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Title:
HIGH STRENGTH STEEL
Document Type and Number:
WIPO Patent Application WO/2018/088214
Kind Code:
A1
Abstract:
The steel of an embodiment of the present invention is steel comprising C: 0.01 mass% to 0.15 mass%, Si: 0.5 mass% or less (including 0 mass%), Mn: 0.6 mass% to 2.0 mass%, P: greater than 0 mass% to 0.03 mass%, S: greater than 0 mass% to 0.025 mass%, Al: 0.01 mass% to 0.07 mass%, Cu: greater than 0 mass% to 1.0 mass%, Ni: greater than 0 mass% to 1.8 mass%, Ti: 0.003 mass% to 0.03 mass%, N: 0.001 mass% to 0.01 mass%, Nb: 0.003 mass% to less than 0.05 mass%, and Cr: 1.2 mass% or less (including 0 mass%), the balance being iron and unavoidable impurities, and is characterized in that when welded, a heat-affected zone comprising MA and surrounding structure around the MA is formed and the heat-affected zone satisfies expression (1). (1) MHhr=MA hardness/surrounding structure hardness≤1.72

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Inventors:
KANEKO MASAHITO
Application Number:
PCT/JP2017/038493
Publication Date:
May 17, 2018
Filing Date:
October 25, 2017
Export Citation:
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Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C38/00; C21C7/00; C21D8/02; C22C38/58
Foreign References:
JP2013155422A2013-08-15
JP2004162150A2004-06-10
JP2009161811A2009-07-23
JP2011025270A2011-02-10
JP2005509740A2005-04-14
JP2011117057A2011-06-16
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
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