hot rolled U-channel steel bar: material:Q195-Q215-Q235-Q345 kind: U18,U25,U29,U36 lenght:random hot rolled U-channel steel bar:(1) standard: ASTM , BS, JIS , GB(2) material: Q195 - Q235- Q345  etc  (3) kind : U18 , U25 , U29 , U36 etc(4) surface : galvanized or not(5) min...