18的工字钢180mm*94mm*6.5mm理重24.143kg/m40分40a400mm*142mm*14mm67.598kg*m40b400mm*144mm*12.5mm73.878kg/m40c400mm*145mm*14.5mm80.158kg/mHW300*300是H型钢不属于HW是HN300*300*10*1594.5kg/m