| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-strength steel sheet which is inexpensively manufactured without adding a large amount of alloying elements and has a superior balance between strength and toughness. SOLUTION: The high-strength steel sheet superior in balance between strength and toughness is made of a steel comprising, by mass%, 0.02% or more but less than 0.07% C, 0.01-0.5% Si, 0.5-2% Mn, 0.005-0.07% Nb, 0.08% or less Al, 0.005-0.04% Ti, and/or 0.005-0.1 V, and the balance substantially Fe, and is a steel sheet manufactured by rolling, cooling and then reheating the steel to precipitate carbides containing one or more elements selected from among Nb, Ti and V, wherein the carbides newly precipitated by the reheating contains 10 to 300 ppm carbon in total. COPYRIGHT: (C)2005,JPO&NCIPI
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