Steel material

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United States of America Patent

PATENT NO 9994942
SERIAL NO

14400301

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A steel material contains: by mass %, C: greater than 0.05% to 0.18%; Mn: 1% to 3%; Si: greater than 0.5% to 1.8%; Al: 0.01% to 0.5%; N: 0.001% to 0.015%; one or both of V and Ti: 0.01% to 0.3% in total; Cr: 0% to 0.25%; Mo: 0% to 0.35%; a balance: Fe and impurities; and 80% or more of bainite by area %, and 5% or more in total of one or two or more selected from a group consisting of ferrite, martensite and austenite by area %, in which an average block size of the above-described bainite is less than 2.0 μm, an average grain diameter of all of the above-described ferrite, martensite and austenite is less than 1.0 μm, an average nanohardness of the above-described bainite is 4.0 GPa to 5.0 GPa, and MX-type carbides each having a circle-equivalent diameter of 10 nm or more exist with an average grain spacing of 300 nm or less therebetween.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATION6-1 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 100-8071

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kawano, Kaori Tokyo, JP 26 189
Nakazawa, Yoshiaki Tokyo, JP 86 248
Tanaka, Yasuaki Tokyo, JP 39 1501
Tasaka, Masahito Tokyo, JP 13 74
Tomida, Toshiro Tokyo, JP 17 36

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