Most recent Nokia phones use Gorilla Glass by Corning to protect their screens from scratches and cracks (as do most smartphones out there). The latest Nokia 8.1 skips GG in favor of another brand of strengthened glass Dinorex by NEG.
NEG is a Japanese company (Nippon Electric Glass) and uses a similar process to Corning depositing potassium ions on the surface of the glass to toughen the glass. Its already used by several phones including models by ZTE (e.g. the nubia Red Magic Mars), Meizu and BQ.
While Corning is dominant, there is some competition. For example, Sony has used Dragontrail glass by Asahi in the past. There are a few phones from Samsung, TCL (BlackBerry and Alcatel) that use it too.