Performance and Application of 5 Series Marine Aluminum Alloys

According to the different manufacturing processes, marine aluminum alloys can be divided into deformed aluminum alloys and cast aluminum alloys. Because marine aluminum alloys have special requirements for strength, corrosion resistance, and weldability, marine aluminum alloys have many Aluminum-magnesium alloys, aluminum-magnesium-silicon alloys, and aluminum-zinc-magnesium alloys are used. The 5 series aluminum-magnesium alloys are widely used on ships. What are the characteristics of 5-series marine aluminum alloys? ?

There are mainly 5083, 5086, and 5456 aluminum alloys for the 5 series marine products. The intermetallic corrosion of the 6-series alloys occurs in seawater, so the upper structure of the ship is used more. The disadvantage of the 7-series alloy is poor corrosion resistance, so the use range is limited. Taken together, the 5-series marine aluminum plates are currently widely used and promising aluminum alloy products.

5083 aluminum alloy can be regarded as the representative product of 5 series marine aluminum plate, the state is O, H111, H112, H116, H321, etc., 5083 aluminum alloy composition: aluminum Al: balance, 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 alloy has moderate strength, good corrosion resistance and good formability , High fatigue resistance, generally used as the main structure of the hull. Others, such as 5052, 5086, 5454, 5456, are also used in hull structures or pressure vessels, pipelines, hulls, and decks.

In general, the thickness of the sheet is determined by the structure of the hull, the size of the vessel, and the location of use. Considering the lighter weight of the hull, thin plates are generally used as much as possible. However, the depth of corrosion of the plates during use must be taken into consideration. The plate has a thin plate of 1.6 mm or more and a thick plate of 30 mm or more. There are also some special specifications of plates used according to the shipyard contract. For anti-slip, deck decks.

Judging from the development of marine aluminum plates, at present, many aluminum processing factories in China have begun to focus on the development of 5-series and 6-series marine aluminum plates, increasing scientific research, expanding production scale, and entering the high-end manufacturing market for marine aluminum plates. Taking the national aluminum processing leading company Mingtai Aluminum as an example, its aluminum plates such as 5083, 5086, 5454 passed the certification of China Classification Society in 2015, and passed the certification of the Norwegian Classification Society in October, resulting in the “world of foreign trade aluminum plates”. license".

With the development of R&D, innovation and production capacity, the 5 Series marine aluminum plates will welcome greater opportunities for development, providing ample room for the transformation and upgrading of aluminum processing. (This article is contributed by Mintai Aluminum)