TAH40 steel plate is the mainly kinds of steel for shipbuilding and oil platform, the shipbuilding grade AH40 can be used in the manufacture of the ships hull structure, whose weight is more then 10000 tons.  Shipbuilding grade AH40  is the high tensile strength steel,  AH40 steel for shipbuilding and oil platform must be good toughness properties, higher strength, strong corrosion-resistance, the processing properties, and welding properties.