Cr-Ni alloy and seamless steel pipe made of Cr-Ni alloy

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United States of America

PATENT NO 11286545
APP PUB NO 20200370151A1
SERIAL NO

16962299

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Abstract

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A Cr—Ni alloy having high yield strength and high resistance to sulfuric acid general corrosion at a high temperature of 250° C. is provided. The Cr—Ni alloy has a chemical composition consisting of, in mass %, Si: 0.01 to 0.50%, Mn: 0.01 to 1.00%, Cr: 21.0 to 27.0%, Ni: 40.0 to less than 50.0%, Mo: 4.5 to less than 9.0%, W: 2.0 to 6.0%, Cu: more than 2.0% and not more than 6.0%, Co: 0.01 to 2.00%, one or two kinds selected from the group consisting of Ca and Mg: 0.001 to 0.010% in total, sol. Al: 0.005 to 0.200%, N: 0.01 to 0.20%, and the balance being Fe and impurities. The dislocation density in the Cr—Ni alloy satisfies the following Formula (1):

description='In-line Formulae' end='lead'8.00×1014≤ρ≤2.50×1015+1.40×1014×[Cu+Co]  (1)description='In-line Formulae' end='tail'

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATIONTOKYO JAPAN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Tomio, Akiko Tokyo, JP 3 4
Tomio, Yusaku Tokyo, JP 27 29
Ueyama, Masaki Tokyo, JP 30 174

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