... -900*300mm 3.length:6/12m q235/q345/ss400 h beam steel specificationh beam1.standardJIS standard, GB/T11263-1998, GB/ ... T11263-20052.steel gradeQ235, Q345, SS4003.size100*100-900*300mm, details ... please check below4.length6m or 12m5.applicationused for machinery, procesing, structure building, automobile manufacturing, shipbuilding, ...