superharden
verb
su·per·hard·en ˌsü-pər-ˈhär-dᵊn 
superhardened; superhardening; superhardens
transitive verb
: to make (something) extremely hard
… enclosed in steel cases superhardened with a proprietary technology by a company that treats jet turbine blades …
Richard Nalley
Richard Nalleysuperhardened missile silos
Word History
First Known Use
1874, in the meaning defined above
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