With the development of the times, the material of the hull has developed from steel plates to aluminum plates. 5083 h111 aluminum plates and 5083 h112 aluminum plates are commonly used best aluminium sheet for marine grade. The marine aluminum plates produced by Mingtai Aluminum have DNV and CSS certification. So what are the advantages of marine aluminum plates? Professionals from Mingtai Aluminum will explain to you.
best aluminium sheet for marine grade requires high specific strength and specific modulus
The yield strength and elastic modulus of the material are the most basic parameters for calculating the strength of the ship structure and determining the size of the structure. Since the elastic modulus and density of various aluminum alloys are roughly the same, and adding a small amount of alloying elements or changing the heat treatment state has little effect on them, increasing the yield strength within a certain range is beneficial to reducing the weight of the ship structure. The density is about 2.7~2.8/cm3, and the elastic modulus is about 70~73GPa.
However, it is usually difficult for high-strength aluminum alloys to have excellent corrosion resistance and weldability at the same time. Therefore, the best aluminum sheet for marine grade generally selects medium-strength and corrosion-resistant weldable aluminum alloys. In addition, cast aluminum alloys also have a certain degree in the field of ships. Applications.
2. The best aluminium sheet for marine grade requires excellent welding performance
For ships, welding connection has obvious advantages over riveting connection. Therefore, welding connection method has been widely used in shipbuilding and basically replaced riveting structure. At present, automatic argon arc welding method is mainly used in aluminum ship construction.
The good weldability of aluminum alloy means that the tendency of cracks formed during welding of aluminum alloy is smaller, that is, aluminum alloy has good welding crack resistance, and the performance of the welded joint after welding does not change much. Because the performance lost by welding cannot be restored by reheat treatment under the conditions of shipbuilding, this is one of the important characteristics that distinguish the best aluminium sheet for marine grade from other structural aluminum alloys.
3. The best aluminium sheet for marine grade requires excellent corrosion resistance
Ship structures are mostly used in harsh sea water media and marine environments, so whether aluminum alloy is corrosion resistant is one of the main indicators that determines whether it can be used as the best aluminium sheet for marine grade. It is generally required that the best aluminium sheet for marine grade substrate and welded joints have no stress corrosion, spalling corrosion and intergranular corrosion tendency in seawater and marine environments; contact corrosion, crevice corrosion and sea creature adhesion corrosion should be avoided as much as possible; less uniform Corrosion and pitting.
4. Best aluminium sheet for marine grade requires good cold and hot forming properties
During the construction process, the ship must undergo cold processing (such as hemming, curling, roll bending, stamping, etc.) and thermal processing (such as hot bending, pyrotechnics, etc.). Therefore, the best aluminium sheet for marine grade is required to be easy to process and shape, without cracks and other defects during processing, and still meet the performance requirements of strength and corrosion resistance after processing.