Lower-Cost, Ultra-High-Strength, High-Toughness Steel

摘要

A non-stainless steel alloy includes, in combination by weight, about 0.20% to about 0.33% carbon, about 4.0% to about 8.0% cobalt, about 7.0 to about 11.0% nickel, about 0.8% to about 3.0% chromium, about 0.5% to about 2.5% molybdenum, about 0.5% to about 5.9% tungsten, about 0.05% to about 0.20% vanadium, and up to about 0.02% titanium, the balance essentially iron and incidental elements and impurities.

主权项

1. A non-stainless steel alloy comprising, in combination by weight:
about 0.20% to about 0.33% carbon, about 4.0% to about 8.0% cobalt, about 7.0% to about 11.0% nickel, about 0.8% to about 3.0% chromium, about 0.5% to about 2.5% molybdenum, about 0.5% to about 5.9% tungsten, about 0.05% to about 0.20% vanadium, and titanium up to about 0.02%, the balance essentially iron and incidental elements and impurities said alloy having a microstructure characterized by MC grain refinement particles by inclusion of principally M2C carbide particle precipitates wherein M2 is comprised of one or more elements selected from the group consisting of chromium (Cr), molybdenum (Mo), tungsten (W), and vanadium (V) in a predominately lath martensite matrix, said alloy further characterized by the combination of high strength, high fracture toughness (Klc) and enhanced stress corrosion cracking resistance (Klscc).