TPT May 2011

The Vasa Museum | Sören Johnsson | Product Manager | Stockholm, Sweden

Would you trust a national treasure to anything but superior technology?

The royal warship Vasa is once again in danger.After 50 years in the humid environment of the museum that bears its name, steel bolts installed during theVasa’s reconstruction in 1961 are emitting harmful iron to the ship’s oak hull. Each bolt must now be replaced. The search for a better bolt material led to Sandvik and the company’s experts on special steel applications. Having considered all the factors involved, including the environment of the bolt holes, Sandvik recommended the use of advanced duplex stainless steels. ”This is an unusual but challenging application for duplex steel”, says Product Manager Sören Johnsson. ”We have established a close relation with the engineers of the museum to refine the bolt design, develop machining methods and evaluate the optimum material grades. After thorough testing, Sandvik SAF 2707 HD ™ hyper-duplex stainless steel was proven to provide the exceptional strength and long material life needed to stabilize Vasa for at least another 100 years.”

CHALLENGE

YOUR EXPECTATIONS

www.smt.sandvik.com/vasa