THICK STEEL PLATE HAVING EXCELLENT CRYOGENIC TOUGHNESS

WIPO Patent Application WO/2017/104599

A1

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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MIYAWAKI CHIYOMI
KOBAYASHI YOSHITAKE

PCT/JP2016/086863

June 22, 2017

December 12, 2016

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KOBE STEEL LTD (JP)

C22C38/00; C22C38/44; C22C38/50; C21D8/02

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

See also references of EP 3392361A4

SAMEJIMA, Mutsumi et al. (JP)

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