Steel bar for downhole member, and downhole member

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 10995394
APP PUB NO 20190177823A1
SERIAL NO

16099330

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A steel bar for a downhole member is provided that is excellent in SCC resistance and SSC resistance. A martensitic stainless steel bar material for a downhole member of the present embodiment has a chemical composition that contains, by mass %, C: 0.020% or less, Si: 1.0% or less, Mn: 1.0% or less, P: 0.03% or less, S: 0.01% or less, Cu: 0.10 to 2.50%, Cr: 10 to 14%, Ni: 1.5 to 7.0%, Mo: 0.2 to 3.0%, Ti: 0.05 to 0.3%, V: 0.01 to 0.10%, Nb: 0.1% or less, Al: 0.001 to 0.1% and N: 0.05% or less, with the balance being Fe and impurities, and satisfies Formula (1) and Formula (2).

description='In-line Formulae' end='lead'[Mo]−4×[total Mo amount in precipitate at R/2 position]≥1.30  (1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'[Total Mo amount in precipitate at center position]−[total Mo amount in precipitate at R/2 position]≤0.03  (2)description='In-line Formulae' end='tail'

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Patent Owner(s)

  • 501 NIPPON STEEL CORPORATION

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Amaya, Hisashi Tokyo, JP 29 121
Matsuo, Daisuke Tokyo, JP 48 248
Nakahata, Takuji Tokyo, JP 1 1
Okuyama, Tsutomu Tokyo, JP 9 74
Takabe, Hideki Tokyo, JP 23 114

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