... Carbon Steel I-beam 1. Standard: GB&JIS 2. Grade: Q235B,SS400 3. Length: normal 10m and 12m 4.Tolerance:3-10% Carbon ... Steel I-beam1)Material:SS400,ST37-2,A36,S235JRG1,Q235,Q345 ... steel ,made of grade Q235 material.2 Products are: carbon structural steel, low alloy structural steel, low alloy steel ... a variety of steel the customer wanted. Carbon Steel I-beam