Thin-gauge bridge weathering steel of steckel mill and production method of thin-gauge bridge weathering steel

The invention relates to the field of metallurgy, discloses steekle mill thin-gauge bridge weathering steel and a production method thereof, and provides the following scheme aiming at the problems of poor impact toughness and high production cost in the prior art: the steekle mill thin-gauge bridge weathering steel comprises the following chemical components in percentage by mass: less than or equal to 0.11% of C, more than or equal to 0.15% and less than or equal to 0.50% of Si, more than or equal to 1.10% and less than or equal to 1.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.005% of S, more than or equal to 0.015% and less than or equal to 0.050% of Als, more than or equal to 0.40% and less than or equal to 0.70% of Cr, more than or equal to 0.30% and less than or equal to 0.40 0.25% < = Cu < = 0.55%, 0.006% < = Ti < = 0.020%, N < = 0.0070%, 0.0010% < = Ca < = 0.0020%, and the balance Fe and inevitable impurities. Production of the bridge weathering resistant steel with the thick