方钢管，就是横截面为方形的空心薄壁钢管材，一般都是由带钢经过工艺处理卷制而成。
方钢管的理论重量计算方法比较简单，计算公式为： 方钢管理论重量W（Kg/m)=4*壁厚*（边长-壁厚）*7.85 方钢管理论重量表： 边长
(mm)截面面积(cm2)理论重量(kg/m)边长
(mm)截面面积(cm2)理论重量(kg/m) 50.250.196309.007.0660.360.2833210.248.0470.490.3853411.569.0780.640.5023612.9610.1790.810.6363814.4411.24101.000.7854016.0012.56111.210.954217.6413.85121.441.134520.2515.90131.691.334823.0418.09141.961.545025.0019.63152.251.775328.0922.05162.562.015631.3624.61172.892.276036.0028.26183.242.546339.6931.16193.612.826542.2533.17204.003.147049.0038.49214.413.467556.2544.16224.843.808064.0050.24245.764.528572.2556.72256.254.919081.0063.59266.765.309590.2570.85287.846.15100100.0078.50
方钢管横截面示意图： 
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