Krupp process

Krupp process \Krupp process\ (kr[oo^]p) n. (Iron Metal.)
   (a) A process practiced by Friedrich Krupp, Essen, Germany,
       for washing pig iron, differing from the Bell process in
       using manganese as well as iron oxide, and performed in a
       Pernot furnace. Called also the {Bell-Krupp process}.
   (b) A process for the manufacture of steel armor plates,
       invented or practiced by Krupp, the details of which are
       secret. It is understood to involve the addition of
       chromium as well as nickel to the metal, and to include a
       treatment like that of the Harvey process with unknown
       variations or additions. The product is mentioned by some
       authors, as improved Harvey, or Harvey-Krupp armor plate.
       [Webster 1913 Suppl.]