi Co., Ltd.
International Classes:
F16B33/06; F16B31/06
Domestic Patent References:
JP6069421U
JP5000367B2
JP59113309A
JP8007136Y2
JP57037673B2
JP2020020402A
JP2013076434A
Foreign References:
US20170350435
Attorney, Agent or Firm:
Kaiyu International Patent Office