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方形冷弯型钢方形空心冷弯型钢(点击图形查看详细参数) 【规格范围】A×A×t=20×20×1.0~500×500×14.0【执行标准】GB/T6728产品描述 部分常用规格断面参数边长Amm允许偏差mm壁厚tmm理论重量kg/m截面面积cm2惯性矩cm4截面模数cm3回转半径cm20×20±0.502.01.051.340.690.690.7230×30±0.503.02.3613.0083.52.3331.07840×40±0.504.04.1985.34711.0645.5321.43850×50±0.504.05.4546.94723.7259.491.84760×60±0.604.06.718.5543.614.52.2670×70±0.654.07.9710.172.120.62.6780×80±0.704.09.2211.811127.83.0790×90±0.754.010.513.416236.03.48100×100±0.904.011.714.9522645.33.89120×120±0.906.020.7526.43562.193.74.61125×125±0.906.021.027.636411034.82140×140±1.1010.037.547.712681815.15150×150±1.206.026.433.6311501535.84160×160±1.201043.755.719902495.97180×180±1.408.041.552.825462836.94200×200±1.608.046.559.235673577.75220×220±1.8010.062.679.756755168.43250×250±2.0010.072.091.785686859.67260×260±2.2010.075.195.7971574710.1280×280±2.2012.099.712714690104910.8300×300±2.4012.010413217767118411.6350×350±2.8014.01531653205417601406400×400±3.2014.016320850414252115.6450×450±3.6014.018523673210325417.6500×500±4.0014.0207264102010408019.6紫色部分为双焊缝方形管