Title:
STEEL MATERIAL AND SHOCK-ABSORBENT MEMBER
Document Type and Number:
WIPO Patent Application WO/2014/087511
Kind Code:
A1
Abstract:
Provided is a steel material serving as a material for a shock-absorbent member having high impact energy absorption and reduced fracture under impact load, having the chemical composition, expressed in percentage by mass, of C: 0.05-0.18%, Mn: 1-3%, Si+Al: at least 0.5% but less than 2.5%, and N: 0.001-0.015%, and in some cases, Cr: ≤0.5%, Mo: ≤0.2%, Ti: ≤0.05%, Nb ≤0.05%, V ≤0.2%, and B: ≤0.002%, with the remainder being Fe and impurities, the material having a steel texture in which the area ratio of bainite constituted of lath morphology having average spacing of 1 μm or smaller is 70% or above and the area ratio of martensite is 5-30%, and which satisfies the following formulas (1) and (2): (1) 1.2 ≤ HM0/HB0 ≤ 1.6, (2) 0.90 ≤ {(HM10/HM0)/(HB10/HB0) ≤ 1.3, wherein HM0 and HM10 represent average nano-hardness, in an initial state and after 10% tensile deformation, of the martensite, and HB0 and HB0 represent that of the bainite, respectively.
Inventors:
KAWANO KAORI (JP)
TASAKA MASAHITO (JP)
NAKAZAWA YOSHIAKI (JP)
TANAKA YASUAKI (JP)
TOMIDA TOSHIRO (JP)
TASAKA MASAHITO (JP)
NAKAZAWA YOSHIAKI (JP)
TANAKA YASUAKI (JP)
TOMIDA TOSHIRO (JP)
Application Number:
PCT/JP2012/081601
Publication Date:
June 12, 2014
Filing Date:
December 06, 2012
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; B60R19/34; B62D29/00; C22C38/38; F16F7/00
Domestic Patent References:
| WO2005010396A1 | 2005-02-03 | |||
| WO2005010397A1 | 2005-02-03 | |||
| WO2005010398A1 | 2005-02-03 |
Foreign References:
| JP2012001773A | 2012-01-05 | |||
| JP2011140686A | 2011-07-21 | |||
| JP2008189978A | 2008-08-21 | |||
| JP2012255176A | 2012-12-27 | |||
| JPH1180879A | 1999-03-26 | |||
| JP2006161077A | 2006-06-22 | |||
| JP2004084074A | 2004-03-18 | |||
| JP2004277858A | 2004-10-07 | |||
| JP2000017385A | 2000-01-18 | |||
| JPH11269606A | 1999-10-05 |
Other References:
JOURNAL OF JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY, vol. 46, no. 534, pages 641 - 645
Attorney, Agent or Firm:
HIROSE SHOICHI (JP)
Hirose Shoichi (JP)
Hirose Shoichi (JP)
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