According to the difference of manufacturing process, the marine aluminum alloy can be divided into deformation aluminum alloy and casting aluminum alloy, because of the special requirements of marine aluminum alloy for strength, corrosion resistance, weldability, etc , so the aluminum - magnesium alloy, aluminum - magnesium - silicon alloy and aluminum - zinc - magnesium alloy are used commonly, the 5 series aluminum - magnesium alloy sheet is most widely used on ships, so, what are the characteristics of 5 series aluminum sheet for boat building?
5 series aluminum sheet for boat building mainly are 5083, 5086, 5456 aluminum sheet. 6 series aluminum sheet will have intercrystalline corrosion in seawater, so 6 series usually used as the ship upper structure, the defect of 7 series aluminum alloy is poor corrosion resistance, so the using scope is limited. Taken together, 5 series aluminum sheet for boat building is the most widely used, the most promising aluminum alloy products. 5083 aluminum alloy sheet can be viewed as representative 5 series Marine aluminum plate, the state has O, H111, H112, H116, H321, 5083 aluminum alloy components are Si less than 0.40%, Cu is less than 0.10 %, Mg is 4.0 - 4.9%, Zn is less than 0.25%, Mn is 0.40 to 1.0%, Ti is less than 0.15%, Cr is 0.05 to 0.25%, Fe is 0 ~ 0.4%, 5083 aluminum alloy sheet has medium strength, corrosion resistance and good formability, high fatigue resistance, generally used as a main hull structure. Other types such as 5052, 5086, 5454, 5086 also use in the boat structure or pressure vessel, pipeline, hull and deck, etc. In general, the thickness of aluminum sheet for boat building is decided by boat structure, specifications, and parts, in terms of lightweight, generally use the thin sheet, but considered within the depth of corrosion, over 1.6 mm thin sheet and over 30 mm thick plate are often used.