圆钢 kg/mP=0.00617×直径²50.1545.50.18760.2226.50.2670.30280.39590.499100.617110.746120.888131.04141.21151.39161.58171.78182192.23202.47212.72222.98233.26243.55253.85264.17274.49284.83295.19305.55315.92326.31336.71347.13357.55367.99378.44388.9399.58409.874110.14210.874311.44411.914512.54814.215015.425216.675417.985518.655619.335820.746022.196223.746526.056828.517030.217231.977534.77837.518039.58844.559049.949555.6410061.71056811074.611581.5412088.812596.33130104.2135112.5140121150139160158170178.18180200190223200247230326.18250385.37280483.41300554.85320631.4350755.33400886.59