... : Q235, Q345, SS400, A36, S235JR, S355JR, S45C, S50C, A572, St37, St37-2, ST52 2. Steel PlatesUsed area: Ship building, Engineering construction, Mechanical ... manufacturing, Pavement slab,ect.Material: Q235, Q345, SS400, A36, S235JR, S355JR, S45C, S50C ...