... ,SS400 3. Length: normal 10m and 12m 4.Tolerance:3-10% Steel Structure I Beam1)Material:SS400,ST37-2,A36,S235JRG1,Q235 ... 388*402*15*15141 390*300*10*16107 1 it's hot rolled h-beam steel ,made of grade Q235 material.2 ... are: carbon structural steel, low alloy structural steel, low alloy steel, bridge and hull used structural steel and weathering steel. I-beam steel: 10a-56c; U ...