Patent ID: 7067019

Claim:
A deep hardening Cu/Ni/Cr alloy steel for reducing the cost of high toughness, high strength steels, by eliminating the use of the scarce high cost alloying elements cobalt and molybdenum comprising by weight: about 0.22–0.55% carbon, about 0.40–1.0% copper; about 0.80–3.5% of chromium; about 2.5–8.0% nickel; about 0.55–1.50% of silicon, said silicon and said copper being present in a Si to Cu weight ratio of about 1.2–2.5; about 0.15–1.50% manganese; at least one transitional element from the group consisting of vanadium in about 0.10–1.00% by weight and titanium in about 0.10–0.65% by weight; Co and Mo eliminated as alloying constituents; and the remainder iron and incidental impurities.