A mystery sword made by the Vikings and engraved with the word Ulfberht has stumped archaeologists. The sword is forged in such a way that it looks to have been made by technologies that weren’t available until 800 years after the Viking era.
Around 170 of the swords have been found, all of which date from between 800AD to 1000AD, but the technology that would have forged them is from the Industrial Revolution of the 1800s and 1900s.
A television programme has looked into the mystery in more detail called, ‘Secrets of the Viking Sword’. Its researchers say that to forge the iron which the swords are made of, the ore needs to be heated to around 3000 degrees (F).
It then liquefies and the impurities are removed. It is then mixed with carbon to strengthen the iron. However medieval technologies, which are what the Vikings would have been using, would not have been able to heat any metal or substance that high a temperature. In those days, the impurities would have been removed by hammering them out of the iron.
In contradiction to this, the Ulfberht contains almost no impurities at all and it has thrice the amount of carbon in it than any other metals that are known to have existed at the time. The metal the swords are made of is known as crucible steel.
Furnaces that could heat metals and substances to extremely high temperatures what not invented until the industrial revolution when the tools for heating iron to these temperatures were also developed.
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