Metal treatment – Stock – Nickel base
Reexamination Certificate
2005-07-19
2005-07-19
Sheehan, John P. (Department: 1742)
Metal treatment
Stock
Nickel base
C148S671000, C420S446000, C420S450000
Reexamination Certificate
active
06918972
ABSTRACT:
A Ni-base alloy which has excellent resistance to permanent set at high temperature and which can be produced at low cost, a heat-resistant spring made of the Ni-base alloy, and a process for producing the spring. The Ni-base alloy of the present invention consists of 0.01 to 0.15 mass % of C, 2.0 mass % or less of Si, 2.5 mass % or less of Mn, 12 to 25 mass % of Cr, 5.0 mass % or less of Mo and/or 5.0 mass % or less of W on condition that Mo+W/2 does not exceed 5.0 mass % or less, 1.5 to 3.5 mass % of Ti, 0.7 to 2.5 mass % of Al, 20 mass % or less of Fe, and the balance of Ni and unavoidable impurities. The ratio of Ti/Al in terms of atomic percentage ranges from 0.6 to 1.5 and the total content of Ti and Al ranges from 4.0 to 8.5 atomic %.
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Noda Toshiharu
Ueta Shigeki
Daido Tokushuko Kabushiki Kaisha
Frishauf Holtz Goodman & Chick P.C.
Sheehan John P.
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