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Alema is a Swedish steelmaker that makes
products out of advanced stainless steel and
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special alloys.
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The company, formerly Sandvik Materials
Technology, was officially spun out of Sandvik
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in 2022 and has more than 900 active alloy
recipes.
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The company typically makes seamless steel
tubes for the energy,
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chemical, and aerospace industries, Precision
strip steel for white goods,
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and even ultrafine wires for medical and
microelectronic devices.
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But the company recently found itself facing a
unique challenge.
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The crumbling remains of a nearly 400 year old
ship on August 10th,
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1628, the Vasa cast off from below Trey Cronor
Castle in Stockholm
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and left the harbor.
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She was a mighty ship with 3 masts that could
carry 10 sails measuring 52 m from tip to
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keel, 69 m long and weighed 1200 tons.
The vassa was hit with a
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mighty gust from the gods that caused her to
capsize.
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Water poured through the open ports.
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The vasa sank to the floor of the sea, and at
least 30 of the 150 or so board perished.
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About 333 years later, divers found the Vasa.
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On April 24, 1961, more than 14,000 loose
pieces of wood were pulled from
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the sea, and the ship was salvaged, but it has
taken a huge effort to preserve it.
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Now on display at the Wassa Museum in Stockholm,
the ship is incredibly fragile.
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Chemical degradation of the wood has caused the
old oak hull to lose much of its strength,
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so the museum reached out to Alema to make an
inner.
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Steel skeleton, a truss built out of tubes to
stabilize the hull.
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According to the museum, saving the Vasa has
been the biggest challenge facing the ship
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since its salvage.
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The skeleton will be made out of a high alloy
SAF 2507 stainless steel material.
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The inner steel skeleton will reach from the
keel to the upper deck and support the loads
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from the deck and deck beams.
However, the inner steel support must be.
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Strong and light, and Alema will use a design
that prevents the project from drilling too
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many holes in the hull.
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Because the material is so strong, the skeleton
will require less of it,
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and the steel’s high corrosion resistance
allows it to come into direct contact with the
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ship without being affected by acid given off
by the wood.
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The project should be completed by 2028, which
lines up with the ship’s
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400th anniversary.
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And this isn’t Alema’s first voyage with the
Vasa in 2011,
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then owned by Sandvik, the company replaced
more than 5000 rusty bolts with a specially
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developed high alloy part.
The bolts made the ship more stable and also
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shed some 8 tons from the ship’s overall weight,
about the equivalent of a yellow school
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bus.
I’m David Bainty, and this is manufacturing now.