Marine aluminium plate 5083 alloy are used to manufacture the hull structure produced with the certificate of DNV and CSS. Due to the harsh working environment of the marine ship, the hull shell is subject to chemical corrosion of seawater, electrochemical and marine organisms and microorganisms; the hull is subjected to large wind and wave impacts and alternating loads; the shape of the ship is complicated by processing methods, etc. The the marine aluminum aluminium alloy to process hull structure is strictly required.
Aluminum alloy 5083 is the typical marine grade aluminum, the aluminum plate 5086 and aluminium plate 5083 usually used in shipbuilding industry, and the common temper are H116. The alloy content of aluminum alloy 5083 are: Al: reminder, Silicon Si: ≤0.40, Copper Cu : ≤ 0.10, Magnesium Mg: 4.0 to 4.9, Zinc Zn: ≤ 0.25, Manganese Mn: 0.40~1.0, Titanium Ti : ≤ 0.15, Chromium Cr: 0.05~0.25, Iron Fe: 0.000~ 0.400. The properties of 5083 aluminum plate are: Tensile strength σb (MPa): ≥ 270, Conditional yield strength σ0.2 (MPa): ≥110, elongation δ10 (%): ≥20, elongation δ5 (%): ≥12.
The performance requirements of marine aluminium plate 5083 are very strict. First, good toughness is the most critical requirement. In addition, high strength, good corrosion resistance, weldability, processability and surface quality are required. In order to ensure the quality and ensure sufficient toughness, the chemical composition of Mn/C is required to be above 2.5, and the carbon equivalent is also strictly required, and is produced by the manufacturer approved by the ship inspection department. The main classification society of marine grade aluminum are: China CCS, USA ABS, Germany GL, France BV, Norway DNV, Japan KDK and UK LR.
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