YP460 MPa class heavy thick plate with excellent crack arrestability for mega container carriers has been developed. Advanced alloy design and optimized controlled rolling and cooling process using Super-OLAC (On-Line Accelerated Cooling) are applied to obtain highly oriented textures parallel to the surface of the plate, which are effective to prevent brittle crack propagation. Crack arrest toughness (Kca at -10 °C) of the developed steel is 16800 N/mm3/2, which is more than double of the guidelines on brittle crack arrest design issued by Class NK. The large scale duplex ESSO test, assuming the structure of hatch side coaming of container carriers, was also carried out, and the result revealed that the developed steel plate has excellent performance to stop brittle crack propagation. The developed steel plate is supposed to be utilized to ensure the safety of mega container carriers against the brittle fracture.
Development of YP460 N/mm2 class heavy thick plate with excellent brittle crack arrestability for mega container carriers
Entwicklung schwerer Grobbleche mit einer Mindeststreckgrenze von 460 MPa mit ausgezeichnetem Sprödrissauffangvermögen für große Containerschiffe
Titel japanisch
JFE Giho ; 33 ; 13-18
2014
6 Seiten, 8 Bilder, 7 Tabellen, 19 Quellen
Article (Journal)
Japanese
Schiffsblech , Schiffsbaustahl , Grobblech , hochfester niedrig legierter Stahl , Werkstoffentwicklung , thermomechanische Behandlung , Kerbschlagzähigkeit , Rissstillstand , Rissschließungseffekt , Containerschiff , Schiffsbau , Sprödbruchverhalten , Rissausbreitung , Schweißbarkeit , mikrolegierter Stahl
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