HIGH-STRENGTH THICK STEEL PLATE SUPERIOR IN DROP-WEIGHT PROPERTIES AND TOUGHNESS OF BASE METAL

PROBLEM TO BE SOLVED: To provide a thick steel plate which can secure adequate drop-weight properties and the toughness of a base metal, only by controlling the content of a necessary alloying element. SOLUTION: The high-strength thick steel plate satisfies a predetermined composition of chemical co...

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Bibliographische Detailangaben
1. Verfasser:	KO HIROAKI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a thick steel plate which can secure adequate drop-weight properties and the toughness of a base metal, only by controlling the content of a necessary alloying element. SOLUTION: The high-strength thick steel plate satisfies a predetermined composition of chemical components; has such a value F defined by the following formula (1): value F = 9.4×[Mo]+8.1×[V]+4.7×[Cr] (wherein [Mo], [V] and [Cr] represent the contents (mass%) of Mo, V and Cr, respectively), as to satisfy the relation of 3.20≤(value F)≤4.50; and includes a tempered bainitic structure containing crystal grains which are surrounded by large-angle grain boundaries formed by the two crystals having an orientation difference of 15° or more and have a mean circle equivalent diameter of 4 μm or less. COPYRIGHT: (C)2011,JPO&INPIT