一、钢板Q420qC化学成分牌号CSiMnPSNiCrMo≤0.18≤0.551~1.7≤0.03≤0.025≤0.7≤0.8≤0.35Q420qCCuNbVTiAlsNBPcmMax≤0.55≤0.06≤0.08≤0.03≥0.015≤0.012≤0.004≤0.20二、舞钢Q420qC桥梁钢力学性能品种形状交货状态规格详情Q420qC板,带,型钢热轧,正火,其他≤16ReL(M…