圆钢直径公差.doc

热轧圆钢和方钢（GB／T702-1986）热轧圆钢和方钢的尺寸规格 直径d(或边长a)／mm精度组别 截面面积／cm²理论质量(kg／m)1组2组3组圆  钢方  钢圆 钢方  钢允许偏差／mm5.5士0.20±0.30士0.40O．23750.300.1860.23760.28270.360.2220.2836.50.33180.420.2600.33270.38480.490.3020.3858±0.25±0.35±0.400.50770.640.3950.50290.63620.810.4990.636100.78541.00.6170.785*1l0.95031.210.7460.95121.1311.440.8881.13131.3271.691.041.33141.5391.961.2l1.54151.7672.251.391.77162.0112.561.582.01172.2702.891.782.27182.5453.242.002.54192.8353.612.232.83203.1424.002.473.1421±O．30±O．40±O．503.4644.412.723.46223.80l4.842.983.80*234.1555.293.264.15244.5245.763.554.52254.9096.253.854.91265.3096.764.175.3l*275.7267.294.495.72286.1587.844.836.15*296.6058.415.186.60307.0699.005.557.06*31±0.40±0.50±0.607.5489.6l5.937.54328.04210.246.318.04*338.55310.896.718.55349.09711.567.139.07*359.62l12.257.559.623610.1812.967.9910.23811.3414.448.9011．34012.5716.009.8612.64213.8517.6410.913.84515.9020.2512.515.94818.1023.0414.218.15019.6425．0015.419.653±0.60士O．70±0.8022.0628.0917.322．O*5523.7630.2518.623.75624.6331.3619.324.6*5826.4233.6420.726.460±O．60±O．70±0.8028.2736.0022.228.36331.1739.6924.531.2*6533.1842.2526．O33.2*6836.3246.2428.536.37038.4849.0030.238.57544.1856.2534.744.28050.2764.0039.550.285±O．9±1.0±1.156.7572.2544.556.79063.6281.0049.963.69570.8890.2555.670.810078.54100.0061.778.510586.59110.2568.086.511095.03121.0074.695．0115±1.2±1.3±1.4103.82132.2681.5104120113.10144.0088.8113125122.72156.2596.3123130132.73169.00104133140153.94196.0012l154150176.72225.00139177160--±2.0201.06256.00158201170226.98289.00178227180254.47324.00200254190283.53361.00223283200--士2.5314.16400.00247314220380.13-298-250490.88-385-注：1．表中的理论质量是按钢的密度为7．85g／crn3计算的。

2．表中带“*”号的规格，不推荐使用。