High-strength seamless steel pipe for oil country tubular goods and method of producing the same

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United States of America Patent

PATENT NO 10472690
APP PUB NO 20170275715A1
SERIAL NO

15509361

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Provided is a high-strength seamless steel pipe having the composition which contains, by mass %, 0.20 to 0.50% C, 0.05 to 0.40% Si, 0.3 to 0.9% Mn, 0.015% or less P, 0.005% or less S, 0.005 to 0.1% Al, 0.008% or less N, 0.6 to 1.7% Cr, 0.4 to 1.0% Mo, 0.01 to 0.30% V, 0.01 to 0.06% Nb, 0.0003 to 0.0030% B, and 0.0030% or less O (oxygen). The high-strength seamless steel pipe has the microstructure where a volume fraction of a tempered martensitic phase is 95% or more, and prior austenitic grains have a grain size number of 8.5 or more, and a segregation degree index Ps which is defined by a formula Ps=8.1 (XSi+XMn+XMo)+1.2XP relating to XM which is a ratio between a segregated portion content and an average content is set to less than 65.

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Patent Owner(s)

  • JFE STEEL CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujimura, Kazuki Handa, JP 11 34
Ishiguro, Yasuhide Handa, JP 42 266
Okatsu, Mitsuhiro Handa, JP 31 114
Yuga, Masao Handa, JP 56 140

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