Metal treatment – Process of modifying or maintaining internal physical... – Carburizing or nitriding using externally supplied carbon or...
Reexamination Certificate
2006-04-18
2006-04-18
King, Roy (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Carburizing or nitriding using externally supplied carbon or...
C148S223000, C148S233000
Reexamination Certificate
active
07029540
ABSTRACT:
In a first process of a method of gas carburizing, a steel treatment object in a carburizing atmosphere containing carburizing gas is heated to an initial set temperature which is not higher than a peritectic point at which δ iron and a liquid phase transform into γ iron and not less than a eutectic point at which the liquid phase transforms into γ iron and cementite, such that the surface carbon concentration thereof does not exceed a solid solubility limit. In a second process following the first process, the carburizing temperature is gradually decreased from the initial set temperature such that the surface carbon concentration of the treatment object increases without exceeding the solid solubility limit, and such that the carburized depth of the treatment object increases.
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Yu'ev et al., Investigation of High-Temperature Carburizing of Steel in Solid Carburizer with High-Frequency Heating, 1959, Metallovediei Term. Obrabotka Metallov, Aug., pp. 32-38.
Ishibashi Tomoyuki
Tachisato Showa
Tsuji Shohei
Alexander Michael P.
Jordan and Hamburg LLP
King Roy
Koyo Thermo Systems Co., Ltd.
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