Weathering steel alloy composition and the weight percentage of the content is: C: 0.12 ~ 0.21, Si: 0.2 ~ 2.0, Mn: 0.7 ~ 2.0, S, P acuities were 0.034, 0.036 or less Cu: 0.10 ~ 0.40, Al < 0.2, and the rest for Fe and trace impurities.Through the Cu, Mn, Si, Al, such as alloying, http://www.jingyesteel.com.cn/