350MPa-grade anti-seismic and weather-resistant steel plate for building structure and preparation method thereof

The invention provides a 350MPa-grade anti-seismic weather-resistant steel plate for a building structure and a preparation method thereof. The 350MPa-grade anti-seismic weather-resistant steel plate comprises the following components in percentage by weight: 0.05 to 0.10 percent of C, 0.35 to 0.45 percent of Si, 0.90 to 1.00 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.008 percent of S, 0.60 to 0.70 percent of Cr, 0.25 to 0.35 percent of Ni, 0.30 to 0.40 percent of Cu, 0.015 to 0.055 percent of Als and the balance of Fe and inevitable impurities. The preparation method comprises the steps that a plate blank containing the components is sequentially subjected to heating, rough rolling, finish rolling, laminar cooling and coiling, and then the anti-seismic and weather-resistant steel plate for the building structure is obtained. According to the invention, the atmospheric corrosion resistance index I is greater than or equal to 6.5, and both the atmospheric corrosion resista