... EH36, AH40, DH40, EH40, 2H Grade 50Alloy Structural Steel Plate: Standard: Special ConditionGrade: 50Mn2V, 15CrMo, 20Mn2, 40Mn2, 20MnSi ... >. GB Q235qC, Q345qC (16Mnq), Q370qC, Q420qC Building Structural Steel Plate: GB Q235GJC, Q345GJC, Q390GJC, Q420GJC, Q460GJCHigh Quality ... (L420), X65, X70Quenching and Tempering High Tensile Steel Plate: Standard: Special ConditionGrade: WH70Q, WQ590D, Q550D The ...