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What alloys does the term ‘marine grade’ refer to?

Originally it referred to the 5000 series alloys particularly 5052 and 5251 used in the small boat market. The 5000 series are essentially sheet and plate alloys and the extrusions used in conjunction with these products for the marine industry are the 6000 series alloys. Whilst not originally given the ‘marine grade’ title the 6000 series have been used in the marine industry for over 50 years.