High-tension steel plate excellent in base metal toughness and HAZ toughness

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United States of America Patent

PATENT NO 9109274
APP PUB NO 20140003990A1
SERIAL NO

13869521

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Abstract

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The steel plate of the invention is a high-tension steel plate that has a tensile strength of 1100 MPa or more and is excellent in base metal toughness and HAZ toughness and preferably in abrasion resistance. The steel plate satisfies a predetermined requirement of components in the steel. The Ceq (IIW) represented by the following equation ranges from 0.40 to 0.45 both inclusive:

description='In-line Formulae' end='lead'Ceq(IIW)=[C]+{⅙×[Mn]}+{⅕×([Cr]+[Mo]+[V])}+{ 1/15+([Cu]+[Ni])}description='In-line Formulae' end='tail'

in which each parenthesis-symbol [ ] means the content by percentage of an element in the parentheses. Oxide grains having a maximum diameter of 2 μm or less are present in a number density of 200/mm2 or more in the steel. The steel is composed of 29% or more by volume of martensite microstructure, and bainite microstructure as the balance.

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Patent Owner(s)

Patent OwnerAddress
KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL LTD )2-4 WAKINOHAMA-KAIGANDORI 2-CHOME CHUO-KU KOBE-SHI HYOGO 651-8585

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kou, Hiroaki Kakogawa, JP 2 4

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