A high tensile bolt and a manufacturing method for the same

Japanese Patent JP6017944

B2

PROBLEM TO BE SOLVED: To provide a high tensile bolt which has a tensile strength of ≥1,700 MPa, and is excellent in tensile deformation performance and a delayed fracture resistance characteristic, and a method for manufacturing the same.SOLUTION: Steel containing, by mass, C:0.35-0.70%, Si:0.50-2.50%, Mn:0.10-1.00%, Cr:0.30-3.00%, Mo:0.50-1.50%, Al:0.001-0.1%, and the residue comprising Fe and inevitable impurities is used as a material. The steel is formed in a bolt shape having a thread section shape at the thread section in which an angle of a flank face is set to 60°, the height of fundamental triangle of the thread section is set as H, and a transition point between the flank face and the bottom of the thread facing each other is set as H/2 from a bottom side of the fundamental triangle, and in which an arc-shaped curve is formed, the arc-shaped curve drawing a small abutting circle that abuts on the flank face at the transition point and that has a radius of curvature R of ≥H/3.5 and ≤H/2.5. The bolt-shaped steel is hardened by austenitizing treatment in a temperature range of 850-1,050°C, and then is subjected to tempering treatment in a temperature range of 500-650°C.

JPH09508960	INDUSTRIAL APPLICABILITY: A connecting tool having threads on both sides.
JP2008534878	Fasteners for connecting components and assemblies that embody them
JPH07305709	SELF-ALIGNING BOLT

Kimura Yuji
Tsuzaki Kaneaki
Takashi Yamaguchi
Hiroshi Masuda

JP2012269065A

November 02, 2016

December 10, 2012

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National Institute for Materials Science
Osaka City University
Utsunomiya University

F16B35/00; C21D9/00; C22C38/00; C22C38/34; F16B31/06; F16B33/04

JP2007270293A
JP8177831A
JP2002276637A
JP2007031733A
JP2003004016A

US4861210
US20060222475

Janggi Motonori

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