... ,SS400,Q345B,Q345 SS400-SS490 Q235 standard:GB/T700-1988 H beam is an new production for construction and easy to ... weight,strong rigidity ,high quality and fine appearance,after using h beams,30%-50% constructiontime can be decreased and 5% useage ... and electrical power.5 strucure of large spread steel bridge6 Frame structure in marine and mechanical area7 large beams of trains ...