ELECTRIC-RESISTANCE-WELDED STEEL PIPE FOR PRODUCING HOLLOW STABILIZER, HOLLOW STABILIZER, AND METHOD FOR PRODUCING SAME

Title:

ELECTRIC-RESISTANCE-WELDED STEEL PIPE FOR PRODUCING HOLLOW STABILIZER, HOLLOW STABILIZER, AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2020/003720

Kind Code:

A1

Abstract:

The present invention makes it possible to provide a high-strength stabilizer having excellent bending workability and fatigue characteristics even when a hollow steel pipe is used as the stabilizer to reduce weight. An electric-resistance-welded steel pipe (5) for producing a hollow stabilizer has a Lankford value (r value) in the pipe longitudinal direction of 0.7 to less than 1.0. The electric-resistance-welded steel pipe (5) is cold-bend formed, then subjected to heat treatment comprising quenching and tempering, and a stabilizer is produced. The cold-bend forming is a cold rotational draw-bending process, in which the bend radius is 1.0 to 3.0 times the outside diameter of the electric-resistance-welded steel pipe (5) prior to cold-bend forming by the process, the flattening ratio when processed is 0% to 10%, the thickness reduction ratio of the outside of the bend and the thickness increase ratio of the inside of the bend are 0% to 10%, and the change in circumference of the center part of the bend is 0% to 10%. The Vickers hardness of the heat-treated stabilizer is adjusted to 400 HV to less than 580 HV.

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Inventors:

ARATANI MASATOSHI (JP)
MATSUI RYOJI (JP)
KONDO TOMONORI (JP)
KOKUBO SHINSAKU (JP)

Application Number:

PCT/JP2019/017399

Publication Date:

January 02, 2020

Filing Date:

April 24, 2019

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/00; B21C37/08; B21D7/025; B60G21/055; C21D8/10; C21D9/08; C21D9/50; C22C38/38; C22C38/58

Domestic Patent References:

WO2017056384A1

2017-04-06

Foreign References:

JP2006206999A	2006-08-10
JP2003201543A	2003-07-18
JP2009191330A	2009-08-27
JP2010274716A	2010-12-09
JP2005076047A	2005-03-24
JP2010121157A	2010-06-03
JP2013203309A	2013-10-07
US20170009321A1	2017-01-12
JP5287164B2	2013-09-11
JP2018121799A	2018-08-09

Other References: