钢筋外径、内径、每米重数据表钢筋直径mm6789101214161820222528323640钢筋外径mm6.87.89.010.011.313.015.517.520.022.024.027.030.034.539.543.5钢筋内径mm5.86.87.58.59.311.013.015.017.019.021.024.026.530.534.538.5单根面积c㎡0.2830.3850.5030.6360.7851.1311.5392.0112.5453.1423.8014.9096.1588.04210.17912.566钢筋每米重㎏0.2220.3020.3950.4990.6170.8881.2101.5802.0002.4702.9803.8504.8306.3107.9909.870Ⅰ级：R235 φ （光面） Ⅱ级：HRB335 φ （罗纹）