... 1998, GB/T11263-2005 3.size:100*100-900*300h type steelh beam 1. ... 20052.steel gradeQ235, Q345, SS4003.size100*100-900*300mm, details please check below4. ... 100*100 , 125*125, 150*75, 150*150, 148*100, 198*99, 200*100, 248*124, 250*125,200*200, 250*250, 250*255, 294*200, 298*149, 300 ... *150, 340*250, 346*174, 350*175, 396*199, 400*200, 446*199, 450*200 ...