... , European standard 3.length is 6m---12m. hot rolled channel steel Grade: Q235B, SS400, Q235, Q345, Q345B, ST37-2, A36, S235JRG Technique ... size: 50*25*3mm-300*90*13mm5#---40AB# Channel steel 1.Q195-235,SS400,etc. 2.QB, JIS, European standard 3.length ... .60300*909.0013.0038.10 Hot Rolled JIS and G/B Channel Steel