Sealium
Sealium are combine the best available aluminium alloy for marine applications with optimised section designs. Sealium are to be used when a stronger aluminium structure is required, and whenever weight reduction or increased interior space is crucial.
Sealium perform best when used with Sealium sheets and plates to give the best overall structural performance from same alloy construction.
Sealium optimises the overall productivity of shipbuilders and the performance of vessels in general as it makes them more robust, safer, and user-friendly. In just a few years, Sealium has become the international industry reference for fast ferries.
Chemical Composition of Sealium® Plates (5383 H116) (%)
| % | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Zr | Other (Max) |
| Min | 0.7 | 4.0 | Each: 0.05 | |||||||
| Max | 0.25 | 0.25 | 0.20 | 1.0 | 5.2 | 0.25 | 0.40 | 0.15 | 0.20 | Total: 0.15 |
Note: Al = Remainder
Sealium may be used wherever a stronger welded aluminum structure is desired, from hulls to superstructures. Marine structures benefit from the excellent corrosion resistance offered by Sealium . Smaller boats (<> 50m) profit from the increased strength and improved fatigue behavior of Sealium . Cruise ship superstructures can be lightened further while improving stability and not compromising strength or corrosion resistance.
Sealium Advantages
- 15 % higher welded yield strength than standard 5083 alloy:
- Increased margin of safety from same scantlings.
- Significant weight savings from reduced or modified scantlings.
- Proven improved corrosion resistance.
- Increased fatigue strength.
- Same usage properties as 5083 alloy:
- Formability: same cutting, bending and shaping.
- Welding: no change in welding procedure,consumables or heat deformation.
Marine grade Sealium is tested as per ASTM B209, and therefore capable of exhibiting no evidence of exfoliation corrosion. Intergranular corrosion (IGC) and stress corrosion (SCC) tests (Interacid test and ASTM G44) as well as ASSET tests (ASTM G66) on base and welded metal samples of Sealium show significantly better corrosion resistance than standard 5083-H116. Accelerated (artificial ageing for 7 days at 100¡C) and natural exposure (marine atmosphere and immersion) as well as experience have proven the long term corrosion resistance of Sealium to be markedly improved over that of 5083-H116.
Duralium
Duralium is the trade name of one of the earliest types of age-hardenable aluminium alloys. Duralium was a metallic substance commonly used in aircraft engines, car engines, pressure cooker, and industrial cauldrons, under sea vessels and ships. aircraft alloy and contains aluminium, copper, manganese and magnesium. It is easily worked and can be heat treated to increase tensile strength.
Duralium is also called Duraluminium or duralumin. It is an alloy of Al and Cu. Some traces of other metals such as Mg and Mn are added to enhance the strength of the alloy. The proportion of the metals in duralium Al – 95 %, Cu – 4 %, Mg – 0.5 % and Mg – 0.5 %. You can see that duralium has mostly Al. But duralium is found to be very strong, corrosion resistant.
Duralium was developed by the German metallurgist Alfred Wilm at Dürener Metallwerke Aktien Gesellschaft. In 1903, Wilm discovered that after quenching, an aluminium alloy containing 4% copper would slowly harden when left at room temperature for several days. Further improvements led to the introduction of Duralumin in 1909. The name is obsolete today, and mainly used in popular science to describe the Al-Cu alloy system, or 2000 series as designated by the International Alloy Designation System (IADS) originally created in 1970 by the Aluminum Association.
Its first use was rigid airship frames. Its composition and heat treatment were a wartime secret. With this new rip-resistant mixture, duralumin quickly spread throughout the aircraft industry in the early 1930s, where it was well suited to the new monocoque construction techniques that were being introduced at the same time. Duralumin also is popular for use in precision tools such as levels because of its light weight and strength.
Although the addition of copper improves strength, it also makes these alloys susceptible to corrosion. For sheet products, corrosion resistance can be greatly enhanced by metallurgical bonding of a high-purity aluminium surface layer. These sheets are referred to as alclad, and are commonly used by the aircraft industry.
Duralium Applications
List of typical uses for Duralium (Al-Cu alloys):
- 2011: Wire, rod, and bar for screw machine products. Applications where good machinability and good strength are required.
- 2014: Heavy-duty forgings, plate, and extrusions for aircraft fittings, wheels, and major structural components, space booster tankage and structure, truck frame and suspension components. Applications requiring high strength and hardness including service at elevated temperatures.
- 2024: Aircraft structures, rivets, hardware, truck wheels, screw machine products, and other miscellaneous structural applications.
- 2036: Sheet for auto body panels.
- 2048: Sheet and plate in structural components for aerospace application and military equipment.
- 2141: Plate in thicknesses of 40 to 150 mm (1.5 to 6.0 in) for aircraft structures.
- 2218: Forgings; aircraft and diesel engine pistons; aircraft engine cylinder heads; jet engine impellers and compressor rings.
- 2219: Welded space booster oxidizer and fuel tanks, supersonic aircraft skin and structure components. Readily weldable and useful for applications over temperature range of -270 to 300 °C (-450 to 600 °F). Has high fracture toughness, and the T8 temper is highly resistant to stress-corrosion cracking.
- 2618: Die and hand forgings. Pistons and rotating aircraft engine parts for operation at elevated temperatures. Tire molds.
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