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Alloy steel and article made therefrom

  • US 7,067,019 B1
  • Filed: 11/24/2003
  • Issued: 06/27/2006
  • Est. Priority Date: 11/24/2003
  • Status: Active Grant
First Claim
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1. 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.

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