Martensitic stainless steel seamless pipe for oil country tubular goods, and method for manufacturing same

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United States of America

PATENT NO 12221663
APP PUB NO 20210198764A1
SERIAL NO

17058781

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Abstract

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The invention is intended to provide a martensitic stainless steel seamless pipe for oil country tubular goods having a yield stress of 758 MPa or more, and excellent sulfide stress corrosion cracking resistance. A method for manufacturing such a martensitic stainless steel seamless pipe is also provided. The martensitic stainless steel seamless pipe for oil country tubular goods has a composition that contains, in mass %, C: 0.010% or more, Si: 0.5% or less, Mn: 0.05 to 0.50%, P: 0.030% or less, S: 0.005% or less, Ni: 4.6 to 8.0%, Cr: 10.0 to 14.0%, Mo: 1.0 to 2.7%, Al: 0.1% or less, V: 0.005 to 0.2%, N: 0.1% or less, Ti: 0.010 to 0.054%, Cu: 0.01 to 1.0%, and Co: 0.01 to 1.0%. C, Mn, Cr, Cu, Ni, Mo, W, N, and Ti satisfy the predetermined relations, and the balance is Fe and incidental impurities. The martensitic stainless steel seamless pipe has a yield stress of 758 MPa or more.

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Patent Owner(s)

  • JFE STEEL CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Endo, Mami Tokyo, JP 25 296
Kamo, Yuichi Tokyo, JP 23 65
Yuga, Masao Tokyo, JP 56 140

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