According to different manufacturing processes, marine aluminum for boat building can be divided into deformed aluminum plate and cast aluminum plate. Because marine aluminum plate has special requirements for strength, corrosion resistance and weldability, so marine aluminum plate for boat building mostly uses aluminum magnesium alloy, aluminum magnesium silicon alloy and aluminum zinc magnesium alloy. Among them, 5000 series aluminum magnesium alloy is most widely used in ships. So, what are the characteristics of 5000 series marine shipbuilding aluminum plate?
There are mainly 5083, 5086 and 5456 aluminum plates for 5000 series aluminum plate for ships. Intergranular corrosion will occurs if 6000 series aluminum alloy applied in sea water, so the superstructure of ships is widely used. The disadvantage of 7000 series aluminum alloy is poor corrosion resistance, so its application range is limited. Generally speaking, 5000 series marine aluminum plate is the most widely used and the most promising aluminum plate product. 5083 aluminum plate can be regarded as the representative product of 5000 series marine aluminum plate, with the state of O, h111, h112, h116, H321, etc. the alloy composition of 5083 aluminum plate is silicon Si: ≤ 0.40, copper Cu: ≤ 0.10, magnesium mg: 4.0-4.9, zinc Zn: ≤ 0.25, manganese Mn: 0.40-1.0, titanium Ti: ≤ 0.15, chromium Cr: 0.05-0.25, iron Fe: 0-0.400. 5083 aluminum plate has medium strength, good corrosion resistance and formability, and resistance to corrosion The fatigue degree is high, which is generally used as the main structure of the hull. Others, such as 5052, 5086, 5454, 5456, etc., are also commonly used in hull structures or pressure vessels, pipelines, hulls and decks.
Generally speaking, the thickness of the aluminum for boat building is determined by the hull structure, the ship specification and the parts used. Generally, the thin aluminum plate is used as far as possible from the perspective of hull lightweight, but the corrosion depth of the aluminum plate for boat building in the service time should also be considered. Generally, the aluminium plate used is more than 1.6mm thin plate and more than 30mm thick plate. There are also some plates of special specifications used according to the shipyard contract.