... Structural Steel Plate:1)Grade:Q235 A,B Q345 A,B,C,D,E Q390 A,B,C,D,E Q420 A,B,C,D,E Q460 C,D,E 2)Specifications:3)Standard:GB/T3274 ... Hi-strength Structural Steel PlateSteel GradeQ295 A,B Q345 A,B,C,D,E Q390 A,B,C,D,EQ420 A,B,C,D,E Q460 C,D,ESpecifications5-120×1500-3660×LStandardGB/T3274 ...