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AB AQ51 Shipbuilding Steel Plate Supplier,China DNV Grade F500 shipbuilding steel plate .AB AQ51 Shipbuilding Steel Plate.The shipbuilding steel plate is ABS grade AQ51.Its steel grade is equivalent with CCS AH500,BV AH500,NV A500,GL-A500,KR AH51,LR AH50,KA51,and RINA-A500.