Title:
耐破壊特性および耐HIC特性に優れる高強度鋼板
Document Type and Number:
Japanese Patent JP5299579
Kind Code:
B2
Abstract:
A high-strength steel sheet having improved HIC resistance and fracture resistance even when it is thick has a chemical composition comprising, in mass %, C: 0.02 - 0.07%, Si: 0.05 - 0.50%, Mn: 1.10 - 1.60%, P: at most 0.015%, S: at most 0.0030%, Nb: 0.005 - 0.030%, Ti: 0.005 - 0.020%, Al: 0.005 - 0.060%, Ca: 0.0005 - 0.0060%, N: 0.0015 - 0.0070%, at least one of Cu, Ni, Cr, and Mo in a total of greater than 0.1 % to less than 1.5%, and a remainder of Fe and impurities and a steel structure composed of at least 10% by area of bainite and a remainder of ferrite and pearlite. The degree of segregation is less than 1.6 for Nb and less than 1.4 for Mn in the central portion of the thickness of the steel sheet.
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Inventors:
Minato
Nobuaki Takahashi
Akio Yamamoto
Nobuaki Takahashi
Akio Yamamoto
Application Number:
JP2012531974A
Publication Date:
September 25, 2013
Filing Date:
September 02, 2011
Export Citation:
Assignee:
Nippon Steel & Sumitomo Metal Corporation
International Classes:
C22C38/00; C21D8/02; C22C38/58
Domestic Patent References:
| JP2002363689A | 2002-12-18 | |||
| JP2009221534A | 2009-10-01 | |||
| JP2010077492A | 2010-04-08 | |||
| JP2009228099A | 2009-10-08 | |||
| JP2000160245A | 2000-06-13 | |||
| JPH07216500A | 1995-08-15 |
Attorney, Agent or Firm:
Shoichi Hirose