... , AH40, DH40, EH40, 2H Grade 50Alloy Structural Steel Plate: Standard: Special ConditionGrade: 50Mn2V, 15CrMo, 20Mn2, ... Q370qC, Q420qC Building Structural Steel Plate: GB Q235GJC, Q345GJC, Q390GJC, Q420GJC, Q460GJCHigh Quality Carbon Steel Plate: 1>. ASTM ... 50# Wear Resistant Steel Plate: Standard: Special ConditionGrade: NM360A, NM360B, NM400A, NM400B Mould Steel Plate: Standard: Special ...