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A process of hardening the face of steel, as armor plates, invented by Hayward A. Harvey of New Jersey, consisting in the additional carburizing of the face of a piece of low carbon steel by subjecting it to the action of carbon under long-continued pressure at a very high heat, and then to a violent chilling, as by a…

n 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.