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Title:
THICK STEEL SHEET HAVING EXCELLENT WELDING HEAT-AFFECTED PART TOUGHNESS
Document Type and Number:
WIPO Patent Application WO/2014/045829
Kind Code:
A1
Abstract:
A thick steel sheet according to the present invention has a specified chemical composition and contains oxides, wherein constituent elements for the oxides excluding oxygen fulfil the formulae: 2% < Ti < 40%, 5% < Al < 30%, 5% < Ca < 40%, 5% < REM < 50%, 2% < Zr < 30% and 1.0 ≤ REM/Zr in mass%, and wherein, among the particles of the oxides, the number of particles each having an equivalent circle diameter of less than 2 μm is 300 particles/mm2 or more and the number of particles each having an equivalent circle diameter of 2 μm or more is 100 particles/mm2 or less, and wherein, among particles of a Ti nitride, the number of particles each having an equivalent circle diameter of 1 μm or more is 7 particles/mm2 or less and the number of particles each having an equivalent circle diameter of 20 nm or more is 1.0 × 106 particles/mm2 or more, and wherein the relational formula: |da-df|/da ≤ 0.35 is fulfilled.

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WO/2022/215448HOT-STAMP-MOLDED OBJECT
Inventors:
NAKO HIDENORI
HATANO HITOSHI
OKAZAKI YOSHITOMI
IBANO AKIRA
DEURA TETSUSHI
SHIMAMOTO MASAKI
SUGITANI TAKASHI
KIMURA SEI
SATO SHINSUKE
Application Number:
PCT/JP2013/073223
Publication Date:
March 27, 2014
Filing Date:
August 29, 2013
Export Citation:
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Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C38/00; C22C38/14; C22C38/58; C21C7/04; C21D8/02
Foreign References:
JP2012092422A2012-05-17
JP2012092425A2012-05-17
JP2008121074A2008-05-29
JP2001098340A2001-04-10
JP2004218010A2004-08-05
JP2010095781A2010-04-30
JP2001020031A2001-01-23
JP2007247005A2007-09-27
JP2008223062A2008-09-25
JP2009179844A2009-08-13
JPH07252586A1995-10-03
JP2008223081A2008-09-25
JP2009138255A2009-06-25
JP2010168644A2010-08-05
JP2011219797A2011-11-04
Other References:
See also references of EP 2899289A4
Attorney, Agent or Firm:
HAMADA Yuriko et al. (JP)
Yuriko Hamada (JP)
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