China ASTM A387 Alloy Steel Plate Supplier: ASTM A387 Grade 9 Class 2 Plate, Hot Rolled, Size 1680mm x 5800mm x 16mm. Product: ASTM A387 Grade 9 Class 2 Alloy Steel Plate. Material: ASTM A387 Grade 9 Class 2. Manufacturing: Hot Rolled. Size: 1680mm x 5800mm x 16mm.