ABS Certification Marine Aluminium Grades 5083 5383
Among the many grades of aluminum alloys, marine aluminum alloy are all 5xxx alloy. The main element is magnesium. Its magnesium content is 3% to 5%. The Al-Mg alloys feature low density, high tensile strength and high elongation. 5xxx aluminum alloys with the tempers H321 and H116 are currently one of the most widely used marine aluminum plates.
As a non-heat treatable strengthened alloy, the main strengthening methods of Al-Mg alloy are solid solution strengthening and deformation strengthening. As the Mg content increases, the mechanical strength of the Al-Mg alloy gradually increases, but the supersaturated magnesium element tends to preferentially precipitate at the grain boundaries during the processing, leading to the increased susceptibility to intergranular corrosion and stress corrosion of the alloy.
In 1954, the American Aluminum Association registered 5083 alloy, which is regarded as an essential material for ships. It is also widely used in many other fields. With high strength, corrosion resistance, good plasticity and welding properties, 5083 aluminum alloy quickly gained popularity in the shipbuilding industry. Until now, among all aluminum alloys, 5083 alloy has almost no competitors. Aluminum 5083 h32 is its common temper.
In 1995, the French company Péchine registered an improved version of 5083 - 5383 aluminum alloy. This alloy has increased corrosion resistance and increased impact strength by 10%. As the annealing temperature increases, the tensile strength and yield strength of the cold-rolled 5383 aluminum plate gradually decrease, and the elongation after fracture gradually increases. As the cold-rolling processing rate increases, the recrystallization temperature decreases.
The intergranular corrosion resistance of cold-rolled 5383 aluminum alloy increases with the annealing temperature, showing a trend of first decreasing and then increasing. The intergranular corrosion resistance is the lowest after annealing at 150℃, and the intergranular corrosion resistance after annealing at ≥225℃ is good.
As the annealing temperature increases and the cold rolling processing rate decreases, the spalling corrosion resistance of cold-rolled 5383 aluminum plate increases. 5383 aluminum alloy has high strength and good corrosion resistance after cold rolling with a processing rate of 30%~45% and annealing at 225℃~250℃ and holding for 3 hours.
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