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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 (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
TASAKA Masahito (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
NAKAZAWA Yoshiaki (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
TANAKA Yasuaki (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
TOMIDA Toshiro (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2012/081601
Publication Date:
June 12, 2014
Filing Date:
December 06, 2012
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
International Classes:
C22C38/00; B60R19/34; B62D29/00; C22C38/38; F16F7/00
Domestic Patent References:
WO2005010396A12005-02-03
WO2005010397A12005-02-03
WO2005010398A12005-02-03
Foreign References:
JP2012001773A2012-01-05
JP2011140686A2011-07-21
JP2008189978A2008-08-21
JP2012255176A2012-12-27
JPH1180879A1999-03-26
JP2006161077A2006-06-22
JP2004084074A2004-03-18
JP2004277858A2004-10-07
JP2000017385A2000-01-18
JPH11269606A1999-10-05
Other References:
See also references of EP 2930253A4
JOURNAL OF JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY, vol. 46, no. 534, pages 641 - 645
Attorney, Agent or Firm:
HIROSE Shoichi (Tozan Building, 4-2 Nihonbashi Honcho 4-chome, Chuo-k, Tokyo 23, 〒1030023, JP)
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