Title:
THICK STEEL PLATE HAVING EXCELLENT CRYOGENIC TOUGHNESS
Document Type and Number:
WIPO Patent Application WO/2017/104599
Kind Code:
A1
Abstract:
A thick steel plate having excellent cryogenic toughness and an Ni content of 5.50 to 7.50%, wherein a prescribed component composition is satisfied, the volume fraction v of the residual austenite phase that exists at -196°C is 4.0 to 12%, and if the plate thickness is denoted as t, the fracture facet size configuration parameter M value represented by equation (1) is 2.4 or above. In equation (1), DI is a value calculated according to equation (2), and [ ] represents the content of each element in mass%. (1) M value = (DI × v2) / t (2) DI = 1. 16 × ([C ] / 10) 0.5 × (0. 7 × [Si] + 1) × (1 + 3.33 × [Mn]) × (1 + 0. 35 × [Cu]) × (1 + 0.36 × [Ni]) × (1 + 2.16 × [Cr]) × (1 + 3 × [Mo]) × (1 + 1.75 × [V ] ) × 1
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Inventors:
MIYAWAKI CHIYOMI
KOBAYASHI YOSHITAKE
KOBAYASHI YOSHITAKE
Application Number:
PCT/JP2016/086863
Publication Date:
June 22, 2017
Filing Date:
December 12, 2016
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C38/00; C22C38/44; C22C38/50; C21D8/02
Foreign References:
JP2014210948A | 2014-11-13 | |||
JP2015086403A | 2015-05-07 | |||
JP2013213273A | 2013-10-17 | |||
JP2014118579A | 2014-06-30 | |||
JP2013234381A | 2013-11-21 | |||
JP2014040648A | 2014-03-06 | |||
JP2015199983A | 2015-11-12 | |||
JP2014125678A | 2014-07-07 |
Other References:
See also references of EP 3392361A4
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
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