The performance and application of marine grade aluminium
Marine grade aluminium alloys can be divided into deformed aluminum alloys and cast aluminum alloys according to different manufacturing processes. Because marine aluminum alloys have special requirements for strength, corrosion resistance, weldability, etc., aluminum-magnesium alloys are mostly used for aluminium marine grade. Aluminum-magnesium-silicon alloys and aluminum-zinc-magnesium alloys, of which the 5-series aluminum-magnesium alloys are the most widely used on ships, so what are the characteristics of 5-series marine aluminum alloys?
marine grade aluminium alloy
There are mainly three types of aluminum alloys for 5-series ships: 5083, 5086, and 5456. The 6-series alloy will have intergranular corrosion in seawater, so the ship’s superstructure is used more frequently. The 7-series alloy has the disadvantage of poor corrosion resistance, so the use range is limited. On the whole, the 5-series marine aluminum plate is currently the most widely used and most promising aluminium marine grade product.
The 5083 aluminum alloy can be regarded as the representative product of the 5-series marine aluminum plate, in the state of O, H111, H112, H116, H321, etc. The alloy composition of the 5083 aluminum plate is: Al: balance, Si: 0.40, Cu: 0.10, Mg: 4.0～ 4.9, Zn: 0.25, Mn: 0.40～1.0, Ti: 0.15, Cr: 0.05～0.25, Fe: 0～0.400,
5083 aluminum alloy has medium strength, good corrosion resistance, good formability, and high fatigue resistance. It is generally used as the main structure of the hull. Others, such as 5052, 5086, 5454, 5456, etc., are also mostly used in hull structures or pressure vessels, pipelines, hulls and decks.
Generally speaking, the thickness of the plates used is determined by the hull structure, ship specifications and parts of use, etc. From the perspective of hull lightweight, thin plates are generally used as much as possible, but the depth of corrosion of the plates during the use time should also be considered. Usually used There are thin plates over 1.6mm and thick plates over 30mm. Some special specifications are also used in accordance with the shipyard contract. In order to prevent slip, the deck adopts checkered plates.
From the perspective of the development of marine grade aluminum plates, at present, many domestic aluminum processing manufacturers have begun to focus on the research and development of 5 series and 6 series marine aluminum plates, increase scientific research, expand production scale, and enter the high-end manufacturing market such as marine aluminum plates.
With the improvement of R&D innovation and production capacity, the 5-series marine aluminum plates will usher in greater development opportunities, providing a broad development space for the transformation and upgrading of aluminium marine grade processing.