BOLT - NISSAN MOTOR

Title:

BOLT

Document Type and Number:

WIPO Patent Application WO/2019/150434

Kind Code:

A1

Abstract:

The bolt according to the present invention is a high-carbon steel and high-strength bolt which has a tempered martensite texture and the composition of which comprises: 0.50-0.65 mass% inclusive of carbon (C); 1.5-2.5 mass% inclusive of silicon (Si); 1.0-2.0 mass% inclusive of chromium (Cr); 0.2-1.0 mass% inclusive of manganese (Mn); 1.5-5.0 mass% inclusive of molybdenum (Mo); not more than 0.03 mass% of phosphorus (P) and sulfur (S) in total as impurities; and the balance iron (Fe). In this bolt, the carbon concentration satisfies requirement (1) and an increase in the martensitic transformation start temperature (Ms point) in the surface side is suppressed, which brings about a low susceptibility to hardening crack and excellent delayed fracture resistance. Requirement (1): 0.75≤X<1 [wherein X represents surface carbon concentration/internal carbon concentration].

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Inventors:

HAMADA TAKAHIRO (JP)
KOBAYASHI DAISUKE (JP)

Application Number:

PCT/JP2018/002983

Publication Date:

August 08, 2019

Filing Date:

January 30, 2018

Export Citation:

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Assignee:

NISSAN MOTOR (JP)

International Classes:

C22C38/00; C21D9/00; C22C38/34; F16B35/00

Domestic Patent References:

WO2016031528A1	2016-03-03
WO2016031528A1	2016-03-03

Foreign References:

JP2012233244A	2012-11-29
JPH10141341A	1998-05-26
JPS6452045A	1989-02-28
JPH11199922A	1999-07-27

Other References: