Annealed steel material and method for manufacturing the same

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United States of America

PATENT NO 10988823
APP PUB NO 20180282832A1
SERIAL NO

15936088

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Abstract

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The present invention provides an annealed steel material having a composition containing, in mass %, 0.28≤C≤0.42, 0.01≤Si≤1.50, 0.20≤Mn≤1.20, 4.80≤Cr≤6.00, 0.80≤Mo≤3.20, 0.40≤V≤1.20, and 0.002≤N≤0.080, with the balance being Fe and unavoidable impurities; in which the annealed steel material has a cross-sectional size of a thickness of 200 mm or more and a width of 250 mm or more, and a hardness of 100 HRB or less; and in which a diameter of a largest ferritic grain observed in a microstructure is 120 μm or less in terms of a perfect circle equivalent, an area ratio of carbides is 3.0% or more and less than 10.5%, and an average particle diameter of the carbides is 0.18 μm or more and 0.29 μm or less.

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Patent Owner(s)

Patent OwnerAddress
DAIDO STEEL CO LTDNAGOYA-SHI AICHI 461-8581

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kawano, Masamichi Nagoya, JP 26 75

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