Steel material suitable for use in sour environment

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United States of America Patent

PATENT NO 11891680
APP PUB NO 20220042148A1
SERIAL NO

17414727

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Abstract

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A steel material according to the present disclosure has a chemical composition consisting of, in mass %: C: 0.15 to 0.45%, Si: 0.05 to 1.00%, Mn: 0.01 to 1.00%, P: 0.030% or less, S: 0.0050% or less, Al: 0.005 to 0.100%, Cr 0.55 to 1.10%, Mo: 0.70 to 1.00%, Ti: 0.002 to 0.020%, V: 0.05 to 0.30%, Nb: 0.002 to 0.100%, B: 0.0005 to 0.0040%, N: 0.0100% or less, O: less than 0.0020%, and the balance being Fe and impurities, and satisfying Formula (1) described in the specification. A grain diameter of a prior-austenite grain is 15.0 μm or less, and an average area of precipitate which is precipitated in a prior-austenite grain boundary is 12.5×10−3 μm2 or less. A yield strength is 758 to 862 MPa.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATIONTOKYO

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Arai, Yuji Tokyo, JP 237 4486
Kamitani, Hiroki Tokyo, JP 20 16
Komatsubara, Nobuaki Tokyo, JP 4 1
Oe, Taro Tokyo, JP 7 3
Otome, Yohei Tokyo, JP 9 32
Soma, Atsushi Tokyo, JP 17 26
Takabe, Hideki Tokyo, JP 25 126

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