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US 6,165,597 AGranted
Selective case hardening processes at low temperature
AssigneeSwagelok Company
InventorsPeter C. Williams, Steven V. Marx
Life of this patent
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AssigneeSwagelok Company
InventorsPeter C. Williams, Steven V. Marx
Estimating the term…
A selectively case hardened steel article by low temperature carburization includes a body made of a chromium bearing nickel or ferrous based alloy (for example, stainless steel), a first portion of the body having a first hardness characteristic, and a second portion of the body having a second hardness characteristic; the second portion being less than the entire body and substantially free of carbides. One method for selective case hardening by low temperature carburization includes the steps of applying a carbon blocking mask over surface areas of the article that are not going to be carburized; activating those surface areas that are to be carburized; diffusing carbon into the activated surface areas at a temperature below which carbides readily form; and removing the carbon blocking mask.
An article comprising:
An article comprising:
A method for selectively carburizing a chromium bearing article, the method comprising:
An article made by the following process:
An article comprising a shaped mass of stainless steel alloy defining a first surface area and a second surface area different from the first surface area, the second surface area being carburized, harder than the first surface area and substantially free of carbides.
Dependencies are inferred from the claim text.