不等边角钢理论重量计算钢材理论重量计算的计量单位为公斤（kg ）。其基本公式为：W （重量，kg ） = F（断面积 mm2 ）x L （长度，m ）x p （密度，g/cm3 ）X 1/1000钢的密度为：7.85g/cm3 ，各种钢材理论重量计算公式如下：名称（单位）计算公式符号意义计算举例不等边角钢（kg/m）W= 0.00785 X d （ B+b ?C d ） +0.215（ R2 ?C 2 r 2）B=长边宽b=短边宽d=边厚R=内弧半径r=端弧半径求30 mmx 20mmX 4mm不等边角钢的每 m重量。从冶金产品目录中查出30 X20 X4不等边角钢的 R 为 3.5 , r 为 1.2，则每 m 重量=0.00785 X 4 X（ 30+20 ?C 4 ） +0.215 X（ 3.52 ?C 2 X 1.2 2 ）= 1.46kg型号尺寸（mr）理论重量（kg/m）长边宽短边宽边厚251630.9122.5/16251641.1763.2/2322031.171322041.5224/2.5402531.484402541.9364.5/2.8452831.687452842.2035/3.2503231.908503242.494563632.1535.6/3.6563642.818563653.466634043.1856.3/4634053.920634064.638634075.339704543.5707/4.5704554.403704565.218704576.0117.5/5755054.808755065.699755087.4317550109.0988/5805055.005805065.935805076.848805087.7459/5.6905655.661905666.717905677.756905688.77910/6.31006367.5501006378.7221006389.878100631012.14210/81008068.3501008079.65610080810.946100801013.47611/71107068.3501107079.65611070810.946110701013.47612.5/812580711.06612580812.511125801015.474125801218.33014/914090814.160140901017.475140901220.724140901423.90816/101601001019.8721601001223.5921601001427.2471601001630.83518/111801101022.2731801101226.4641801101430.5891801101634.64920/12.52001251229.7612001251434.4362001251639.0452001251843.588