Carbon steel I Beam Grade:Q235B,Q345,SS400,A36,etc. Size: 100*68mm-630*180mm Length:6-12m Best quality,best price We are ... a biggest Structural steel supplier inTangshan,China,mainly focur ... meantime,we are a first agent of Jinxi Steel Group,Laiwu Steel goup and Changzhi Steel group,which are three of the biggest ...