... ,SS400,etc. 2.QB, JIS, European standard 3.length is 6m---12m. hot rolled channel steel Grade: Q235B, SS400, Q235, Q345, Q345B ... ,SS400,etc. 2.QB, JIS, European standard 3.length is 6m---12m. size (mm)thickness (mm)thickness (mm)weight (kg/m)50 ...