Metal treatment – Stock – Ferrous
Reexamination Certificate
2007-01-09
2007-01-09
Wyszomierski, George (Department: 1742)
Metal treatment
Stock
Ferrous
C148S328000, C420S038000, C420S107000
Reexamination Certificate
active
10360204
ABSTRACT:
A nanocarbide precipitation strengthened ultrahigh-strength, corrosion resistant, structural steel possesses a combination of strength and corrosion resistance comprising in combination, by weight, about: 0.1 to 0.3% carbon (C), 8 to 17% cobalt (Co), 0 to 10% nickel (Ni), 6 to 12% chromium (Cr), less than 1% silicon (Si), less than 0.5% manganese (Mn), and less than 0.15% copper (Cu), with additives selected from the group comprising about: less than 3% molybdenum (Mo), less than 0.3% niobium (Nb), less than 0.8% vanadium (V), less than 0.2% tantalum (Ta), less than 3% tungsten (W), and combinations thereof, with additional additives selected from the group comprising about: less than 0.2% titanium (Ti), less than 0.2% lanthanum (La) or other rare earth elements, less than 0.15% zirconium (Zr), less than 0.005% boron (B), and combinations thereof, impurities of less than about: 0.02% sulfur (S), 0.012% phosphorus (P), 0.015% oxygen (O) and 0.015% nitrogen (N), the remainder substantially iron (Fe), incidental elements and other impurities. The alloy is strengthened by nanometer scale M2C carbides within a fine lath martensite matrix from which enhanced chemical partitioning of Cr to the surface provides a stable oxide passivating film for corrosion resistance. The alloy, with a UTS in excess of 280 ksi, is useful for applications such as aircraft landing gear, machinery and tools used in hostile environments, and other applications wherein ultrahigh-strength, corrosion resistant, structural steel alloys are desired.
REFERENCES:
patent: 5061440 (1991-10-01), Watanabe et al.
patent: 5310431 (1994-05-01), Buck
patent: 6176946 (2001-01-01), Kuehmann et al.
patent: 6458220 (2002-10-01), Kuehmann et al.
patent: 6464801 (2002-10-01), Kuehmann et al.
patent: 6485582 (2002-11-01), Kuehmann et al.
patent: 6491767 (2002-12-01), Kuehmann
patent: 6-65692 (1994-08-01), None
ASM Handbook, vol. 4, heat treating, ASM, The Materials Information Society, 1991.
Aerospace Material Specification, AMS 6257A, Warrendale, PA, SAE International (2001).
Philip, T. V. and T. J. McCaffrey (1990). Ultrahigh-Strength Steels,Properties and Selection: Irons, Steels, and High-Performance Alloy. Materials Park, OH, ASM International, 1: 430-448.
Aerospace Material Specification, AMS 5659F, Warrendale, PA, SAE International (1998).
Alloy Digest, SS-716. Materials Park, OH, ASM International (1998).
Kimmel, W. M., N. S. Kuhn, et al.,Cryogenic Model Materials. 39th AIAA Aerospace Sciences Meeting & Exhibit, Reno, NV (2001).
Olson, G., B “Computational Design of Hierarchically Structured Materials,” Science 277: 1237-1242 (1997).
Campbell, C.,Systems Design of High Performance Stainless Steels, Materials Science and Engineering, Evanston, IL, Northwestern: 243 (1997).
C.E. Campbell and G.B. Olson, Systems design of high performance stainless steels I. Conceptual and computational design; Journal of Compter Aided Materials Design, 7: 145-170, 2001, # XP009037218, Kluwer Academic Publishers, Netherlands.
Jou Herng-Jeng
Kuehmann Charles J.
Olson Gregory B.
QuesTek Innovations LLC
Wyszomierski George
LandOfFree
Nanocarbide precipitation strengthened ultrahigh-strength,... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Nanocarbide precipitation strengthened ultrahigh-strength,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nanocarbide precipitation strengthened ultrahigh-strength,... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3796597