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

Aluminium Powders for Additive Manufacturing

Aluminium Additive Manufacturing is gaining attention in many areas, including in the Marine industry. Constellium, with decades of knowledge in rapid solidification metallurgy, has developed two revolutionary additive manufacturing alloys that fit the needs of this technology-driven industry. These new products are perfectly aligned with the requirements of powder bed fusion and the performance requirements for marine components.

Aheadd® HT1

Aheadd® HT1 is the most suitable additive manufacturing alloy for applications which need high strength and service temperatures up to around 250°C.

Aheadd® CP1

Aheadd® CP1 is an additive manufacturing alloy packed with many features, including high strength and ductility, excellent surface finishing characteristics and thermal and electrical conductivity approaching that of pure aluminium. .

This alloy is also a cost-effective alternative for almost every current aluminium AM application due to its very high printing speed and simplified post-processing, which make Aheadd® CP1 the solution of choice both for rapid prototyping and series production.

For both alloys, the properties of the components produced can be customized by fine-tuning the post-build stress-relief treatment. This simplifies post-processing by eliminating the need to solution treat, quench and age, and also minimizes the risk of distortion of printed components during post processing.

Targeted Market, Application & Value drivers




Target Segment 

Aheadd® HT1

Aheadd® CP1

Application areas


Application areas


High performance boats



• Engine components with service temperatures above 150°C;


• Complex structural components.

• High strength at low and elevated temperatures;


• High thermal stability;


• Good corrosion resistance;


• Robust AM process window with good productivity;


• Geometric control: simplified post-processing with no quench requirement.

• Heat exchangers with complex geometries (including service temperatures above 150°C);


• Components or housings which need good thermal or electrical conductivity e.g. in hybrid/electric vehicles;


• Rapid prototyping;


• Large & complex components;


• Visible parts (aesthetics);


• Cost-effective improvement of existing aluminium AM solutions in Al-Si alloys.

• High thermal stability;


• High thermal and electrical conductivity;


• High strength and ductility;


• Ability to print highly complex & large parts without cracking;


• Geometric control: low residual stresses, simplified post-processing with no quench requirement;


• Excellent surface finishing capabilities (polishing/anodizing);


• Cost reduction: high printing productivity and reduced need for support structures (no quench).