Saving the royal warship Vasa

50 years after being raised from the bottom of Stockholm's harbor – Vasa – one of Sweden's most popular attractions, is being rescued again. This time, by a team of metallurgy experts from Sandvik and engineers from the Vasa Museum.

Saving Vasa

Vasa's oak hull was threatened by iron leakage from its steel bolts. See how Sandvik and the Vasa Museum are collaborating to replace 5,500 bolts with new, duplex stainless steel bolts.

Case story

To preserve this national treasure for future generations, a decision was made to replace each one of its 5,500 bolts. The question was – with what?

Read the full case story

Material specs

Replacement bolts for Vasa are made of a combination of Sandvik SAF 2507® super duplex and Sandvik SAF 2707 HD™ hyper-duplex steels.

Read more about the materials

Replacing 5,500 bolts

Each of the 5,500 old, rusty bolts on the warship Vasa need to be replaced. The old steel bolts holding the ship together, started chemically reacting with the oak hull and a major project was necessary to replace each bolt with a long-lasting solution.

Here you can see one of the Vasa bolt-replacement teams at work, removing an old bolt. The new 8-piece bolt construction will be cut to the correct length before being inserted. The new bolts themselves are expected to last for hundreds of years, helping to preserve Vasa for future generations.