Selective case hardening processes at low temperature

Details Selective case hardening processes at low temperature Selective case hardening processes at low temperature

1998-08-12

2000-12-26

Jones, Deborah

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

148316, 148319, 148213, 148214, B32B 702

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06165597&

ABSTRACT:
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.

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