Sanlorenzo 50Steel
- LOA: 50 m
- Beam: 9.3 m
- Accommodation: 10 guests, 9 crew
- Engines: twin MAN D2862, about 1,066 kW each
- Top speed: about 16 knots
- Gross tonnage: about 499 GT
- Green technology: green-methanol reformer fuel cell developed with Siemens Energy, powering hotel loads up to 100 kW with the engines off
- Design: exterior by Zuccon International Project, interior by Piero Lissoni, HER engine room freeing a lower level for a 135 sq m beach club, first delivered 2024
A landmark in the Steel line
The 50Steel belongs to Sanlorenzo's Superyacht Division, the metal side of the yard that builds steel and aluminium yachts. At 50 metres and around 499 GT it is a full displacement superyacht, and it arrived in 2024 carrying two genuine firsts. It is the boat where the yard's long research into clean power and clever volume finally reached the water. Above it in the Steel line sits the larger 64Steel.
For Sanlorenzo, the 50Steel is the flagship of its sustainability programme, the Road to 2030. It shows the yard's argument to owners, that a superyacht can be both cleaner and more liveable through real engineering. The boat is built to individual order like the rest of the fleet. It stands as a statement of where Sanlorenzo intends to lead.
Design that opens up
The exterior is by Zuccon International Project, drawn with five gently staggered decks that give the 50Steel a balanced, elegant profile. The interior is by Piero Lissoni, the yard's art director, with the calm, hospitality-inspired style he brings across the fleet. The design is quiet and material-led, letting the sea and the light do the work. The whole boat reads as understated for its size.
The headline design move is the HER engine room, which lays the machinery out horizontally on a single level. That frees a whole extra level low in the hull, given over to an ocean lounge with a large aft beach club, a spa and a gym in one open space. The beach club opens to more than 135 square metres at the waterline. It turns the lower deck into a place to live right at the surface of the sea.
The first superyacht to run a green-methanol fuel cell, with a beach club where the engine room used to sit.
Living at the waterline
Inside, the 50Steel accommodates ten guests and carries a crew of nine. The freed lower level gives the boat a beach-club and wellness area of a size usually found on much larger yachts. Above, the main and upper decks follow Lissoni's restrained, residential language, with generous glazing and long sight lines. Owners can tailor the arrangement and finish closely within that framework.
The design is built around the connection between the interior and the sea, especially at the stern where the beach club opens on three sides. Time aboard is meant to be spent at the waterline as much as in the saloon. The volume is spent on shared, social spaces. It is a superyacht drawn around how a family actually uses the days at anchor.
The green-methanol fuel cell
The 50Steel is the world's first superyacht to carry a green-methanol reformer fuel cell, a patented system Sanlorenzo developed with Siemens Energy. The system draws hydrogen from green methanol and turns it into electricity, powering the yacht's hotel loads up to 100 kilowatts while the main engines and generators stay off. That means silent, emission-free time at anchor. It is the clearest proof yet of the yard's Road to 2030.
Under way, the boat is driven by twin MAN engines of around 1,066 kilowatts each, giving a top speed of about 16 knots in keeping with its displacement character. The fuel cell handles the quiet hours at rest, cutting reliance on the generators. The engineering is a genuine first for the sector, proven on a boat that reached the water in 2024. It gives the 50Steel a real head start on emissions.
Who the 50Steel suits
The 50Steel suits the owner ready to step into a full steel superyacht who wants both a landmark clean-power system and a reordered interior that opens the lower deck to the sea. It appeals to buyers who value being first with real technology as much as space and finish. Its beach-club and wellness volume suits families who live at the waterline. For a long-standing Sanlorenzo owner, it is the move into the metal ranges with a conscience.
In the market it stands apart, since no rival offers a green-methanol fuel cell at this size. That distinction is central to its appeal. For an owner who wants a superyacht that points to the future, the 50Steel answers directly. It carries the yard's clearest environmental statement to the water.
Who it is for: An owner who wants a landmark clean-power superyacht that opens its lower deck to the sea.