Metal treatment – Stock – Carburized or nitrided
Reexamination Certificate
2005-03-22
2005-03-22
King, Roy (Department: 1742)
Metal treatment
Stock
Carburized or nitrided
C148S328000, C148S225000, C148S622000
Reexamination Certificate
active
06869489
ABSTRACT:
A steel for a high bearing pressure-resistant member, having a high machinability. The steel is formed of a machine structural steel comprising carbon in an amount ranging from 0.15 to 0.25% by weight, silicon in an amount of not less than 0.4% by weight, nickel in an amount ranging from 1 to 3% by weight, chromium in an amount ranging from 1.2 to 3.2% by weight, and molybdenum in an amount ranging from 0.25 to 2.0% by weight. The machine structural steel contains carbide precipitated under a heat treatment for spheroidizing. The carbide has an average particle size of not larger than 1 μm and the maximum particle size of not larger than 3 μm.
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Bramfitt et al, “Annealing of Steel”, ASM Handbook, vol. 4 Heat Treating, 1991, pp. 42, 46, 47.*
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Kimura Toshimitu
Nakayama Tatsuomi
Uchiyama Noriko
Ueda Hiroo
Foley & Lardner LLP
King Roy
Nissan Motor Co,. Ltd.
Wilkins, III Harry D.
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