Normalized steel plate for wind power, and production method thereof

The invention discloses a normalized steel plate for wind power, and a production method thereof. The yield strength, the tensile strength, the elongation percentage A, the -40DEG C impact energy and the -60DEG C impact energy of the normalized steel plate for wind power are not lower than 370MPa, 500-650MPa, not lower than 30%, not lower than 250J and not lower than 200J respectively. The steel plate comprises, by mass, 0.12-0.18% of C, 0.21-0.32% of Si, 1.10-1.65% of Mn, 0.015% or less of P, 0.008% or less of S, 0.015-0.040% of Nb, 0.015-0.03% of Ti, 0.025-0.06% of Als, 0.004-0.010% of N, and the balance of Fe and inevitable impurities; and 203*C -44.7*Si is not lower than 61 and not greater than 72, and Ti/(C/100+N) is in a range of 2.47-2.69 or 2.88-2.90. Nb and Ti alloy is used in the steel plate, so alloy cost of the steel plate is reduced, the low temperature performances of the steel plate are enhanced, the yield strength is high, and the technical problems of high alloy cost, poor low temperature performances and small normalized yield strength of steel plates for wind power in the prior art are solved.