Hardened steel components and process of treating the same
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United States of America Patent
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Jan 3, 2006
Grant Date -
Feb 24, 2005
app pub date -
Jul 20, 2002
filing date -
Sep 15, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to components made of steel, more particularly outer joint parts and inner joint parts of constant velocity joints, and to a process of heat treating such components made of steel. The heat treatment operation includes the process stages of nitriding, induction surface layer hardening and tempering, which processes follow one another. As a result of the nitriding operation, the joint parts are provided with a surface layer (15) including nitrides and a diffusion layer (18) positioned thereunderneath. The subsequent induction hardening process causes the diffusion layer (18) to be hardened, so that it comprises good supporting characteristics for supporting the surface layer (15) positioned above same.
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