Durable performance for the oceans

Constellium's aluminium solutions are used by shipbuilders to produce light and fast vessels capable of resisting the corrosive effects of seawater. This is achieved by selecting the most appropriate alloys – right from the boat design phase – and complemented with dedicated surface treatments, cutting-edge production processes, and well-honed manufacturing skills.


Constellium serves the Marine segment with sheets and plates manufactured in compliance with the most renowned certification bodies across the globe. Additionally, as the #1 supplier in Europe for large aluminium extruded bars and profiles, Constellium is the ideal one-stop-shop for service centers and shipyards.

Sealium®, the specialized marine solution for faster and long-lasting ships

Constellium’s Sealium® alloy has been designed to be considerably stronger than other alloys used in shipbuilding, allowing for down gauging while delivering excellent impact resistance and high protection against corrosion. Easy to weld, flexible, easy to shape and bend, it provides superior assembly advantages. Sealium® offers outstanding weight saving opportunities to shipbuilders, designers, manufacturers of long vessels, yachts and ferries, because they demand high performance. Sealium® is available in plate and sheet, as well as hard-extruded product in a wide variety of diameters.

Constellium is organized for and used to working closely with designers and shipyards. Our expertise and these close technical partnerships deliver significant benefits for our customers:

  • Flexibility of design and function
  • Low weight combined with high strength
  • Easy machining
  • High corrosion resistance
  • Less welding required

Large aluminium extrusions

In close cooperation with customers - shipbuilders in Europe, America and Australia - Constellium has developed innovative solutions for the manufacturing of welded structures in large extruded profiles. Large extrusions reduce the amount of welding work required by up to 50%, and lower the extent of welding-related problems such as distortion resulting rectification work.

Key facts

  • Large extruded profiles can reduce weldings by up to 50%
  • Constellium is Europe’s #1 supplier of large profiles