Saxes, like any other Viking age weapons, were valuable. When they were damaged or worn, the iron was repurposed, and used for some other tool or weapon. This exquisite historical Viking age knife was probably made from a cut-down sax blade.
This image contains a side-by-side comparison between an authentic and reproduction of the Ulfberht sword. Produced by an unknown process for a two-hundred year period, these swords stood far superior in quality to others of the same era.