The stainless steel alloys super duplex 2507 and hyper duplex 3207 used in our hulls have been developed by metallurgists at Sandvik Materials Technology AB. These alloys are extremely resistant to saltwater corrosion and fractures. The steel hull retains its mechanical properties despite tough conditions over a long period of time. This is a major advantage compared to fiberglass, carbon fiber and aluminum which may deteriorate over several years. The super duplex and hyper duplex steel’s mechanical properties in combination with the patented design allows our boats to be built with much thinner steel than required for typical steel vessels. Our hulls are lightweight yet durable and rigid - increasing the vessel's loading capabilities and reducing running costs. . The interior consists of modular units that are manufactured and easily installed into predrilled holes in exactly the right position in the boat. The modular system also makes it easy to customize each boat’s interior.


All of our hulls are made of super duplex 2507 and hyper duplex 3207, materials which are up to five times stronger than the strongest aluminum and ordinary steel used in marine applications. The welds on these materials are also far superior to aluminum welds.


The hull's interior structural design is patented by our founder Håkan Rosén and is exclusive to the SSY brand. The unique design allows a more flexible outer skin absorbing the energy in a motion and across a larger area - generating the opportunity to use less material than in a traditional design. The longitudinal stringers spread the load by being locally flexible. This results in an extreme force handling capability where the structural weight is reduced by more than 50 percent compared to a traditional design. All structural members are calculated in FE-analysis software. The structural design complies with world wide classifications societies such as CE/ISO, ABS, DNV GL, BV etc.


Our hull does not require any protective paint, nor does the underwater portion require corrosion protection or antifouling paint. Our hull is Marine Grade® polished/mirror polished, which means that it does not require any antifouling paint when used often enough
at planing speed*. However, we can facilitate painted hulls for yacht applications.

Due to the low surface roughness, barnacles attached to the hull are removed by the force of water during vessel movement. The lower the surface roughness is, the lower the barnacle adhesion strength is. The super duplex stainless steel surface does not corrode or deteriorate and renders a preserved smooth surface. In comparison, other boat building materials deteriorate over time making maintenance more difficult and costly. Our durable and nearly maintenance-free polished steel surface does not require expensive painting or protection applications in order to keep the vessel structurally sound.


All of our vessels** are designed by our in-house Designer, M.Sc Engineer Adrian Falk and his team. We offer high-end modern vessels with the perfect combination of performance and comfort. Mr. Falk and his team achieves the most effective structural design using
modern software (FEM & CAD) used in the cutting edge automotive industry - which is unique in the marine industry. These techniques are especially unique in the ship building industry.


Statistically, failure in operation is most likely caused by an electrical fault. That is why we use professional standard electrical installations on all our vessels which lasts and performs well in tough conditions. Double pole switching is standard, minimizing current leakage and preserving the power bank's capacity. All our vessels aimed for professional use have systems and interiors that are designed to perform with seasonal changes.


There have been attempts to create marine vessels with lighter materials for increased speed and
payload, coupled with decreased fuel consumption. One of the materials currently on the market is aluminum. Aluminum however, is a soft material that fatigues quickly. Over time the aluminum plates must be replaced and re-welded, consuming resources and operational availability.

It is difficult to reuse aluminum in anything other than cans, since aluminum gets fatigues quickly and cannot be reused after it has been heated. In addition, aluminum is sensitive to fire and will lose its strength at 400 celcius.
Aluminum is also sensitive to galvanic corrosion.

Another material that has been used to generate lighter and faster vessels is carbon fiber. However, this material has serious challenges as well. Carbon fiber is not elastic, resulting in difficulties calculating the material, carbon fiber easily develops cracks, which is a large safety concern. In addition, carbon fiber is non-recyclable and very sensitive to fire.

* Verified by empirical evidence on Swedish waters and in R&D project conducted on French Atlantic waters, together with Sandvik Materials Technology AB.
** The first SSY Stainless Steel Yachts POC M 10.5 was designed by Claes Lundström