superharden
verb
su·per·hard·en
ˌsü-pər-ˈhär-dᵊn
superhardened; superhardening; superhardens
: to make (something) extremely hard
… enclosed in steel cases superhardened with a proprietary technology by a company that treats jet turbine blades …—Richard Nalley
superhardened missile silos
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Merriam-Webster unabridged
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