Precipitation hardenable stainless steel
AssigneeCarpenter Technology Corporation
InventorLewis P. Myers
Life of this patent
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Abstract
A chromium-nickel age hardenable martensitic stainless steel containing about up to 0.05% carbon, up to about 0.5% manganese, up to about 0.5% silicon, up to about 0.04% phosphorus, up to about 0.02% sulfur, about 10.5-12% chromium, about 8.5-9.5% nickel, about 2.1-3.0% copper, about 0.7-0.93% aluminum, up to about 0.01% boron, about 0.20-0.55% columbium, and the balance iron plus impurities.
Claims18
A chromium-nickel stainless steel alloy capable of being age hardened to a hardness of at least 44 Rockwell C with an essentially martensitic microstructure having no more than about 10% retained austenite and nor more than about 3% ferrite and in that condition having a 0.2% yield strength of at least about 200,000 psi, an ultimate tensile strength of at least about 210,000 psi, a notch tensile strength at least equal to its ultimate tensile strength, an impact strength in the longitudinal direction of at least 15 ft-lb and at least 5 ft-lb in the transverse direction, said alloy in weight percent consisting essentially of about
- ______________________________________ w/o Carbon up to 0.05 Manganese up to 0.5 Silicon up to 0.5 Phosphorus up to 0.04 Sulfur up to 0.02 Chromium 10.5-12 Nickel 8.5-9.5 Copper 2.1-3.0 Aluminum 0.7-0.93 Boron up to 0.01 Columbium 0.20-0.55 Nitrogen up to 0.04 ______________________________________
- and the balance essentially iron and incidental impurities.
Dependencies are inferred from the claim text.