1.hot rolled channel steel 2.length:6m ,9m ,12m 3.material:Q195,Q215, ... Q345 A36 SS400 SS540(3)length:6m,9m,12mGB standard channel steelstandh(mm)b(mm)d(mm)teoretic weight550374.55.438kg ... .463kg/m 30#b300879.539.173kg/m 32#a32088838.083kg/m 32#b320901043.107kg/m 32#c320921248.131kg/m 36#a36096947.814kg/m ...