METHOD FOR DETERMINATION OF BRITTLE CRACK PROPAGATION STOPPING PERFORMANCE IN HIGH-INTENSITY THICK STEEL PLATE

WIPO Patent Application WO/2011/108135

A1

Disclosed is a method for determining the brittle crack propagation stopping performance of a high-intensity thick steel plate, comprising: a step of performing a large test and a compound small test using standard steel; a step of calculating a correlation model between the results of the large test and the results of the compound small test using the standard steel; a step of performing the compound small test using sample steel; and a step of estimating the brittle crack propagation stopping performance of the sample steel by substituting the results of the compound small test using the sample steel into the correlation model, wherein the compound small test includes (a) a step of obtaining a surface layer small test piece which includes a portion of the steel plate surface layer;(b) a step of obtaining an inner small test piece respectively from one or no less than two inner regions which do not include the portion of the steel surface layer; (c) a step of performing a drop weight test using the surface layer small test piece; and (d) a step of performing a small test for measuring the percent brittle fracture or the absorption energy using the inner small test piece; and the compound small test is performed in different fashions for the surface layer small test piece and the inner small test piece respectively.

ISHIKAWA TADASHI (JP)
INOUE TAKEHIRO (JP)
NAKASHIMA KIYOTAKA (JP)
SHIRAHATA HIROYUKI (JP)
OOTANI JUN (JP)
ITOH AKIRA (JP)

PCT/JP2010/065147

September 09, 2011

September 03, 2010

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NIPPON STEEL CORP (JP)
ISHIKAWA TADASHI (JP)
INOUE TAKEHIRO (JP)
NAKASHIMA KIYOTAKA (JP)
SHIRAHATA HIROYUKI (JP)
OOTANI JUN (JP)
ITOH AKIRA (JP)

G01N3/30; C21D8/02; C22C38/00; C22C38/06; C22C38/60

JP2009109486A	2009-05-21
JP2009063320A	2009-03-26
JP2008046106A	2008-02-28
JP2010048417A	2010-03-04
JP2007302993A	2007-11-22

JUN OTANI ET AL.: "Simplified Evaluation Method for Crack Arrestability in Steel Plate having Surface Layers with an Ultra Fine Grained Microstructure (First Report) : Proposal Equation to estimate arrestability from NRL Drop Weight Test data", TRANSACTIONS OF THE WEST-JAPAN SOCIETY OF NAVAL ARCHITECTS, vol. 106, 31 August 2003 (2003-08-31), pages 275 - 280, XP008169009
TSUTOMU FUKUI ET AL.: "Simplified Evaluation Method for Crack Arrestability in Steel Plate having Surface Layers with Ultra Fine Grained Microstructure (Second Report) : Arrestability Evaluation Specification by NRL Drop weight Test", TRANSACTIONS OF THE WEST-JAPAN SOCIETY OF NAVAL ARCHITECTS, vol. 106, 31 August 2003 (2003-08-31), pages 281 - 287, XP008169008
See also references of EP 2508866A4
"Review of Arrestability of Steel Plate (5)), Summary of Lecture", vol. 4, 1991, IRON AND STEEL INSTITUTE OF JAPAN, article "Correlation between Kca and Small-scale Arresting Test and Arrestability Controlling Factor", pages: 918
"Simple Method of Evaluating Arrestability of Ultra-fine-grain Surface Steel Plate (One) - Establishment of Arrestability Estimating Equation", WEST-JAPAN SOCIETY OF NAVAL ARCHITECTS, no. 106, pages 275 - 280
"Influence of Toughness Distribution in Plate-pressing Direction on Arrestability of Extremely-thick HT790", NATIONAL CONVENTION, JAPAN WELDING SOCIETY, SUMMARY OF LECTURE, vol. 49, 25 August 1991 (1991-08-25), pages 108 - 109

SHIGA Masatake et al. (JP)
Masatake Shiga (JP)

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