Seamless steel pipe having desirable sulfuric acid dew-point corrosion resistance, and method for manufacturing same

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United States of America

PATENT NO 12227815
APP PUB NO 20220411890A1
SERIAL NO

17623919

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Abstract

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A seamless steel pipe of the present invention is a seamless steel pipe having a composition that includes, in mass %, C: 0.02 to 0.12%, Si: 0.010 to 1.00%, Mn: 0.10 to 2.00%, P: 0.050% or less, S: 0.004% or less, Al: 0.010 to 0.100%, Cu: 0.03 to 0.80%, Ni: 0.02 to 0.50%, Cr: 0.55 to 1.00%, Sb: 0.005 to 0.20%, and the balance Fe and incidental impurities, and satisfying the following formula (1),

description='In-line Formulae' end='lead'1.7×Cu*+11×Cr*+3.8×Sb*≥13.5  (1),description='In-line Formulae' end='tail'

    where Cu*, Cr*, and Sb* represent average concentrations of Cu, Cr, and Sb, respectively, in mass %, as measured in a region 0.5 to 2.0 mm away from an outer surface of the steel pipe,the seamless steel pipe having a yield strength of 230 MPa or more, and a tensile strength of 380 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
Okatsu, Mitsuhiro Tokyo, JP 31 114
Takai, Hiroyuki Tokyo, JP 7 58
Takemura, Yasumasa Tokyo, JP 2 0
Yuga, Masao Tokyo, JP 56 140

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