| 摘要 |
PROBLEM TO BE SOLVED: To provide a non-heat treated type high tensile strength steel plate having excellent toughness and to provide its manufacturing method. SOLUTION: The non-heat treated steel plate with high toughness and high tensile strength contains, by mass, 0.02 to 0.06% C, 0.05 to 0.5% Si, 1 to 1.6% Mn, 0.02 to 0.07% Al, 0.005 to 0.02% Ti, 0.010 to 0.030% Nb, 0.0010 to 0.0030% B and 0.003 to 0.0050% N, and is formed so that the amount of solid-solution Nb is 0.010 to 0.025% and that of solid-solution B is 0.0010 to 0.0025%. COPYRIGHT: (C)2004,JPO
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