Title:
AUTOMOBILE UNDERCARRIAGE COMPONENT
Document Type and Number:
WIPO Patent Application WO/2020/196869
Kind Code:
A1
Abstract:
An automobile undercarriage component according to the present invention is provided with a welded joint in which a first steel sheet and a second steel sheet each having tensile strength of 780 MPa or more are overlaid on each other and a fillet weld part is formed between an edge surface of the first steel sheet and a surface of the second steel sheet, wherein the chemical components for a weld metal that forms the welded joint include, in % by mass relative to the whole mass of the weld metal, 0.02 to 0.30% of C, 0.10% or more and less than 1.0% of Si, 1.2 to 3.0% of Mn, 0.002 to 0.30% of Al, 0.005 to 0.30% of Ti, more than 0% and 0.015% or less of P and more than 0% and 0.030% or less of S and satisfy the requirements represented by formulae (1A), (1B), (2) and (3), and a slag in a weld toe of the fillet weld part satisfies the requirement represented by formula (4). Formula (1A): [Al]+[Ti] > 0.05 Formula (1B): [Ti]/[Al] > 0.9 Formula (2): 7×[Si]+7×[Mn]-112×[Ti]-30×[Al] ≦ 12 Formula (3): 2.0 < [Si]+[Mn] Formula (4): [Content of Ti in surface of slag] > [content of Si in surface of slag]
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Inventors:
OTSUKA KENICHIRO (JP)
AZUMA MASAFUMI (JP)
MORI YOICHIRO (JP)
KODAMA SHINJI (JP)
MATSUBA MASAHIRO (JP)
AZUMA MASAFUMI (JP)
MORI YOICHIRO (JP)
KODAMA SHINJI (JP)
MATSUBA MASAHIRO (JP)
Application Number:
PCT/JP2020/014175
Publication Date:
October 01, 2020
Filing Date:
March 27, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; B23K9/00; B23K9/02; B23K9/23; B23K35/30; B60G7/00; C22C38/14; C22C38/58
Domestic Patent References:
| WO2014126246A1 | 2014-08-21 | |||
| WO2019124305A1 | 2019-06-27 |
Foreign References:
| JPH08103884A | 1996-04-23 | |||
| JP2018126755A | 2018-08-16 | |||
| JPH0833982A | 1996-02-06 | |||
| JP2016055659A | 2016-04-21 | |||
| JP2019061002A | 2019-04-18 | |||
| JPH0833997A | 1996-02-06 |
Other References:
See also references of EP 3950995A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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